Download - Sharp Sf 2040 Copier Sm
SERVICE MANUALCODE: 00ZSF2040TM/E
No.2
MODEL SF-2040 MODEL SF-D23 MODEL SF-DM11
[ 1 ] PRODUCT OUTLINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
[ 2 ] PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
[ 3 ] OPTIONS SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
[ 4 ] COMPONENT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
[ 5 ] PROCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
[ 6 ] DEVELOPING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
[ 7 ] PAPER FEED UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
[ 8 ] TRANSPORT/FUSING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
[ 9 ] HIGH VOLTAGE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
[10] OPTICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
[11] ELECTRICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
[12] FUNCTIONS OF PPC COMMUNICATION SYSTEM (OPTION) . . . . . 12-1
CONTENTS
SHARP CORPORATIONThis document has been published to be used forafter sales service only.The contents are subject to change without notice.
Parts marked with "!" is important for maintaining the safety of the set. Be sure to replace these parts with specifiedones for maintaining the safety and performance of the set.
CONTENTS
[ 1 ] PRODUCT OUTLINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1. General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2. Target users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
3. Major features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 (1) Compact body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 (2) Serviceability and functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 (3) High copy performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 (4) Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
4. System outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
[ 2 ] PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1. Basic specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 (1) Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
(2) Copy method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 (3) Kinds of originals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 (4) Copy speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 (5) First copy time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 (6) Warmup time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
(7) Multicopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 (8) Magnification ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 (9) Exposure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2(10) Paper feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2(11) Developing method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
(12) Charge method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3(13) Transfer method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3(14) Separation method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3(15) Fusing method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3(16) Cleaning method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3(17) Light source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
(18) Blanking areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3(19) Automatic duplex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3(20) Paper receiving tray and finishing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3(21) Additional features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4(22) Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
(23) Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4(24) Appearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4(25) Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2. Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
3. Environmental requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
[ 3 ] OPTIONS SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
1. SF-A55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
2. SF-S15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13. SF-S53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14. SF-D23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25. Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
I
[ 4 ] COMPONENT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
1. External view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 2. Operation panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 3. Internal view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4. Clutches, solenoids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 5. Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 6. Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 7. Board list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 8. Duplex copy tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
9. Desk unit (SF-D23) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
[ 5 ] PROCESS (Photocondor drum and cleaning unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1. Basic theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1(1) Image forming process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1(2) Photoconductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
(3) Types of photoconductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1(4) Characteristics of photoconductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
2. SF-2040 basic process and structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3(1) Details of image forming process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
(2) Relationship between the OPC drum and light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4(3) Transition of photoconductor surface potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5(4) Photoconductor drum sensitivity correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5(5) Process control function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
3. Basic structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
[ 6 ] DEVELOPING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
1. Basic theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
(1) Two-component developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1(2) Two-component magnetic brush development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1(3) Developing bias voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
2. Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
3. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
[ 7 ] PAPER FEED UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
1. Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
2. Basic configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
3. Basic operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2(1) Manual paper feed operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2(2) Cassette paper feed operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
[ 8 ] TRANSPORT/FUSING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
2. Basic composition and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 (1) Transport section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 (2) Fusing section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
[ 9 ] HIGH VOLTAGE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
2. Basic composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
(1) Main (charging) corona – High voltage transformer (MHVG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 (2) Transfer corona – High voltage transformer (THVG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 (3) Separation corona – High voltage transformer (SHVG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
II
[10] OPTICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
2. Basic composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 (1) Original table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 (2) Copy lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 (3) Mirror1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 (4) Lens (Fixed focus lens) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 (5) Lens home position sensor (LHPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
(6) No. 4, No. 5 mirror base home position sensor (MBHPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2 (7) Lens base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2 (8) Lens slide shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2 (9) Lens drive wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(10) Mirror base C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
(11) Mirror base C (No. 4, No. 5 mirrors) drive wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(12) Mirror motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(13) Mirror home position sensor (MHPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(14) Mirror base B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(15) Copy lamp unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
(16) Thermal fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(17) Reflector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(18) Exposure adjusting plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(19) Mirror base drive wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(20) Mirror base (No. 4, No. 5) drive motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(21) Lens drive motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
(22) AE sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2(23) Blank lamp operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
3. Basic operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
4. Optical system dirt correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4 (1) Setting the reference value for optical system correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4 (2) Dirt correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
[11] ELECTRICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
1. System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
2. Main circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2 (1) CPU (IC116) HB/570 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
(2) I/O (IC118) TE7750 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-6 (3) RAM (IC119) X28C64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10 (4) Decoder (IC141, IC135) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12 (5) Start/stop control circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13 (6) Heater lamp control circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
(7) Driver circuit (Solenoid, magnetic clutch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15 (8) Stepping motor drive circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15 (9) AE (Auto Exposure) sensor circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16(10) Toner supply motor drive circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
3. Operation circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16<Key circuit> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16 (1) Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16 (2) Key detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16 (3) System configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18
<Display circuit> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19 (1) Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19 (2) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19
III
4. LCD display circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20 (1) Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20 (2) CPU (IC222) µPD78213G-AB8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20
(3) ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-22 (4) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-22 (5) LCD controller (IC305) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-23
5. DC power circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-24
(1) Noise filter circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-24 (2) Rush current limiting circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-24 (3) Rectifying/smoothing circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-25 (4) Invertor circuit (Forward-convertor system) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-25 (5) Rectifying/smoothing circuit in the secondary side (24V, 38V system) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-25
(6) Control circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-26 (7) Overcurrent protection circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-26 (8) Series regulator circuit (–20V system) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-26 (9) Chopper regulator circuit (10V, 5V system) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-26(10) FW system output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-26
(11) Over voltage protection circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-27
6. Desk circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-33 (1) Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-33 (2) Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-35
[12] Function of PPC communication system (Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
1. General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
2. System A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
(1) Functions of System A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
3. System B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-2 (1) Functions and applications of System B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-2
4. Communication interface PWB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-6
IV
[1] PRODUCT OUTLINE
1. General description
The SF-2040 is medium class copier that produces 40 copies perminute. The SF-2040 has all the standard features of medium classcopiers to provide high productivity in offices with improved versatilityfor users.
2. Target users
Average copy volume: 12,000 ~ 15,000 copies/month
3. Major features
(1) Compact bodyUse of a front loading paper cassette.
(2) Serviceability and functionality1 Use of a liquid crystal display with backlight.
2 Department control counter (standard provision, max. 50 depart-ments).
3 Use of key operator codes.
(3) High copy performance1 First copy time: 3.1sec
2 Job speedS → S: 100%, D → D: 70%
(4) OptionsRefer to the system outline below.
4. System outline
Cassette (for replacement)(SF-CM11)
Cassette (SF-IC11)
Reversing automatic document feeder(SF-A55)
Document cover (SF-CV13)
Stand/3000-sheet paper drawer (SF-D23)
20-bin sorter (SF-S15)
1/bin staple sorter (SF-S53)
· Card counter (SF-EA11)· Auditor (SF-EA12)· Counter commander (SF-EA13)· Personal counter (SF-71A/71B)
1 – 1
[2] PRODUCT SPECIFICATIONS
1. Basic specification
(1) Type Desktop
(2) Copy method Dry electrostatic copier
(3) Kinds of originals Sheet, book, three dimensional object
Thickness of original: Maximum 30mm in level with the original cover in use.
Weight of original: Maximum 1.8 kg (4 pounds)
Maximum original size: A3, Ledger
Original alignment: Center and left
Original sensor: Not used. (Provided in RADF.)
Sensing size AB series; A3, B4, A4, A4R, A5
Inch series: Ledger, Legal, Letter, Letter R, Invoice
Option: RADF
Original loading capacity: 50 sheets
Original size: A3 to A5, Ledger ∼ Invoice
Original replace speed: 40 sheets per minute
Weight of original: 35 to 128 g/m2 (14 to 34 lbs)
Mixed paper feed mode: Possible (same width)
(4) Copy speed Actual (1:1) Enlarge (ratio) Reduce (ratio)
A322 sheets per minute
16 sheets per minute(200%)
19 sheets per minute(50%)
B426 sheets per minute
16 sheets per minute(200%)
23 sheets per minute(50%)
A4 (portrait)40 sheets per minute
21 sheets per minute(200%)
33 sheets per minute(50%)
A4 (landscape)31 sheets per minute
18 sheets per minute(200%)
27 sheets per minute(50%)
B5 (portrait)40 sheets per minute
21 sheets per minute(200%)
33 sheets per minute(50%)
B5 (landscape)31 sheets per minute
18 sheets per minute(200%)
27 sheets per minute(50%)
Ledger22 sheets per minute
16 sheets per minute(200%)
19 sheets per minute(50%)
Legal26 sheets per minute
16 sheets per minute(200%)
23 sheets per minute(50%)
Letter (portrait)40 sheets per minute
21 sheets per minute(200%)
33 sheets per minute(50%)
Letter (landscape)32 sheets per minute
18 sheets per minute(200%)
27 sheets per minute(50%)
NOTE: Copy speeds indicated in Enlargement and Reduction modes are the slowest speeds in the respec-tive mode.
(5) First copy time About 3.1 seconds from upper cassette
(6) Warmup time About 100 seconds
(With pre-heat feature)
Misfeed recovery time: 8 seconds, provided the machine is in the standard condition in 60 seconds after opening the door.
(7) Multicopy Maximum multicopy number: 999 sheets
2 – 1
(8) Magnification ratio Fixed ratio AB series: 4R+4E; 200, 141, 122, 115, 100, 86, 81, 70, 50%
Inch series: 4R+4E; 200, 141, 129, 121, 100, 95, 77, 64, 50%
Zooming range: 50 to 200% (1% increments)
(9) Exposure system Slit exposure and moving optical system (fixed original table)
(10) Paper feed Copy size (maximum ~ minimum) AB series: A3 to A6R
Inch series: Ledger ∼ Invoice
Method One cassette + multi-manual feed
Capacity 500 + 50 sheets
* For some areas, 2-tray specifications are also available.
AB series
Paper entry Paper size Paper weight Size selection Side, front
Upper cassette (Option)
B5/B5RA4/A4R/B4/A3
56 ~ 80g/m2 15 ~ 21 lbs.
Selection by way ofguide replacementby the serviceengineer
Front, drawer in thesame body(ADU compatibilityavailable)
Lower cassette A5/B5/B5R A4/A4R/B4/A3
56 ~ 80g/m2 15 ~ 21 lbs.
Selection by way ofguide replacementby the serviceengineer
By way of front,inner cassette
A5: * With the option inner cassette used
Inch series
Paper entry Paper feed size Paper weight Size selection Side, front
Upper cassette(Option)
Letter/Letter R/Legal/Ledger
56 ~ 80g/m2
15 ~ 21 lbs.Selection by way ofguide replacementby the serviceengineer
Front, drawer in thesame body(ADU compatibilityavailable)
Lower cassette Letter/Letter R/Legal/Ledger/Invoice
56 ~ 80g/m2
15 ~ 21 lbs.Selection by way ofguide replacementby the serviceengineer
By way of front,inner cassette
* With the option inner cassette used
Initial setting
JapanOutside
Japan (Inch)Outside
Japan (AB)Remark
Copier upper cassette * B5R — — * When shipping, the domestic(Japan/Oversea agents)paper feed module isattached.
Copier lower cassette A3 Ledger A3
Option cassette module A4 Legal A4 SF-CM11
Multi-stage desk (1st stage)Multi-stage desk (2nd stage)Multi-stage desk (3rd stage)
B4A3—
Letter R——
A4R——
(SF-D22 (Japan only))
LCD desk (1st stage)LCD desk (2nd stage)
——
—Letter
—A4 SF-D23 (Outside Japan only)
Inner cassette A3 Ledger A3 SF-IC11
Manual feed
Paper size: AB series:Inch series:
A3 to A6RLedger ∼ Invoice(Min. width: 100mm, Min. length: 139.7mm)
Paper weight: Multifeed mode:Single feed mode:
56 to 80 g/m2 (15 to 21 Ibs)52 to 128 g/m2 (14 to 34 Ibs)(A4 size or under, if above 105 g/m2 or 28 Ibs)
Kind of paper: Standard, Sharp designated paper, OHPDetection size Inch series:
AB series:Available: Ledger, Legal, Letter, Letter (R), invoiceAvailable: A3, B4, A4, A4R, A5
2 – 2
(11) Developing method Dry, two components magnetic brush method
(12) Charge method (–) DC saw-tooth electrode method
(13) Transfer method (–) DC Corotron method
(14) Separation method AC Corotron method
(15) Fusing method Heat roller method
(16) Cleaning method Blade method
(17) Light source Halogen lamp
(18) Blanking areas Void area: 4mm from the lead edge Image loss: 4mm at maximum during the actual (1:1) copy mode
(19) Automatic duplex Option (SF-DM11) Location Copier upper module slot Size AB series: A3, B4, A4, A4R, B5, B5R, A5
Inch series: Ledger, Legal, Letter, Letter R Capacity 50 sheets (below A4 or letter sizes) or 30 sheets (above B4 or Legal size) Paper weight 56 to 80 g/m2 (15 to 21 Ibs)
(20) Paper receive tray and finishing
Capacity of paper receive tray 250 sheets Finishing With option in use Finisher function Sorted bin capacity Non-sorted bin capacity 20-bin sorter (SF-S15) 50 sheets 100 sheets Fixed bins 21-bin stapler sorter (SF-S53) 50 sheets (50 sheets, if stapler used)
35 sheets (A4 or Less)250 sheets Fixed bins
2 – 3
(21) Additional features Availabilityof feature
APSF
Overseas: Available when RADF is used.
AMSF
Inhibited when mixed paper feed/Overseas: Available when RADFis used.
APS: AMS:
Auto paper selectionAuto magnification ratioselection
Margin shiftF
9mm shift (S → S), withadjustment function
DPCM: Dual page copy mode
DPCMF
Enlarge not permitted.Combination with the duplexfunction allowed.
Edge eraseF
7 to 12mm wide depending onthe size. Equivalent to SF-2022/2027.
TrimmingF
Area input is allowed up to 2areas. (Japan only)
MaskingF
Area input is allowed up to 2areas. (Japan only)
Cover insertionF
Selection of cover/rear orcover/both
Job memory F Recordable up to 9 jobs Auditor F Allowes up to 50 departments. Message display F
Key operator program F
Communication F
Bi-directional. Option I/F PWB(available from service parts.)
Process control F
Auto start F From the energy save mode. Auto tray switching F
Priority selection of tray
Vendor F
Binding margin shift
Width AB series Inch seriesSingle sides to single sided 9mm 1/4"Double sided to single sided 9mm 1/4"Single sided to double sided (front) 9mm 1/4"Single sided to double sided (reverse) 9mm 1/4"Double sided to double sided (front) 9mm 1/4"Double sided to double sided (reverse) 9mm 1/4"
Frame edge erase
AB series Inch seriesSize Deleted width (mm) Size Deleted width (mm)
A3 11.5±3 Ledger 11.5±3B4 9.5±3 Legal 7 ±3A4 11.5±3 Letter 11.5±3A4R 10 ±3 Letter R 7 ±3B5 9.5±3 Invoice 7 ±3B5R 8 ±3
(22) Power supply Voltage:Frequency:
100V, 110V, 120V, 127V, 220V, 240V50/60Hz, universal
(23) Power consumption Maximum power consumption: 1.5KW, maximum, with options used
(24) Appearance WxDxH (mm) 633 x 650 x 567 (at the top of the table glass)633x 650 x 607 (at the top of the original cover)
Occupied area (W x D in mm) 1205 x 650 (with the paper receive tray and manual feed bypass openWeight: Main body About 71.2Kg
Paper feed module: 3.9KgOriginal cover: 1.5Kg
2 – 4
(25) Accessories
Destination Japan SEC SECL SEEG SUK SCA AB agent Inch agentDrum Installed when
shipping.Installed when
shipping.Installed when
shipping.Separately
packed.Separately
packed.Installed when
shipping.Partly packed. Partly packed.
Developer (Black) F × × × × × × ×Toner cartridge F × × × × × × ×Original cover Standard
provisionOption Option Option Option Option Standard provision
Paper exit tray 1*1 F
Original table × F ×Toner collectioncontainer
F (4 pcs.) One is installed when shipping.
Operation manual Japanese Exclusive English English/French GG: GermanBG: None
Exclusive English English English/French/Arabic
Typical example
English/Spanish
Typical exampleDust cover F × F (Part)Zooming ratio table F
ROM language Japanese English English GG: GermanBG: None
English English English/French/Spanish depending onthe destination.
Key sheet Japanese English English/French GG: GermanBG: None
English English English, partlySpanish
English, partlySpanish
SEL = English/French packed together. SEEG (BG) = Treated in a kit.Other printed matters:Delivery/installation report (Japan/SEEG), SCA warranty, Warranty registration (SUK), Maintenance card, Counter contract × 2 (Japan)
*1: Retractable (Japan), Fixed (Outside Japan)
2. ConsumablesSF-2040 supply system (SEC)
No. Name Content Life Product name Package Remark1 Drum OPC drum × 1 160K SF-240DR 102 Developer (Black) Developer (850g) × 10 80K (× 10) SF-240MD1 1 (SF-240ND1) × 10 = SF-240MD13 Toner (Black) Toner cartridge (600g) × 10 16.5K (× 10) SF-240MT1 1 (SF-240NT1) × 10 = SF-240MT14 Upper heat roller kit Upper heat roller
Fusing separation pawl (Upper)Fusing gear
× 1 × 4 × 1
160K SF-222UH 5 For replacement of the fusing separation pawl(80K life) at every 80K, use one which is treatedas a service part.
5 Lower roller kit Lower heat rollerFusing separation pawl (Lower)
× 1 × 2
160K SF-240LH 5 For replacement of the fusing separation pawl(80K life) at every 80K, use one which is treatedas a service part.
6 80K maintenance kit Cleaner bladeCharging plate unitDrum separation pawl unit
× 1 × 1 × 1
80K SF-235KA1 5 Products are shipped from out division. Treatedas parts in SEC.(222BL) × 10 = 222CB For reception of order, SF-222CB is used.(240RU) × 10 = 235CR2 For reception of order, SF-235CR2 is used.
7 Cleaner blade Cleaner blade × 10 80K (× 10) SF-222CB 18 Upper cleaning roller Upper cleaning roller × 1 80K (× 10) SF-240UR 1
9 Lower cleaning roller Lower cleaning roller × 10 80K (× 10) SF-235CR2 1 (235RU) × 10 = 235CR2 For reception of order, SF-235CR2 is used.
10 Staple cartridge Cartridge × 5 5,000 times × 5 SD-LS20 10 Common to the cartridge for SD-2075/3075. (SD-SC20) × 5 = SD-LS20
* For toner collection container (4 pcs./80K), screen grid (80K), charger wire (80K), ozone filter (80K), toner reception seal (160K), and DV seal(160K), use service parts. For charging plate unit (120K) and drum separation pawl unit(120K), service parts are also available.
SF-2040 supply system (SECL)
No. Name Content Life Product name Package Remark1 Drum OPC drum × 1 160K A3SF240DR 102 Developer (Black) Developer (850g) × 10 80K (× 10) A3SF240MD1 1 (SF-240ND1) × 10 = SF-240MD13 Toner (Black) Toner cartridge (600g) × 10 16.5K (× 10) A3SF240MT1 1 (SF-240NT1) × 10 = SF-240MT14 80K maintenance kit Upper cleaning roller
Lower cleaning rollerToner collection containerFusing separation pawl (Upper)Fusing separation pawl (Lower)Screen gridCleaner bladeCharging plate unitDrum separation pawl unit
× 1 × 1 × 4 × 4 × 2 × 1 × 1 × 1 × 1
80K A3SF240KA 1
5 160K maintenance kit Upper heat rollerLower heat rollerToner reception sealDV sealFusing gear
× 1 × 1 × 1 × 1 × 1
160K A3SF240KB 1
6 Staple cartridge Cartridge × 5 5,000 times × 5 A3SDLS20 10 Common to the cartridge for SF-2075.(SD-SC20) x 5 = SD-LS20
2 – 5
SF-2040 supply system (SEEG, SUK)
No. Name Content Life Product name Package Remark1 Drum OPC drum × 1 160K SF-240DM 102 Developer (Black) Developer (850g) × 10 80K (× 10) SF-240LD1 1 (SF-240DV1) × 10 = SF-240LD13 Toner (Black) Toner cartridge (600g) × 10 16.5K (× 10) SF-240LT1 1 (SF-240T1) × 10 = SF-240LT14 80K maintenance
kitUpper cleaning rollerLower cleaning rollerToner collection containerFusing separation pawl (Upper)Fusing separation pawl (Lower)Screen gridCleaner bladeCharging plate unitDrum separation pawl unit
× 1× 1× 4× 4× 2× 1× 1× 1× 1
80K SF-240KA 1 To cope with Europe EAN code, distinguishedfrom A3SF240KA.
5 160Kmaintenance kit
Upper heat rollerLower heat rollerToner reception sealDV sealFusing gear
× 1× 1× 1× 1× 1
160K SF-240KB 1 To cope with Europe EAN code, distinguishedfrom A3SF240KB.
6 Staple cartridge Staple cartridge × 5 5,000 times × 5 SD-LS20 10 Common to the cartridge for SD-2075.(SD-SC20) × 5 = SD-LS20
SF-2040 supply system (SCA, SCNZ, Middle East, Africa)
No. Name Content Life Product name Package Remark1 Drum OPC drum × 1 160K A3SF240DM 102 Developer (Black) Developer (850g) × 10 80K (× 10) A3SF240LD1 1 (SF-240DV1) × 10 = SF-240LD13 Toner (Black) Toner cartridge (600g) × 10 16.5K (× 10) A3SF240LT1 1 (SF-240T1) × 10 = SF-240LT14 80K maintenance kit Upper cleaning roller
Lower cleaning rollerToner collection containerFusing separation pawl (Upper)Fusing separation pawl (Lower)Screen gridCleaner bladeCharging plate unitDrum separation pawl unit
× 1 × 1 × 4 × 4 × 2 × 1 × 1 × 1 × 1
80K A3SF240KA 1
5 160K maintenance kit Upper heat rollerLower heat rollerToner reception sealDV sealFusing gear
× 1 × 1 × 1 × 1 × 1
160K A3SF240KB 1
6 Staple cartridge Cartridge × 5 5,000 times × 5 A3SDLS20 10 Common to the cartridge for SD-2075.(SD-SC20) × 5 = SD-LS20.
SF-2040 supply system (Asia,, Middle/South America)
No. Name Content Life Product name Package Remark1 Drum OPC drum × 1 160K A3SF240DR 102 Developer (Black) Developer (850g) × 10 80K (× 10) A3SF240CD1 1 (SF-240SD1) × 10 = SF-240CD13 Toner (Black) Toner cartridge (600g) × 10 16.5K (× 10) A3SF240CT1 1 (SF-240ST1) × 10 = SF-240CT14 80K maintenance kit Upper cleaning roller
Lower cleaning rollerToner collection containerFusing separation pawl (Upper)Fusing separation pawl (Lower)Screen gridCleaner bladeCharging plate unitDrum separation pawl unit
× 1 × 1 × 4 × 4 × 2 × 1 × 1 × 1 × 1
80K A3SF240KA 1
5 160K maintenance kit Upper heat rollerLower heat rollerToner reception sealDV sealFusing gear
× 1 × 1 × 1 × 1 × 1
160K A3SF240KB 1
6 Staple cartridge Carriage × 5 5,000 times × 5 A3SDLS20 10 Common to the cartridge for SD-2075.(SD-SC20) × 5 = SD-LS20
2 – 6
3. Environmental requirements
Conditions required for proper operation of the machine, as well as assurance of copy quality, the following are requested.
1 Standard conditionsRecommended temperature range at 20 to 25 Centigrade (68 to 77 degrees F) and humidity range at 65 ± 5%RH.
2 Operating conditions
3 Shipping conditions
4 Consumables storage conditions
60%
20%
30˚C 35˚C
80%
Temperature15˚C
Humidity
60%
20%
30˚C 45˚C
90%
Temperature-20˚C
Humidity
20%
40˚C
90%
Temperature-5˚C
Humidity
2 – 7
[3] OPTIONS SPECIFICATIONS
1. SF-A55
Name Reversing automatic document feeder
Original feed system Continuous auto feed
Document feed sequence Bottom take-up feeding (Face-up discharge)
Document transfer drive Belt drive
Orientation of document setting Face up
Document size A3 ∼ B5/W letter ∼ Invoice
Document weightThin paper mode: 35 ∼ 50g/m2 (Japan only)Standard mode: 51 ∼ 128g/m2
Max. No. of documents to beset
Max. 50 sheets (35 - 80g/m2)(30 sheets for A3 or 11" × 17")
Function
Original reverse mechanism (duplex original)SDF/ADF mode selection (selectable with the keyoperator program. Japan only)Original size detection mechanismThin film/standard mode selection (selectable with thekey operator program. Japan only) Mixed paper feedRandom paper feed allowed
Power supply Supplied from the copier
Dimensions 600 (W) × 525 (D) × 170 (H)mm
Weight Approx. 15kg
2. SF-S15Name 20-bin sorter
No. of bins 20 bins
Paper collection Copy face up
Capacity per bin Max. 50 sheets (100 sheets: Top bin)
Allowable paper size/weightfor collating
Max. A3, Min.: B5 (Min. A6 for non-sort)Non-sort: 52 ∼ 128g/m2, Sort/Grouping: 56 ∼ 80g/m2
Power source Supplied from the copier.
Dimensions 500mm (W) × 520mm (D) × 957mm (H)
Weight About 13kg
3. SF-S53Name Staple sorter
No. of bins 20 bins
Paper collection Copy face up
Capacity per bin Max. 50 sheets (250 sheets: Top bin)
Allowable paper size/weightfor collating
Max.: A3, Min.: B5 (Non-sort: Min. A5),Non-sort: 52 ∼ 128g/m2, Sort/staple sort/grouping: 56 ∼ 89g/m2
No. of sheets for stapling 50 sheets (80g/m2)
Power source Supplied from the copier.
Dimensions 475mm (W) × 597mm (D) × 995mm (H)
Weight About 42.1kg
3 – 1
4. SF-D23
Name 2-cassette paper feed desk
Paper size and capacity 550 sheets of A3, B4, A4, or B5 for each cassette
Paper weight 56 ∼ 80g/m2
Paper transport system Roller transport (center reference)
Power source Supplied from the copier.
Dimensions 600mm (W) × 625mm (D) × 451mm (H)
Weight About 32kg
5. SF-DM11Name Duplex module
Paper size A3 ∼ B5
Paper weight 56 ∼ 80g/m2
Capacity A3/B4: 30 sheets, A4/B5: 50 sheets
Power source Supplied from the copier.
Weight About 6kg
6. SF-CM11Cassette module
• Equivalent to the upper cassette of the copier body. The optional 2-cassettepaper feed desk can be attached.
7. SF-IC11Inner cassette
• Paper cassette for replacement of the lower cassette.
8. SF-71A (counter), SF-71B (socket)• Personal counter
9. Other counters
Card-type department counter (SF-EA11)Password-system department counter (SF-EA12)Counter commander (SF-EA13)
10. Desk SF-DS15
9 9 9 9 9
3 – 2
[4] COMPONENT IDENTIFICATION
1. External view
1 Document holder 2 Exit tray 3 Document cover (optional)
4 Operation panel 5 Document glass 6 Paper clip tray
7 Manual feed tray paper guides 8 Manual feed tray 9 Exit area cover
F Power switch GDuplex module or 500-sheet paperdrawer (optional) H Lower paper tray
I Front cover J Toner collecting container cover K Handles
L Side cover
1 2 3 4 5 6 7
9 10 11 12 13 14 15 16
8
4 – 1
M Fusing section N Transport section open/close lever O Photoconductor drum
P Charger Q Toner box R Toner box lever
S Roller rotating knob T Toner collection container
16 17 18 18 20 21
22 23
4 – 2
2. Operation panel
1 COVERS key and indicator 2 ERASE key and indicator 3 MARGIN SHIFT key and indicator
4 DUAL PAGE COPY key and indicator 5 AUTO IMAGE key 6 Message display
7 INFORMATION key and indicator 8 SCROLL DISPLAY keys 9 COPY quantity display
F PROGRAM ( ) key G INTERRUPT key and indicator H LCD contrast control
I SORTER key and indicators J ORIGINAL TO COPY key and indicators K ZOOM keys
L Reduction ( ) key M Enlargement ( ) key N 100% key
O COPY RATIO display P EXPOSURE display Q EXPOSURE key
R AUTO PAPER SELECT display S LIGHT key T DARK key
U Paper size display V TRAY SELECT key W Original size display
X 10-key pad Y AUDIT CLEAR ( ) key Z Clear ( ) key
[ CLEAR ALL ( ) key \ START key and indicator
P
0/ C
CA
COVERS ERASE MARGINSHIFT
DUAL PAGECOPY
SORTER ORIGINAL TO COPY
EVEN NUMBER
ODD NUMBER
(ORIGINALS)
10 0
AUTO IMAGE
ZOOM
100%
SORT
STAPLESORT
GROUP PRE-COUNTORIGINALS
00
11
1
AUTOMANUAL PHOTO
EXPO SU RE LIGHT DARK
AUTO
EXPO SU RE
COPY RATIO
1 0 0 %
00x1718½x110
AUTO PAPERSELECT
READY TO COPY.
ORIGINAL
SCROLL DISPLAY
INFORMATION
TRAY SELECT AUDIT CLEAR
CLEAR ALL
START
0/
CA0 1 2
543
6 8 9
C
P
PROGRAM
LCD contrast control Use the contrast control adjustment to vary thecontrast of the message display to best suit the room lighting conditions.
21 3 4 5 6 7 8 9 10 11 12
13 14 1516
17 1918 20
21 23 24 2522
26 27 2829
30 31 32
INTERRUPT
8¼x11R
8½x11
4 – 3
3. Internal view
1 #2 mirror 2 #3 mirror 3 #1 mirror
4 Copy lamp 5 Lens unit 6 Main corona unit
7 Blank lamps 8 #6 mirror 9 #4 mirror
F #5 mirror G — H Developing tank
I Resist roller J Transfer corona K Drum
L Separation corona M Drum separator pawl N Cleaner unit
O Suction unit P Suction belts Q Upper heat roller
R Lower heat roller S Heater lamp T Lower separator pawl
U Upper separator pawl V Upper cleaning roller W Fuser thermistor
X Delivery select gate Y Manual feed takeup roller Z Manual feed paper feed roller
[ Counter manual feed roller \ Transport roller (upper) ] Transport roller (lower)
Upper paper feed roller _ Upper paper feed reverse roller ‘ Upper paper takeup roller
a Lower paper feed roller b Lower paper feed reverse roller c Lower paper takeup roller
d Lower cleaning roller
3 4 1097
12
13
30
29
31
32
34
35
36
37
38
39
26
25
24
23 22 21 19 18 17 16 1514
21 5 6 8
27
28
20
33
40
4 – 4
4. Clutches, solenoids
Signal name Name Function
1 CPFS1 Upper cassette paper feed solenoid For tensioning takeup roller
2 CPFS2 Lower cassette paper feed solenoid For tensioning takeup roller
3 CPFC1 Upper cassette paper feed clutch For actuating paper feed roller
4 CPFC2 Lower cassette paper feed clutch For actuating paper feed roller
5 MPFS Manual paper feed solenoid For tensioning takeup roller
7 TRCH Transport roller clutch (fast) For actuating transport roller (fast)
8 RRC Resist roller clutch For actuating resist roller
9 PSPS Paper separation solenoid For actuating paper separation solenoid
F DGS Duplex copy gate solenoid For actuating duplex copy gate
10
9
8
7
4
1
2
3
5
4 – 5
5. Sensors
Signal name Type Name Output
1 CSWL Microswitch Cover switch, (left) On when closed
2 POD Transmssive photosensor Paper exit sensor Low when paper passes over
3 P-SW See-saw switch AC power switch —
4 MHPS Transmissive photosensor Mirror home position sensor High when scanner at home postion
5 CSWF Microswitch Cover switch, (front) On when closed
6 LHPS Transmissive photosensor Lens home position sensor Low when lens at home postion
7 PSD Transmissive photosensor Paper separation sensor High when paper passes over
8 OCSW Transmissive photosensor Original cover switch Low when cover is open
9 PPD2 Transmissive photosensor Paper transport sensor Low when paper passes over
F MBHPS Transmissive photosensor Mirror home position sensor Low when mirror at home position
G PPD1 Transmissive photosensor Paper transport sensor-1 Low when paper passes over
H PED1 Transmissive photosensor Manual feed paper sensor Low when paper passes over
I TFD Transmissive photosensor Full waste toner sensor Low when full waste toner detected
J LUD1 Transmissive photosensor Upper cassette liftup sensor Low when lift plate detected
K PED2 Transmissive photosensor Upper cassette paper sensor Low when paper detected
L CSWR Microswitch Doorswitch (right) On when closed
M PID Transmissive photosensor Paper transport sensor High when paper passes over
N LUD2 Transmissive photosensor Lower cassette liftup sensor Low when lift plate detected
O PED3 Transmissive photosensor Lower cassette paper sensor Low when paper detected
P PLS1 Transmissive photosensor Manual tray paper length sensor Low when detected
Q PLS2 Transmissive photosensorManual tray paper length sensor(Inch series only)
Low when detected
1
2
3
4
5 6 7 8 9 10
11
12
13
16
17
18
19
14
15
21
20
4 – 6
6. Motors
Signal name Name Type Function
1 MM Main motor DC, brushless Driving copier and ADU option
2 SM Mirror motor DC, brushless Driving optical system mirror bases A and B
3 LEM Lens motor DC, stepping Driving optical lens
4 MBM #4/5 mirror base motor DC, stepping Driving optical mirror base C
5 TM Toner motor DC, synchronous Supplying toner
6 LUM1 Upper cassette liftup motor DC, brush Lifting upper paper feed cassette baseplate
7 LUM2 Lower cassette liftup motor DC, brush Lifting lower paper feed cassette baseplate
8 CFM Cooling fan motor DC, brushless Cooling optical system
9 VFM Ventilation fan motor DC, brushless Ventilating fuser area
F SFM Suction fan motor DC, brushless Ventilating process unit area aid in paper transport
G DVFM DV fan motor DC, brushless Ventilation around the developing unit
9 12 85 4
3
6
7
10
11
4 – 7
7. Board list
Name Type Function
1 Main PWB Japan/Export Primary control of copier functions
2 Operation PWB Common Display
3 AC PWB Japan/Export, 100V/200V Supplying AC power
4 Blank lamp PWB Common Controlling blank lamps
5 Original sensing light emitting PWB Japan Sensing original size
6 Original sensor light receive PWB Japan Sensing original size
7 AE PWB Common Automatic exposure sensor
8 Cassette paper size PWB Common Sensing cassette paper size
9 Liftup motor PWB Common Driving paper cassette bottom plate liftup
F DC power supply unit 100V/200V series Supplying DC power
G High voltage transformer Common Supplying process unit high voltage and developing bias voltage
H Discharge lamp Common Driving discharge lamps
I Process control VR PWB Common Process sensor sensitivity adjustment
JManual feed paper size sensorPWB
Japan/Export Paper size detection (Japan, portrait only)
K LCD control PWB Japan/Export LCD display drive/control
L LCD invertor PWB Common LCD power invertor circuit
M LCD volume PWB Common LCD light intensity adjustment
9
8
13
4
1716
17512310 1162
15
14
4 – 8
8. Duplex copy tray
Signal name Type Name Output
1 APHPS2 Transimissive photosensor ADU rear plate home position sensor Low when at home position
2 DPPD1 Transimissive photosensor ADU paper transport sensor-1 High when paper passes over
3 APHPS1 Transimissive photosensor ADU alignment plate home position sensor Low when over home position
4 DPPD2 Transimissive photosensor ADU paper transport sensor-2 High when paper detected
5 DTPID Transimissive photosensor ADU tray sensor High when paper detected
6 DPFD Transimissive photosensor ADU paper entry sensor High when paper detected
7 PAM2 DC stepping motor ADU rear plate motor
8 PAM1 DC stepping motor ADU alignment plate motor
9 DPFC Magnetic clutch ADU paper feed clutch
F DRRC Magnetic clutch ADU counter roller clutch
G DDC Magnetic clutch ADU clutch
H ADUPWB Duplex copy tray load driving Diode PWB
6
1 2
387 9 10 5 412
11
4 – 9
9. Desk unit (SF-D23)
11
12 1617
13
18
10
9
8
7
625
4
3
1
23
21
2219
2014
15
4 – 10
A. Sensors and switches
Signal name Name Type Function/operation Contact/output
1 SIZESW Size switch Slide switch Size (A4, B5, Letter) selection —
2 F/LSWFront loadingopen/close switch
Microswitch Desk open/close detection H level when open.
3 DPE2 Empty sensor Reflection type sensorCassette 2 original presencedetection
H level when paper isdetected.
4 DLPD3 Paper pass sensor 2 Reflection type sensorTurns to H level when the paper leadedge is transported to the front ofpickup roller 1.
H level when paper isdetected.
5 DLPD2 Paper pass sensor 1 Reflection type sensorTurns to H level when the paper leadedge is transported to the back ofpickup roller 1.
H level when paper isdetected.
6 DDOP Side open/close sensor Photo interrupter Side cover open/close detection L level when open.
7 DLUD1 Level sensor 1 Photo interrupter Cassette 1 paper height control H level when interrupted.
8 LMS1 Limit sensor 1 Photo interrupterPrevention against excessive heightof cassette 1 paper
H level when interrupted.
9 DPOD1 Resist sensor 1 Photo interrupter Paper pass detection Paper in: L level
F DLPD1 Paper pass sensor 0 Reflection type sensorTurns to H level when the paper leadedge is transported to the front ofseparation roller.
H level when paper isdetected.
G DLUD2 Level sensor 2 Photo interrupter Cassette 2 paper height control H level when interrupted.
H LMS2 Limit sensor 2 Photo interrupterPrevention against excessive heightof cassette 2 paper
H level when interrupted.
I DPOD2 Resist sensor 2 Photo interrupter Paper pass detection Paper in: L level
J E2CLKElevator motor 2 clocksensor
Photo interrupterElevator motor 2 encoder clockdetection
Pulse output
K E1CLKElevator motor 1 clocksensor
Photo interrupterElevator motor 1 encoder clockdetection
Pulse output
B. Electromagnetic clutches
Signal name Name Type Function/operation Contact/output
L P2CL Pick up roller clutch 2 Electromagnetic clutchLinks/releases the transport motordrive and the pick roller 2.
Links the drive whenON.
M P1CL Pick up roller clutch 1 lectromagnetic clutchLinks/releases the transport motordrive and the pick roller 1.
Links the drive whenON.
N BCL Separation clutch Electromagnetic clutchLinks/releases the transport motordrive and the separation roller.
Links the drive whenON.
O RCL Resist clutch Electromagnetic clutchLinks/releases the transport motordrive and the resist roller.
Links the drive whenON.
C. Motors
Signal name Name Type Function/operation
P E1MOT Elevator motor 1 DC motor Drives the lifting mechanism of cassette 1 paper bundle.
Q E2MOT Elevator motor 2 DC motor Drives the lifting mechanism of cassette 2 paper bundle.
R HMOT Transport motor DC brushless motor Drives the whole mechanism of paper transport.
S — Control PWB — —
4 – 11
[5] PROCESS(Photoconductor drum and cleaningunit)
1. Basic theory
With the indirect static copier, a plain paper is used for the copypaper. As a latent static image is formed on the surface of thephotoconductor, the image is then developed into visible (toned)image using the toner. Then the toner is transferred onto the copypaper.The plain paper copier (PPC) has six basic processing steps ofcorona charge, exposure, development, transfer, discharge, andcleaning. The cleaning step prepares the photoconductor surface forrepeated use.
(1) Image forming process
1 Corona charges the photoconductor.
2 The photoconductor is exposed to light to form a static latentimage.
3 Toner is attracted to the static latent image.
4 The toner on the drum is transferred onto the copy paper.
5 The charge remaining on the photoconductor surface (residualcharge) is removed.
6 Toner remaining on the photoconductor (residual toner) isremoved.
(2) PhotoconductorWhile some materials conduct electricity, others do not. Materials,therefore, can be put into three categories of conductor, semiconduc-tor, and insulator.Because these categories are conceptual, distinct classification isdifficult.Generally, the following is applied.Material whose specific resistance is over 103Ωcm is called insulatorand under 10–3Ωcm is called conductor.Those which exist between the two are normally called semiconduc-tor does not.Conductors always have electrical conductivity, while a semiconduc-tor does not. But, it may become a conductor under certain condi-tions.The photoconductor used by the copier is an insulator when notexposed to light, but its electrical resistance abates when exposed tolight. When exposed to light, the photoconductor surface becomesconductive. Material having the property to become conductive inlight (photo conductive phenomenon) is a photoconductor orphotosemiconductor.
(3) Types of photoconductorsThe pricipal materials of a photoconductor are zinc oxide (ZnO),amorphous selenium (amorphous Se), selenium alloy, cadmium sul-fide (CdS), amorphous silicon (amorphous Si), and organic photocon-ductor (OPC).
Described next are structures of the photoconductors we have usedup to now.
Zinc oxide (ZnO) master
Cadmium sulfide (CdS) drum
Organic photoconductor (OPC) master and drum
Selenium (Se) drum
1
2
3
4
5
6
Charging
Exposure
Development
Transfer
Discharge
Cleaning
Photoconductor
HV
CTL
CGL
Base
Dark area Dark areaLight
Theory of photoconduction
Amorphous selenium(amorphousSe)
Selenium alloy
Zinc oxide(ZnO)
Cadmium sulfide(CdS)
Amorphous silicon(amorphous Si)
Organic photoconductor(OPC)Organic photoconductor
Inorganic photoconductor
Photoconductive layer (zinc oxide layer)Intermediate layerPaperBack coating paper
Base paper
PET layerMicro space layerPhotoconductive layer (CdS layer)Aluminum layer
Charge transfer layerCharge generation layer
Opticalconductivelayer(OPC layer)
Aluminum layer
(selenium layer)Photoconductive layer
Aluminum layer
5 – 1
Zn0 OPC CdS Se
Photoconductorsensitivity 4 3 2 1
Photoconductorstrength 4 3 2 1
Photoconductorlife
Several hundredcycles
Several tenthousand cycles
Several tenthousand cycles
Several hundredthousand cycles
Photoconductor characteristics1 > 2 > 3 > 4
Characteristics of organic photoconductors
• Permits a variety of structures (drum, sheet, belt)
• Higher insulation in dark area (charge acceptability and retentivity)
• Permits a variety of molecular structure (allows a variety ofmolecular design)
• Light weight
• Stable against humidity and temperature
• Safety for environment (non-pollution, unrestrained disposal)
• Not strong in anti-wear property
• Not strong against light and ozone.
(4) Characteristics of photoconductorMentioned next are the general characteristics important to use forthe photoconductive material.
1. Photo-sensitivity 2. Spectrum characteristics3. Acceptor potential 4. Charge retentivity5. Residual potential 6. Fatigue
[Photo-sensitivity]This is dependent on the attenuation speed of the potential when thephotoconductor is exposed to light.
[Spectrum characteristics]Wave length of the light differs by the kind of the photoconductor.
Relationship between color and wave lengthLight having wave length of 380mm through 780mm can be recog-nized by human eyes, which is called visible light. Wave lengthshorter than that is called ultraviolet light and the longer than that iscalled infrared light. Figure below shows the relationship between thewave length of light and color.
[Acceptor potential]The resistance in the dark area of the photoconductor decreases as the electric field increases among layers.As the electric field is formed to a higher value as the photoconductoris charged, the resistance in the related layer decreases and the rateof charge retained in the photoconductor is restricted. The potential ofthe photoconductor in this instance is called acceptor potential whichis the important factor to determine the potential contrast. To avoidgiving electrical distortion in the photoconductor, charge is normallymade to a level slightly lower than the acceptor potential.
[Charge retentivity]The time the static latent image is held by the photoconductordepends on the speed at which the potential decreases in the darkarea. For this, measure the time the photoconductor potential abatesto a half of the starting value in the dark area. This charge retentivitymay cause a problem when the time from the exposure to thedevelopment is long. But, it may not be a problem with the machinewhere a series of operations from charge, exposure, and develop-ment are automated and time between processes is shorter.
[Residual potential]When the charged photoconductor is exposed to light, the potentialabruptly diminishes at first, then begins decay relatively slowly. Thepotential of the photoconductor where slow decay starts is calledresidual potential. Because a less residual potential produces a largepotential contrast, low residual charge is preferable.The value of the residual potential affects largely the development ofgradual tone.
[Fatigue]If charge and exposure are repeated, the phenomenon calledphotoconductor fatigue occurs. In other words, it appears as an in-crease of the decay speed of the photoconductor potential or adecrease in the charge retentivity.
Now, we have learned about the characteristics required for chargingof the photoconductor. If charge is repeated from the corona unit inthe actual operation, the corona wire is likely to be contaminated withdust, stain, and scattered toner, causing uneven corona charge. Toavoid this, the corona wire needs to be cleaned well.
1.0
400
0.8
0.6
0.4
0.2
500 600 700 800
Se:Te
OPC
Amorphous silicon
Sp
ect
rum
se
nsi
tivity
(re
lativ
e v
alu
e)
WavelengthSpectrum sensitivity
350 400 450 500 550 600 650 700 750 800
Blue green
Vio
let
Blu
e
Gre
en
Yel
low
Ora
ng
e
Red InfraredUltraviolet
5 – 2
2. SF-2040 basic process andstructure
• The Scorotron method is used to evenly charge the photoconduc-tor surface to the given potential in the charge process. Thecorona wire regularly used is now replaced with a new coronacharge mechanism that employs the 0.1mm thick stainless steelsaw tooth plate, in order to suppress ozone generated when theoxide molecule in air is ionized.
• Considering the service efficiency, the process separationmechanism is adopted.
• To prevent high voltage leakage by the loose corona charge unit, aone-touch stopper mechanism is adopted.
(1) Details of image forming process
STEP 1. Charging(grid voltage refer page 8-1)The main corona discharges negative corona to give negative char-ges to the OPC drum surface evenly. The surface potential of the OPC drum is controlled by the screengrid voltage to maintain at the potential equal to the grid voltage.
• When the drum surface voltage is lower than the screen grid volt-age, electric charges from the main corona pass through thescreen grid to reach the drum surface and charge it until the drumsurface voltage becomes equal to the grid voltage.
• When the drum surface voltage reaches almost the same level asthe grid voltage, electric charges from the main corona flowthrough the electrode of the screen grid to the high voltage unitgrid voltage output circuit, thus maintaining the drum surface volt-age at the same level as the grid voltage.
STEP 2. Exposure (Copy lamp, mirror, lens)The optical image of an original is projected through the mirror andlens onto the OPC drum surface by the copy lamp. The resistance ofthe OPC layer reduces in the bright area (light area on the original) todischarge negative charge, forming an electrostatic latent image onthe drum surface. In reduction copy, the non-image area of the image is discharged bythe BL (blank lamp) before exposure.
STEP 3. Development (Bias –300V)The electrostatic latent image on the drum surface is formed into avisible image by the toner. This copier employs the two-componentmagnetic brush development system, where a bias voltage of –300Vis applied to the carrier (MG roller) and the toner is charged positivelyby friction with the rotating carrier.
STEP 4. TransferThe visible image on the drum surface is transferred on to the copypaper. A negative charge of the transfer corona is applied to the rearsurface of the copy paper to transfer the toner from the drum surfaceto the copy paper.
Screen grid
Grid voltageoutput section
Main coronaoutput section
High voltageunit
Exposure
Exposure(Copy lamp)
OPC layer
Pigment layer
Aluminum(Drum)
Dark area Light area Dark area Light area
N
S
S
N
N
-300V
Carrier
Toner
Toner
Copy paper
Paper guide
High voltage unit
5 – 3
STEP 5. SeparationThough the copy paper and the drum are both negatively chargedafter transfer, the negative potential on the drum is higher than thaton the copy paper, generating an attraction force between the drumand the copy paper. To remove the attraction force, AC corona isapplied to the copy paper by the separation corona to raise thepotential on the copy paper to the same level as the drum surfacepotential. The attraction force is eliminated and the copy paper isseparated from the drum. If the paper is not separated from the drum,the separation pawl works to separate it mechanically.
STEP 6. CleaningResidual toner on the drum is collected by the cleaning blade.
STEP 7. DischargeThe electrical resistance of the OPC layer is reduced by radiationfrom the discharge lamp over the drum to remove residual charges.
Photo modeThe photo mode is provided to make clear half-tone copy of the photooriginals. In the photo mode, the grid voltage and the copy lamp voltage arelowered than in the standard copy mode (the copy density of theblack background is lowered) to provide half tone graduations of thecopy.
(2) Relationship between the OPC drum and lightThe light exposed is absorbed by the charge carrier generation layer(CGL) to generate the charge carrier and moves towards the chargecarrier transport layer (CLT). The carrier reached CTL then movestowards the drum surface through CTL to neutralize the surfacecharge.
AC4KV
Separationpawl
Copy paper
Separation coronaoutput section
High voltage unit
Cleaner blade
Residualtoner
Discharge lamp
(Dark)
Copy density
(Light)
Gradation is increased toprovide larger expressionwidth of half tone.
Original density (Dark)
Normal copy mode
Photo mode(The copy density ofblack background isdecreased.)
CTL
CGL
Grid
5 – 4
(3) Transition of photoconductor surface potential
(4) Photoconductor drum sensitivity correctionIn this machine, fall in sensitivity due to long use of the photoconduc-tor drum is corrected by the copy lamp light intensity to preventagainst considerable change in copy quality. The photoconductor drum sensitivity fall correction is performed asfollows:
DLBLCharge Exposure Develop Transfer Separate Clean
Dark area
Developing bias voltage
Light area
Residual potential
-850V
-300V
Cleaner
OPC drum
Develop
(NEW)
CTL
CGL
(USED)
CTL
CGL
Sim46
CLV
5K0 10K 15K 20K 25K 70K 75K 80K
CL(V) + (0.33V x 2)CLV + 2 counts
(Sim46-01)
Change the thickness of the carrier transport layer (CTL).By the developper.By the cleaner blade.
Drum counter
5 – 5
(5) Process control function
[Summary]The process control function detects the density of the standard tonerimage formed on the photoconductor, the density of the initial imageand controls the charging grid voltage so that the same level as theinitial image density is provided. That is, the process conditions are established and the high voltageoutput and exposure level are controlled to stabilize the toner density.
Process control
1 Toner patch images are formed on the photoconductor surfaceunder the three process conditions (MC grid bias voltage). At the first process control, a toner parch image is formed with thereference grid voltage –630V as the center and ±50V. At thesecond or later process control, the MC grid bias voltage deter-mined at the former process control is used as the center, and atoner patch is formed under the process condition of ±50V to thecenter value.
2 Measure the three toner patch images formed in the above andthe drum surface with the process density sensor to obtain therelations.
BVS: Sensor detection level on the photoconductor drum surfacePVS: Sensor detection level with the toner patch image
Obtain the above two levels from the calculation formula and recordthem as the reference values.
A. STD BA: Reference level when detecting the drum surface→ STD BA = BTS x 20
B. STD PA: Reference level when detecting the toner patch image→ STD PA = PTS x 20In the density correction, the process conditions are determinedso that the ratio of the reference levels
STD PASTD BA
set in the above
may be maintained at constant.
3 Obtain the MC grid bias voltage from the reference level ratio.
In this machine, the absolute value of the output of the densitysensor is not directly used for control calculation, but the ratio ofthe sensor output value (BA) on the drum surface and the sensoroutput (PA) of the toner patch image is used for control calcula-tion. Though, therefore the light quantity of the reflection type sensor isvaried by dirt or deterioration, the ratio (PA/PB) will not be affectedby change in light quantity to provide stable control. The grid voltage value where the same density level as the refer-ence level is obtained and displayed as GB ADJUST by SIM 44-9.
4 When the MC grid bias voltage is corrected by the process con-trol, the corresponding light quantity is calculated to control thecopy lamp. To correct the MC grid voltage, the delta value of the sensitivitylevel when the initially recorded reference grid voltage is –630Vand the MC grid voltage where the same density is obtained inprocess control is fed back to the MC grid voltage of each mode.
Process control timingIn this machine, the process control is performed in the followingtiming:
1 When the main switch is turned on. (When warming up with 45sec or more READY time)
2 At every specified copy quantity (First copy after 1,000 copies)Judged by the total counter.The correction is reset by Simulation 25-2.
3 After the specified time after turning on the main switch. (Firstcopy after 2 hours)
Main control PWBProcess densitysensor PWB
High voltage PWB
(Light quantity correction)
CPU densityjudgement
I/O MC gridoutput selection
Density detectionlevel setting(VR2)
MC grid biasoutput (densitycorrection) in each mode
R
F
472V
BV
PV
Bias
440V
408V
123
123
1IDPAT =PV 1 x 20
2IDPAT =PV 2 x 20
3IDPAT =PV 3 x 20
1IDBAS =BV 1 x 20
2IDBAS =BV 2 x 20
3IDBAS =BV 3 x 20
Drum 1/2 rotation 2/2 rotation 3/2 rotations
SurfaceTonerimage Surface
Tonerimage Surface
Tonerimage
1
2
3
Surface
1=ID PAT1ID BAS1
2=ID PAT2ID BAS2
3=ID PAT3ID BAS3
PABA
-660-610-560
3
2
1
MC grid bias voltage
STD PASTD BA
GB PAT
5 – 6
Drum markingIn this machine, a toner patch image is formed in the same positionon the photoconductor drum surface to improve the accuracy of theprocess control. A marking is provided on the drum and the marking is sensed beforeforming a toner patch image. If the marking is not sensed, themachine stops its operation and indicates "F2-32" trouble.There are two drum markings (3 × 8 m).
3. Basic structure
Photoconductor drum: The 65mmφ ground plate of the OPCdrum is on the rear frame side of the drumunit so that it contacts the drum locatorpin.
Blank lamp: The non-image area is exposed by thelight from the blank lamp to erase thepositive potential outside the drum CTL.Use of the latch simplifies the lamp posi-tion adjustment.
Discharge lamp: Eight bulbs cast light over the drum sur-face to erase the positive potential in CTL.A ventilation hole provided in the drumframe releases heat from bulbs.
Cleaning mechanism: The cleaning blade removes the tonerremaining on the drum surface. The bladealways rests on the drum surface.
Main corona: The saw tooth corona charge method isused. Use of the screen grid maintains theeven charge potential over the photocon-ductor surface.
Enforced separation mechanism:
Using two separation pawl, the copypaper stuck over the drum surface isforced to separate from the drum surface.
Waste toner transport mechanism:
To enhance the toner transport efficiency,a transport pipe is used and toner backupis avoided by setting the waste tonertransport path downward.
R
F
5 – 7
[6] DEVELOPING UNIT
1. Basic theory
(1) Two-component developerThe developer consists of toner and carrier, which is usually calleddeveloper.The carrier is a medium that applies toner to the static latent imageon the photoconductor.As the carrier is stirred with the toner, the friction charges it to positiveor negative.Because the developer fatigues, this affects its characteristics anddeteriorates the copy quality, it needs to be replaced after a givenperiod.
(2) Two-component magnetic brush developmentA rotary, non-magnetic sleeve is provided over the magnet roller andis rotated.Carrier forms the magnetic brush on the sleeve surface by magneticforce to make toner be attracted onto the latent electrostatic image onthe photoconductor.
(3) Developing bias voltageWhen the photoconductor is exposed to light, the surface potential(voltage) of the photoconductor is not removed completely andremains as a residual potential. Therefore, the toner stuck on thephotoconductor by the residual potential stains a white area of thecopy background.To prevent this, a voltage of the same charge on the photoconductorsurface which is higher than the charged potential is added to themagnetic roller to avoid the toner from remaining on the photocon-ductor surface.
2. Structure
No. Name
1 Developer mangetic rollerMagnetic brush is formedwith the carrier by themagnetic force.
2 Developer doctor plateA plate employed to limit theheight of the magneticbrush.
3 Developer stirring rollerCarrier within the developingunit is stirred to distributethe toner evenly.
4 Developer transport rollerThe toner fed from the tonerhopper is supplied to thestirring unit.
5 Toner density sensorUsed to detect the density ofthe toner contained in thedeveloper.
3. Operation
When the power is turned on, the machine goes into the warmupmode and the main motor starts to run in 1.5 minutes.The developer unit is driven by the main motor via the main drive unit.Ratio of the carrier and the toner within the developing unit ismonitored by the toner density sensor as a change in the magnetictransmission rate. The voltage is sent to the analog input line of theCPU on the main board.In the CPU, the input voltage level is monitored and the main motorand the toner motor are controlled until the optimum density is ob-tained. Then the toner is supplied, transported, and stirred.
++
+++
+
MG roller
Residual potential < DV BIAS
TonerCarrier
DV BIAS-300V
Developing bias voltage
1 3
2 4
5
6 – 1
[7] PAPER FEED UNIT
1. Outline
The front load method and the foldable multicopy table are providedto save space. The machine is equipped with two 500-sheet casset-tes and a manual feed multicopy table that may feed up to 50 sheets.Use of a desk unit option and a cassette module allows to expand thesystem.
Standard setting
2. Basic configuration
SF-DM11
SF-2040SF-IC11
SF-CM11
SF-D23
1
2
3
4
5
6
7
8
21 20 19 18
17
16
15
14
13
12
11
10
9
No. Name
1 Resist roller Synchronizes the copy paper with image by controlling the resist roller clutch (RRC).
2(PPD2)Paper transport sensor
For control of the paper transport roller clutch (TRC).
3(LUD1)Lift upper limit sensor
For control of the upper cassette liftup motor; a high on this line stops the motor.
4(PED1)Paper presence sensor
For detection of paper in the upper cassette; a low on this line shows that paper is present.
5 Takeup roller The upper cassette paper takeup roller descends at the moment the paper feed solenoid turns on.
6(LUD2)Lift upper limit sensor
For control of the lower cassette liftup motor; a high on this line stops the motor.
7(PED2)Paper presence sensor
For detection of paper in the lower cassette; a low on this line shows that paper is present.
8 Takeup roller The lower cassette paper takeup roller descends at the moment the paper feed solenoid turns on.
9 Counter paper feed roller For prevention of double feed paper using the lower paper reversion roller.
F Paper feed roller Lower cassette paper feed roller with an internal one-way clutch.
G(PID)Paper entry sensor
Entry of paper from the lower cassette is sensed to turn off the paper feed solenoid.
H Paper transport roller For transport of paper from the lower paper cassette.
I Paper reversion roller For prevention of double feed paper using the upper paper reversion roller.
J Paper feed roller Upper cassette paper feed roller with an internal one-way clutch.
K Paper transport roller Paper from the cassette is transported to the resist roller.
L(TFD)Full waste toner sensor
A low on this line shows the full toner condition.
M(PEDMFT)Paper presence sensor
For detection of manual feed paper; a low on this line shows the paper is present.
N Takeup roller Manual feed paper takeup roller
O Paper feed roller Manual paper feed roller with one-way clutch
P Paper reversion roller For prevention of double feed paper using the lower paper reversion roller.
Q(PPD1)Paper transport sensor
For detection of paper from cassette and manual paper feed.
7 – 1
3. Basic operation
(1) Manual paper feed operation1 When the manual feed is at rest, the manual paper feed solenoid
(MPFS) is off and the manual feed stopper is closed with thetakeup roller in the up position. Latches and clutches are in theposition shown in the figure below.
2 When the PRINT switch is pressed, the manual paper feedsolenoid (MPFS) turns active, the manual feed latch A disengagesfrom the manual feed clutch sleeve A, the manual feed roller andthe manual feed takeup roller start rotating. Then the manual feedstopper opens and the manual feed takeup roller comes in closecontact with the copy paper to start paper feed.
3 When the pawl C of the manual feed clutch sleeve B7 is caught bythe manual feed latch B7, the manual feed stopper goes downand the manual feed takeup roller goes up. At this moment, thetransport roller is rotating.
4 After the lead edge of the copy paper is detected by PPD2, themanual feed solenoid turns off after 0.2 second. Here, the pawl Bof the clutch sleeve B7 is caught by the manual feed latch B7.This produces a buckle in the paper between the resist roller andthe paper feed roller.
A B
Manual feedtakeup roller
Transfer paper
Manual feed stopper
Manual paper feed roller
Manual feedfriction plate
Manual feedclutch sleeve A
Manual feedlatch A
Manual feedsolenoid
Manual feedclutch sleeve
Manual feed latch
AB
ON
C
Manual feed stopper
Manual paper feed roller
Manual feedtakeup roller
Manual feedclutch sleeve
Manual feedclutch sleeve A
Manual feedlatch A
Manual feedsolenoid
Manual feed latch
AB
ON
Manual feed takeup rollerManual feed stopper
Manual paperfeed roller
Manual feedclutch sleeve A
Manual feedlatch A
Manual feedsolenoid
Manual feedclutch sleeve
Manual feed latch
Transfer paper
OFF
AB
C
Manual feed takeup roller
Manual feed stopper
Manual paperfeed roller
Manual feed clutch sleeve A
Manual feed latch A
Manual feed solenoid
Manual feedclutch sleeve
Manual feed latch
Transfer paper
Resist roller
7 – 2
5 In synchronization with rotation of the resist roller, the manual feedsolenoid turns on for 0.08 seconds and the manual paper feedroller rotates. A misfeed caused by a lack of seizure of the resistroller is prevented. Here, the manual takeup roller is up.
6 The manual feed solenoid turns off, the pawl A of the manual feedclutch sleeve B7 is caught by the manual feed latch B7, themanual feed operation terminates. The copy paper is then sent tothe transfer unit by way of the resist roller.
(2) Cassette paper feed operationFor the upper, lower, and desk cassettes, paper is fed in the samemanner.
The operations of the lower cassette are described below.
1 Liftup actionWhen the power is turned on to the copier, the main circuit in-itiates to check every sensor.The liftup motor is turned on or off according to the state of thepaper presence sensor (PED) and the liftup sensor, and it be-comes ready to feed paper.
2 Paper feed operationWhen the PRINT switch is pressed, the cassette paper feedsolenoid (CPFS2) and the cassette paper feed clutch (CPFC2)turn on. As the solenoid turns on, the paper takeup roller is forceddown to make contact with paper.As the clutch turns on, the paper feed roller and the takeup rollerstart to rotate to pick up paper.The paper picked up passes over the paper entry sensor (PID)and sent to the paper transport roller area.The paper transport roller is driven with two kinds of clutches.Paper transport from the paper feed block to the resist roller isperformed with the high speed clutch.The paper obstructed by the resist roller synchronizes with theoptical unit and is transported to the process unit. Because thepaper is transported at the same speed as the process unit rota-tion, the drive changes from the high speed clutch to the lowspeed clutch.
AB
ON
Manual feed takeup roller
Manual feed stopperResist roller
Transfer paper
Manual feedclutch sleeve
Manual feed latch
Manual paperfeed roller
Manual feed clutch sleeve A
Manual feed latch A
Manual feed solenoid
OFF
AB
Manual feed clutch sleeve
Manual feed clutch sleeve A
Manual feed latch A
Manual feed solenoidManual feed latch
MM
SFM
CFM
DL
THV
MHV
BL
SHV
PPD2
PSD
POD
MPFS
RRC
200
RESIST
200
Power ON
CPFS2 turns on and the take-up rollerpresses the copy paper to start paper feed.
YES
NO
LUM ON
PED/LUD"ON"
7 – 3
Lower cassette paper feed timing chart
500 ms ON when A3 (11"x17") paper feeding with the lower cassette.
[8] TRANSPORT/FUSING SECTION
1. General
This machine allows transport of paper of max. A3 (11" x 17") andmin. A5 (8 1/2" x 5 1/2"). After images are transferred on the paper, the paper is separatedfrom the drum and transported to the fuser section by rotations of theresist roller and the transport belt. The paper separation sensor (PSD) is provided at the transport sec-tion. This sensor (PSD) is used to sense paper separation and fordrive timing of the duplex gate solenoid (DGS) after fusing.
2. Basic composition and functions
(1) Transport section1 Transport belts (2pcs)
The transport belts are provided with notches to hold paper rearends.
2 Separation sensor (PSD)This is a transmission type sensor, and attached to the main bodychassis.
3 Suction fan motor and ozone filerOzone generated in the process high voltage section is absorbedthrough the filter.
(2) Fusing section1 Upper heat roller
The upper heat roller is teflon-coated. (Reversed crown shape)
2 Lower heat rollerA silicone rubber roller is used. (Crown shape)
3 Separation pawlThe upper heat roller is equipped with four pawls which are tefloncoated to reduce friction. the lower heat roller is equipped with two pawls.
4 Upper/lower separation functionThe upper and lower heat roller sections are separated by rotatingoperations with the transport roller as a fulcrum, providing betterserviceability.
5 Drive system divisionThe fuser unit is rotated by the main drive unit. In case of manualrotation of the fuser unit to remove paper jam, however, excessiveloads may be applied to the gears. To prevent against this, thespring clutch is provided in the main drive gears.
[9] HIGH VOLTAGE SECTION
1. General
There are three kinds of coronas; the main corona, the transfercorona, and the separation corona. The main corona employs thescorotron system, where the drum surface is evenly charged withnegative charges controlled by the screen grid between the coronaand the drum. The transfer corona is used to transfer toner imagesfrom the drum to the copy paper. A high, negative voltage is appliedto the rear side of the paper. The separation corona applies ACcorona to the copy paper to eliminate potential difference with thedrum to allow separation of the paper.
2. Basic composition
(1) Main (charging) corona – High voltage transformer (MHVG)
(Electrode sheet front-rear balance difference: max. 8µA)
Grid voltage Developing bias voltage
Standard mode –860V±10V
Photo mode –610V±10V –300V
TSM mode –755V±10V
(2) Transfer corona – High voltage transformer (THVG)
–57±4µA (Electrode sheet front-rear balance difference: max. 5µA)
(3) Separation corona – High voltage transformer (SHVG)
AC4KV ±0.1KV
MM
SFM
CFM
DL
THV
MHV
BL
SHV
PPD1
PPD2
PSD
POD
TRCH
RRC
PID
CPFS2
CPFC2
PSPS
0.22
RESISTSim 51-2
Paper
Transport belt
Feeding direction
8 – 1
[10] OPTICAL SECTION
1. General
This machine is composed of the fixed focus lens and six mirrors.The lens and the 4, 5 mirrors are moved by the stepping motor topositions according to the magnification ratio of reduction, normal, orenlargement copy. Magnification ratio is changed from 50% to 200%in 151 steps of 1%. The six mirrors realize a compact design. The slitexposure system with the moving light source is employed. Copyimage density can be controlled by changing the light quantity of thecopy lamp.
The automatic exposure sensor is provided to sense density of theoriginal and the copy lamp light quantity is controlled by the maincircuit to provide even copy image.
2. Basic composition
18 4 3 11 2 1 20 19 14 7 12
10 5 17 6
9 16 8 13
1 Copy lamp 2 Reflector 3 No. 1 mirror
4 No. 2 mirror 5 No. 3 mirror 6 Lens
7 No. 4 mirror 8 No. 5 mirror 9 No. 6 mirror
F Mirror base B unit G Copy lamp unit H Mirror base C unit
I Lens drive motor J No. 4, No. 5 mirror base drive motor K Mirror motor
L Mirror base home position sensor M Lens home position sensor N Mirror home position sensor
O Automatic exposure sensor P OC switch
(1) Original tableThe original table is fixed, and an original is set to the left center.
(2) Copy lamp100V system 85V 275W200V system 170V 310W
(3) MirrorSix mirrors are used. No. 1 mirror is attached to lamp unit, mirror base A, No. 2 and No. 3mirrors to mirror base B, No. 4 and No. 5 mirrors to mirror base C. Mirror bases A and B are scanned when copying. Mirror base C isused to change the distance between an original and the photocon-ductor in reduction or enlargement copy.
(4) Lens (Fixed focus lens)• Construction: 1 group 3 lenses
• Brightness: F8.5
• Focal distance: 195mm ±1%
(5) Lens home position sensor (LHPS)This sensor is used to sense lens position. The output signal ofthis sensor serves as the basic signal to control the copy magnifica-tion ratio.
10 – 1
(6) No. 4, No. 5 mirror base home position sensor (MBHPS)
This sensor is used to sense mirror base C (No. 4, No. 5 mirrors).The output of this sensor serves as the basic signal to control thecopy magnification ratio.
(7) Lens baseThe lenses are mounted to this base, which is moved in the paperfeed direction for reduction copy and in the paper exit direction forenlargement copy.
(8) Lens slide shaftThis shaft is used to control optical axis of the lenses in reduction orenlargement copy. The lenses follow on the slide base shaft.
(9) Lens drive wireThe lens drive wire is used to move the lens base.
(10) Mirror base CNo. 4 and No. 5 mirrors are attached to mirror base C. Mirror base Cis moved by the mirror base drive motor to adjust the distance be-tween an original and the photoconductor in reduction or enlargementcopy.
(11) Mirror base C (No. 4, No. 5 mirrors) drive wireThis wire is used to move mirror base C (No. 4, No. 5 mirrors).
(12) Mirror motorThe mirror motor is a DC servo motor used to move mirror base Aand mirror base B. Its rotation is adjusted according to each mag-nification ratio.
(13) Mirror home position sensor (MHPS)This is a transmission type sensor used to sense the home position ofmirror base A.
(14) Mirror base BNo. 2 and No. 3 mirrors are attached to mirror base B, which ismoved by the mirror motor.
(15) Copy lamp unitThis is composed of No. 1 mirror, the thermal fuse, the copy lamp,the exposure adjusting plate, and the reflector, and is scanned by themirror motor.
(16) Thermal fuseThe thermal fuse is provided at the reflector to prevent against abnor-mal temperature rise in the optical system. In case of an abnormaltemperature rise, it turns off the power source of the copy lamp.100V system 110 °C200V system 110 °C
(17) ReflectorLight from the copy lamp is reflected by the reflector onto an original.
(18) Exposure adjusting plateThere are three exposure adjusting plates attached to mirror base Ato adjust exposure balance between the front and the rear sides.
(19) Mirror base drive wireThe mirror motor power is transmitted to mirror base A and mirrorbase B to scan the mirror base by means of this wire.
(20) Mirror base (No. 4, No. 5) drive motorThis is a stepping motor used to drive mirror base C.
(21) Lens drive motorThis is a stepping motor used to change lens positions.
(22) AE sensorThe AE sensor senses the original density by the magnitude of lightreflected from the original. The center area of about 100mm wide inthe mirror base scan direction is the light measuring area. The elements are photo diodes.
(23) Blank lamp operation When a reduction image is copied on a large size paper in reductioncopy, the outside area becomes black background. In another copy mode also, electric charges remain on the outer areaof the original image and toner is attracted to the area. To dischargethis, light is radiated on the drum by the blank lamp to prevent againstadhesion of toner in the outer area of the image. The lead edge void is formed by the drum discharge system with theblank lamp light. The void width can be adjusted by the diagnosticfunction.
10 – 2
3. Basic operation
(Relation between an original, the lenses, and images in each mag-nification ratio)Normal copy: The distance between the original surface set on the
table glass and the lens is adjusted to the distancebetween the lens and the exposure surface of thephotoconductor to make a normal copy.
Enlargement: The lens approaches nearer the original comparedfrom the normal copy and the distance between theoriginal surface and the lens is shortened. No. 4 and No. 5 mirrors go far from the lens and thedistance between the lens and the exposure surfaceof the photoconductor becomes greater. The distance between the original and the exposuresurface of the photoconductor becomes greater thanin the normal copy.
Reduction: The lens approaches nearer the photoconductor com-pared from the normal copy, and the distance be-tween the original surface and the lens becomesgreater. The distance between the lens and the exposure sur-face of the photoconductor becomes shorter. No. 4, 5 mirror and the mirror base go far from thelens. The distance between the original and the exposuresurface of the photoconductor becomes greater thanin normal copy.
(Copy lamp control for each copy density mode)
° Manual density copy mode
Perform simulation 46-01 to determine the copy lamp application vol-tages (Vcl) in EX1 and EX5. When the copy lamp application voltages in EX1.0 and EX5.0 aredetermined, the voltage difference between them is divided into nine. The application voltage of the copy lamp at each exposure level isdetermined by changing ON time duty of the copy lamp ON controlsignal.
° Photo density copy modeThe control method is the same as in the manual density copy mode.The image density is controlled by decreasing the grid bias voltage ofthe charging corona. To reproduce half tone image, however, ONtime duty of the copy lamp ON signal is made shorter than in themanual density copy mode. (The application voltage is reduced.)
Mirror base scan speed
Copy paperfeed direction
Lens and mirror positionsare changed to adjust themagnification ratio.
Mirror scan speed is changed to adjust the magnification ratio.
Mirror scan speed Drum rotating speed < Mirror scan speed
Enlargement
Original
Lens and mirrorpositions arechanged to adjustthe magnificationratio.
Reduction
80
70
60
50
(V)
EX1 2 3 4 EX5
(MAX. 83V)
(MIN. 50.3V)
VCL(Copy lampapplicationvoltage)
10 – 3
4. Optical system dirt correction
In the SF-2040, exposure density is corrected by changing the copylamp light quantity depending on dirt in the optical system (the copylamp unit, No. 1 mirror, No. 2 mirror, No. 3 mirror).The optical system dirt correction is performed as follows:
(1) Setting the reference value for optical system correction.
1 Clean the optical system at every maintenance.
2 Perform Simulation 46-1.(The previous data are cleared.)
3 After completion of Simulation 46-1, when performing the firstmirror initialization, measure light quantity of the copy lamp.
Obtain the average value from the four measurement values anduse the average value as the reference value for correction.
(2) Dirt correction
50ms
300ms
CL
Light quantity measurement
Reference plate (Glass holder) Table glass
Automatic exposuresensor
CPU reference valuesetting
100 200 300 400 79.8K 80K
CLV + (0.33 x 2)
Sim46
CLV
Reference plate (Glass holder) Table glass
Copy lamp light quantity "UP"
Automatic exposuresensor
CPUReference value
> Measured valueCorrection data output
Reference plate (Glass holder) Table glass
Copy lamp light quantity "UP"
Automatic exposuresensor
CPUReference value
> Measured valueCorrection data output
10 – 4
[11] ELECTRICAL SECTION
1. System block diagram
LUM
1
LUM
2
CS
WL
PS
D
PS
PS
DG
S
PO
D
PW
S
PLS
1,2
PE
D1
MP
FS
PE
D2
LUD
1
UC
SS
CP
FS
1,C
PF
C1
PE
D3
LUD
2
UC
SS
PID
PP
D1
PP
D2
CP
FS
2,C
PF
C2
RR
C
TR
C
DL
PW
B
1 7
VF
M
SH
V
GR
ID
TH
V
MC
12
31
1
CF
MM
HP
SC
SW
F
3
MIR
M
3 1 31 33333 1 1 31 3 31 31 1 13
13
BL
PW
BA
ES
PW
B
23
32
13
1
32
33
1
3 1
LMM
BM
MB
HP
ST
FD
OC
SW
3
13
13
131
1 7
TM
21
3
+38V
1 2
4V2
10V
14
10V
23
5V
15
-20
V6
FW
DM
PW
B
ID P
WB
VR
PW
B
2
MM
SF
M
+38
V
+38V
45
6
31
HL
CL
LHP
S
CS
WR
2
Mirr
or m
otor
PW
B
13
VR
PW
B
2
LCD
unit
Ope
ratio
nP
WB
Inve
rte
run
it
LCD
con
trol
PW
BO
RS
ligh
tre
cept
ion
OR
S li
ght
emitt
ing
PW
B
Aud
itor
Per
sona
lco
unte
r
AD
F/R
AD
Fco
ntro
l PW
B
Des
k un
itco
ntro
l PW
B
Sor
ter
cont
rol
PW
B
Deh
umid
ifier
hea
ter
Mai
n sw
itch
AC
pow
erso
urce
AC
circ
uit
PW
B
DV
uni
t
Mai
n c
ircu
it P
WB
CP
U,I/
O m
em
ory,
driv
er
AD
Uun
it
DC
pow
erci
rcui
t
Hig
h vo
ltage
circ
uit
DV
FAN
A
A
11 – 1
2. Main circuit(1) CPU (IC116) HB/570
1 GeneralThe CPU controls the loads of the main body, performs data trans-mission and reception through the connected optional controllers andthe serial data line, and controls the whole system.
2 FeaturesThe HB/570 is equipped with the freely programmable ISP (IntelligentSub Processor). It is a single-chip micro-processor which performshigh-speed execution of exclusive commands to strengthen theroutine functions such as the timer function and the serial com-munication function.
Major features
° ISP (Built-in EPROM)
° SCI (Serial communication interface)
° PWM timer (Pulse wide modulation)
° A/D convertor
° Watch-dog timer
° I/O port
° 2KByte memory RAM
3 Pin arrangement
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
P90/PW3/IOF10
P91/PW4/IOF11
P92/PW5/IOF12
P93/IOF13
P94/IOF14
P95/IOF15
P96.IOF16
P97/IOF17
VCC
P100/IOF20
P101/IOF21
P102/IOF22
P103/IOF23
P104/IOF24
P105/IOF25
P106/IOF26
P107/IOF27
P80/IOF00
P81/IOF01
P82/IOF02
P83/IOF03
P84/IOF04
P85/IOF05
P86/IOF06
VSS
P120/D8
P121/D9
AVCC
STBY
MD2
MD1
MD0
P17/LWR
WR/HWR
RD
AS
VCC
XTAL
EXTAL
VSS
NMI
RES
P10/Φ
P11/BACK
P12/BREQ
P13/WAIT
P53/A19
P52/A18
P51/A17
P50/A16
A15
A14
A13
A12
A11
P87/IOF07
2930
3132
3334
3536
3738
3940
4142
4344
4546
4748
4950
5152
5354
55 56
P12
2/D
10
P12
3/D
11
P12
4/D
12
P12
5/D
13
P12
6/D
14
P12
7/D
15
VS
S
D0
D1
D2
D3
D4
D5
D6
D7
VC
C A0
A1
A2
A3
A4
A5
A6
A7
VS
S A8
A9
A10
112111
110109
108107
106105
104103
102101
10099
9897
9695
9493
9291
9089
8887
86 85
P11
7
P11
6
P11
5
P11
4
P11
3
P11
2
P11
1
P11
0
VS
S
P65
/SC
K
P64
/RX
D
P63
/TX
D
P62
/PW
2
P61
/PW
1
P60
/PW
0
P54
/IOR
0
P56
/E
P57
/AD
TR
G
VS
S
AV
SS
P77
/AN
7
P76
/AN
6
P75
/AN
5
P74
/AN
4
P73
/AN
3
P72
/AN
2
P71
/AN
1
P70
/AN
0
H8/570
HD
6475708FJA
PA
N
11 – 2
4 Internal block diagram
P10
/ΦP
11/B
AC
K
P12
/BR
EQ
P13
/WA
IT
P17
/LW
R
AS
RD
WR
/HW
R
D0
D1
D2
D3
D4
D5
D6
D7
A0A1
A2
A3A4
A5
A6
A7A8
A9
A10
A11A12
A13
A14
EXTAL
XTAL
NMI
RES
STBY
MD0
MD1MD2
Vcc
Vss
P127/D15
P126/D14P125/D13P124/D12P123/D11P122/D10
P121/D9P120/D8
P117
P116P115
P114P113P112
P111P110
P10
7/IO
F27
P10
6/IO
F26
P10
5/IO
F25
P10
4/IO
F24
P10
3/IO
F23
P10
2/IO
F22
P10
1/IO
F21
P10
0/IO
F20
P97
/IOF
17
P96
/IOF
16P
95/IO
F15
P94
/IOF
14
P93
/IOF
13P
92/IO
F12
/PW
5
P91
/IOF
11/P
W4
P90
/IOF
10/P
W3
P87
/IOF
07
P86
/IOF
06P
85/IO
F05
P84
/IOF
04
P83
/IOF
03P
82/IO
F02
P81
/IOF
01P
80/IO
F00
P50/A16P51/A17
P52/A18
P53/A19
P54/IRQ0P56/E
P57/ADTRG
P60/PW0
P61/PW1
P62/PW2
P63/TXDP64/RXDP65/SCK
P70/AN0P71/AN1
P72/AN2
P73/AN3
P74/AN4P75/AN5
P76/AN6
P77/AN7
AVcc
AVss
3
6
A14
H8/500CPU
ISP
RAM 2K byte
Port 1 Bus control Data buffer
Clock oscillator
Wait statecontroller
Add
ress
buf
fer
Watch dogtimer
Interruptioncontroller
Data transfercontroller
RWMtimer
Por
t 5P
ort 6
Por
t 7
Port 8Port 9Port 10
Serialcommunicationinterface
10bitA/D convertor
Por
t 12
Por
t 11
Dat
a bu
s (L
ower
)
Dat
a bu
s (U
pper
)
Add
ress
bus
11 – 3
5 CPU (IC116) pin signal
Pin No. Port Signal name I/O H/L Specifications
1 P90 LEMT0 OUT H Lens motor drive signal A
2 P91 LEMT1 OUT H Lens motor drive signal B
3 P92 LEMT2 OUT H Lens motor drive signal -A
4 P93 LEMT3 OUT H Lens motor drive signal -B
5 P94 CLK OUT H Clock signal for data output to BL.OPPWB
6 P95 DATA OUT H Serial data output to BL.OPPWB
7 P96 BSPWM OUT H High voltage unit bias level control pulse
8 P97 CLPWM OUT H Copy lamp light quantity control pulse
9 VCC +5V2 Power source (5V)
10 P100 FWS IN H Power frequency detection signal (AC waveform zero cross timing)
11 P101 KEY IN H Operation PWB key input signal (Serial data)
12 P102 TP2071 (NC)
13 P103 RE IN H Pulse signal generated by mirror motor rotation
14 P104 MHPS IN L Optical unit home position sense signal
15 P105 TP2068 (NC)
16 P106 R-TXD OUT L Serial data output to RIC
17 P107 R-RXD IN L Serial data input from RIC
18 P80 PAM1-0 OUT H ADU side plate motor drive signal A
19 P81 PAM1-1 OUT H ADU side plate motor drive signal B
20 P82 PAM1-2 OUT H ADU side plate motor drive signal -A
21 P83 PAM1-3 OUT H ADU side plate motor drive signal -B
22 P84 MBMT0 OUT H Mirror base motor drive signal A
23 P85 MBMT1 OUT H Mirror base motor drive signal B
24 P86 MBMT2 OUT H Mirror base motor drive signal -A
25 P87 MBMT3 OUT H Mirror base motor drive signal -B
26 VSS VSS Power source (GND)
27 P120 PAM2-0 OUT H ADU rear plate motor drive signal A
28 P121 PAM2-1 OUT H ADU rear plate motor drive signal B
29 P122 PAM2-2 OUT H ADU rear plate motor drive signal -A
30 P123 PAM2-3 OUT H ADU rear plate motor drive signal -B
31 P124 RRC OUT H Resist roller clutch drive signal
32 P125 DCH OUT H CPU reset signal
33 P126 TRCL OUT H Transport roller clutch (low speed)
34 P127 TRCH OUT H Transport roller clutch (high speed)
35 VSS VSS Power source (GND)
36 D0 D0 Data signal
37 D1 D1 Data signal
38 D2 D2 Data signal
39 D3 D3 Data signal
40 D4 D4 Data signal
41 D5 D5 Data signal
42 D6 D6 Data signal
43 D7 D7 Data signal
44 VCC VCC Power source (5V)
45 A0 A0 Address signal
46 A1 A1 Address signal
47 A2 A2 Address signal
48 A3 A3 Address signal
49 A4 A4 Address signal
50 A5 A5 Address signal
51 A6 A6 Address signal
52 A7 A7 Address signal
53 VSS VSS Power source (GND)
54 A8 A8 Address signal
55 A9 A9 Address signal
56 A10 A10 Address signal
11 – 4
Pin No. Port Signal name I/O H/L Specifications
57 A11 A11 Address signal
58 A12 A12 Address signal
59 A13 A13 Address signal
60 A14 A14 Address signal
61 A15 A15 Address signal
62 A16 A16 Address signal
63 A17 A17 Address signal
64 A18 A18 Address signal
65 A19 A19 Address signal (Not used)
66 P13 R-DSR IN Data set ready signal from RIC
67 P12 APHPS2 IN L ADU rear plate sense (L at HP) (Sensor pin, H at HP)
68 P11 APHPS1 IN L ADU width sense (L at HP) (Sensor pin, H at HP)
70 RES RESET IN L Reset state at LOW (0V).
71 NMI POFA IN H Low with stable power voltage.
72 VSS GND Power source (GND)
73 EXTAL EXTAL IN Clock (8MHz)
74 XTAL XTAL IN Clock (8MHz)
75 VCC VCC Power source (5V)
76 AS TP2074 (NC)
77 RD RD OUT L ROM, RAM, I/O data read signal
78 WR WR OUT L ROM. RAM, I/O data write signal
79 P17 U2 IN U2 trouble cancel short signal
80 MD0 VSS IN L Operation mode, control signal
81 MD1 MD1 IN H Operation mode, control signal
82 MD2 MD2 IN H Operation mode, control signal
83 STBY STBY IN H Hardware standby mode signal
84 AVCC AVCC IN IN A/D convertor reference voltage
85 P70 AN0 IN Analog input signal (AE sensor)
86 P71 AN1 IN Analog input signal (Thermistor)
87 P72 AN2 IN Analog input signal (Manual feed paper width sense)
88 P73 AN3 IN Analog input signal (Toner concentration sensor)
89 P74 AN4 IN Analog input signal (NC)
90 P75 AN5 IN Analog input signal (Process control sensor)
91 P76 AN6 IN Analog input signal (Manual feed paper length sense)
92 P77 AN7 IN Analog input signal (Process control sensor)
93 AVSS AVSS A/D convertor ground
94 VSS VSS Power source (GND)
95 P57 SMDIR OUT L Mirror motor feed return select signal
96 P56 TP2072 (NC)
97 P54 TP2075 (NC)
98 P60 SMPWM OUT H Mirror motor speed control pulse
99 P61 MBHPS IN L No. 4/5 mirror home position sense signal (L at HP)
100 P62 LHPS IN L Lens home position sense signal (L at HP)
101 P63 TXD OUT L Serial data output to each slave CPU
102 P64 RXD IN L Serial data input from each slave CPU
103 P65 TP2078 (NC)
104 VSS VSS Power source (GND)
105 P110 IN0 IN L Switch detection strobe signal
106 P111 IN1 IN L Switch detection strobe signal
107 P112 IN2 IN Switch detection strobe signal
108 P113 IN3 IN Switch detection strobe signal
109 P114 IN4 IN Switch detection strobe signal
110 P115 IN5 IN Switch detection strobe signal
111 P116 PPD1 IN Paper transport sensor 1
112 P117 PPD2 IN Paper transport sensor 2
11 – 5
(2) I/O (IC118) TE7750
1 GeneralThe I/O converts output data of the CPU into the control signals.The TE7750 is a versatile-use interface element. Nine sets (8 bit) of I/O ports are provided to set I/O operations ofparallel data by the program or the hardware.
2 Features8 bit parallel I/O ports (x 9 ports)
3 Pin arrangement
90
120
91
1 30
31
60
61
TELTE7750Top View
Pin I/O Pin name
1 — VSS
2 — NC
3 I MS
4 I/O P10
5 I/O P11
6 I/O P12
7 I/O P13
8 I/O P14
9 I/O P15
10 I/O P16
11 I/O P17
12 I/O P40
13 I/O P41
14 — VDD
15 — VSS
16 I/O P42
17 I/O P43
18 I/O P44
19 I/O P45
20 I/O P46
21 I/O P47
22 I/O P20
23 I/O P21
24 I/O P22
25 I/O P23
26 I/O P24
27 I/O P25
28 — NC
29 — NC
30 — NC
Pin I/O Pin name
31 — VSS
32 — NC
33 I/O P26
34 I/O P27
35 I/O P50
36 I/O P51
37 I/O P52
38 I/O P53
39 I/O P54
40 I/O P55
41 I/O P56
42 I/O P57
43 I/O P30
44 — VDD
45 — VSS
46 I/O P31
47 I/O P32
48 I/O P33
49 I/O P34
50 I/O P35
51 I/O P36
52 I/O P37
53 I/O P70
54 I/O P71
55 I/O P72
56 I/O P73
57 — NC
58 — NC
59 — NC
60 P74
Pin I/O Pin name
61 — VSS
62 — NC
63 I/O P75
64 I/O P76
65 I/O P77
66 I/O P60
67 I/O P61
68 I/O P62
69 I/O P63
70 I/O P64
71 I/O P65
72 I/O P66
73 I/O P67
74 — VDD
75 — VSS
76 I/O P90
77 I/O P91
78 I/O P92
79 I/O P93
80 I/O P80
81 I/O P81
82 I/O P82
83 I/O P83
84 I/O P84
85 I/O P85
86 I/O P86
87 I/O P87
88 — NC
89 — NC
90 — NC
Pin I/O Pin name
91 — VSS
92 — NC
93 I/O P94
94 I/O P95
95 I/O P96
96 I/O P97
97 I RW0
98 I RW1
99 I RW2
100 I/O D0
101 I/O D1
102 I/O D2
103 I/O D3
104 – VDD
105 – VSS
106 I/O D4
107 I/O D5
108 I/O D6
109 I/O D7
110 I A0
111 I A1
112 I A2
113 I A3
114 I RD
115 I WR
116 I CS
117 — NC
118 — NC
119 — NC
120 I RESET
11 – 6
4 Internal block diagram
DataBus
Buffer
AddressDecoder
CWR(3)
ModeSelector
ControlLogic
CWR(0)
CWR
I/OPort(1)
I/OPort
I/OPort
I/OPort
I/OPortCWR
(2)
I/OPort
I/OPort
I/OPort
I/OPort
(8)
(9)
(1)(2)
(3)
(4)
(5)
(6)
(7)
8
D0~D7
A0
A1
A2
A3
Reset
CS
RD
WR
R/W0
R/W1
R/W2
MS
P10~P17
P20~P23
P24~P27
P30~P37
P40~P47
P50~P53
P54~P57
P60~P67
P70~P77
P80P81P82P83P84P85P86P87
P90~P97
11 – 7
5 I/O (IC114) pin signal
Pin No. Port Signal name I/O H/L Specifications1 VSS VSS Power source (GND)2 NC TP2052 (NC)3 MS +5V2 IN H Mode select (Hard mode (2) at H)4 P10 LATCH-OP OUT H Latch signal of output data to the operation PWB5 P11 LATCH-BL OUT H Latch signal of output data to BL PWB6 P12 ASEL0 OUT TXD, DTR output select signal7 P13 ASEL1 OUT TXD, DTR output select signal8 P14 NC OUT (NC)9 P15 BEO-BL OUT H BL PWB output driver ON/OFF control signal10 P16 NC (NC)11 P17 NC (NC)12 P40 AEG0 OUT H AE GAIN select signal13 P41 AEG1 OUT H AE GAIN select signal14 VDD VDD Power source (5V)15 VSS VSS Power source (GND)16 P42 AEG2 OUT H AE GAIN select signal17 P43 SRES OUT H Slave PWB reset signal (Not used)18 P44 TMa OUT H Toner supply motor drive signal19 P45 TMb OUT H Toner supply motor drive signal20 P46 CV-START OUT H Coin vendor start signal21 P47 CV-CA OUT H Coin vendor clear signal22 P20 DTR OUT Data transmit ready signal23 P21 DPFC OUT H Duplex tray paper feed clutch drive signal24 P22 CLE OUT H Copy lamp enable signal (ON at H)25 P23 AUDCL OUT H Auditor time-out clear26 P24 AUDCP OUT H Auditor during copy cycle27 P25 PNC OUT H Personal counter control signal28 NC TP2048 (NC)29 NC TP2047 (NC)30 NC TP2050 (NC)31 VSS GND Power source (GND)32 NC TP2051 (NC)33 P26 LED0 OUT H Original size sense LED lighting signal34 P27 LED1 OUT H Original size sense LED lighting signal35 P50 MHV OUT H Main corona high voltage output control signal36 P51 THV OUT H Transfer corona high voltage output control signal37 P52 SHV OUT H Separation corona high voltage output control signal38 P53 EX1 OUT H Reserved.39 P54 GR SEL0 OUT H Grid bias control signal 040 P55 GR SEL1 OUT H Grid bias control signal 141 P56 DDC OUT H Duplex drive connection clutch42 P57 PR OUT H Power relay control signal43 P30 VFM1 OUT H Ventilation fan motor control signal 144 VDD VDD Power source (5V)45 VSS VSS Power source (GND)46 P31 VFM2 OUT H Ventilation fan motor control signal 247 P32 DRRC OUT H Duplex reversion roller clutch48 P33 MM OUT H Main motor control signal49 P34 SFM OUT H Suction fan motor control signal50 P35 MPFS OUT H Manual paper feed solenoid control signal51 P36 CPFS1 OUT H Upper cassette paper feed solenoid control signal52 P37 CPFS2 OUT H Lower cassette paper feed solenoid control signal53 P70 IDSEL2 OUT H Image density sensor control signal54 P71 CPFC1 OUT H Upper cassette paper feed clutch control signal55 P72 CPFC2 OUT H Lower cassette paper feed clutch control signal56 P73 MMPR OUT H Main motor power relay control signal57 NC TP2045 (NC)58 NC TP2044 (NC)59 NC TP2046 (NC)60 P74 HL OUT H Heater lamp control signal61 VSS VSS Power source (GND)
11 – 8
Pin No. Port Signal name I/O H/L Specifications62 NC TP2039 (NC)63 P75 LUM1 OUT H Lift up motor control signal (upper stage)64 P76 LUM2 OUT H Lift up motor control signal (lower stage)65 P77 PSPS OUT H Paper separation solenoid control signal66 P60 W0 OUT H Switch sense strobe signal67 P61 W1 OUT H Switch sense strobe signal68 P62 W2 OUT H Switch sense strobe signal69 P63 W3 OUT H Switch sense strobe signal70 P64 W4 OUT H Switch sense strobe signal71 P65 W5 OUT H Switch sense strobe signal72 P66 W6 OUT H Switch sense strobe signal73 NC TP2038 (NC)74 VDD VDD Power source (5V)75 VSS VSS Power source (GND)76 P90 DGS OUT H Duplex gate solenoid control signal77 P91 CFM OUT H Cooling fan motor control signal78 P92 SSEL OUT OP.BL select signal79 P93 CV-COUNT OUT H Coin vendor count signal80 P80 IDSEL1 OUT H Image density sensor control signal81 P81 R-RTS OUT RTS for RIC82 P82 R-DTR OUT DTR for RIC83 P83 SME OUT L Mirror motor enable signal (ON at L)84 P84 DMSEL0 OUT H Drum marking sensor control signal85 P85 DMSEL1 OUT H Drum marking sensor control signal86 P86 DMSEL2 OUT H Drum marking sensor control signal87 P87 IDSEL0 OUT H Image density sensor control signal88 NC TP2033 (NC)89 NC TP2032 (NC)90 NC TP33 (NC)91 VSS GND Power source (GND)92 NC TP2040 (NC)93 P94 PDSEL0 OUT L Original sense photo transistor select signal94 P95 PDSEL1 OUT L Original sense photo transistor select signal95 P96 PDSEL2 OUT L Original sense photo transistor select signal96 P97 DL OUT H Discharge lamp control signal97 PW0 GND (L) IN L Read/write set signal98 RW1 GND (L) IN L Read/write set signal99 RW2 GND (L) IN L Read/write set signal100 D0 D0 IN Data signal101 D1 D1 IN Data signal102 D2 D2 IN Data signal103 D3 D3 IN Data signal104 VDD VDD Power source (5V)105 VSS VSS Power source (GND)106 D4 D4 IN Data signal107 D5 D5 IN Data signal108 D6 D6 IN Data signal109 D7 D7 IN Data signal110 A0 A0 IN Address signal111 A1 A1 IN Address signal112 A2 A2 IN Address signal113 A3 A4 IN Address signal114 RD RD IN L Data read signal115 WR WR IN L Data write signal116 CS I/O CS IN L Chip select signal117 NC TP2043 (NC)118 NC TP2041 (NC)119 NC TP2042 (NC)120 RESET RESET IN L Reset signal. Reset to initial state at LOW level
11 – 9
(3) RAM (IC119) X28C64
1 GeneralThe RAM stores various set data necessary for the SF-2040 systemoperations and counter data such as paper jam causes or troublecodes (without batteries). After turning on/off the power, data aretransmitted between the RAM and the main CPU. The X28C64 is an 8KByte EEPROM (Electrically Erasable PROM)and operates on a single power of 5V.
2 FeaturesLow power CMOS operating current: Max. 60mAAll memory write time: Average 0.625sec
3 Pin arrangement
4 Internal block diagram
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NC
A13
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
VSS
VCC
WE
NC
A8
A9
A11
OE
A10
CE
I/O7
I/O6
I/O5
I/O4I/O3
AT28C64B
PLASTICCERDIP
FLAT PACK
XBUFFERSLATCHES
ANDDECODER
YBUFFERSLATCHES
ANDDECODER
CONTROLLOGICAND
TIMING
65.536-BITE²PROMARRAY
I/O BUFFERSAND LATCHES
A0~A12ADDRESSINPUTS
CE
OE
WE
VCC
VSS
I/O0~I/O7DATA INPUTS/OUTPUTS
5 RAM (IC115) pin signal
Pin No. IN/OUT Signal name Function
1 — NC
2 IN A12 Address signal
3(
10IN
A7(
A0
Address signal
11(
13IN/OUT
I/O0(
I/O2
Data signal
14 — GND GND (0V)
15(
19IN/OUT
I/O3(
I/O7
Data signal
20 IN CS RAM chip select signal. RAM is selected at LOW (0V).
21 IN A10 Address signal
22 IN RD Read signal. RAM data are read into CPU at LOW level.
23 IN A11 Address signal
24 IN A9 Address signal
25 IN A8 Address signal
26 IN NC
27 IN WR Write signal. Data are written from CPU to RAM at LOW level (0V).
28 — 5V Power source
11 – 10
6 Backup data list
Item Set program No. Content
Counter 21-01——————————
Maintenance preset counter settingMaintenance counterJAM memory (Max. 50 pcs.)Total JAM counterTotal counterDeveloper counterStaple counterRADF (ADF) counterADU counterDeveloper correction counterDrum correction counter
Simulation set value 25-0225-03 26-01 26-0326-0626-07 26-0826-0941-02
4344-0144-11 46-01
4748-0148-0250-0150-02 51-02 52-0152-0252-03
* 53-01 ** 53-02 ** 53-03 ** 53-04 ** 53-05 *
Automatic developer adjustment valueSetting of toner control ignoring time when warming upOption settingCounter mode setting/Timer automatic clear settingDestination settingDrum sensitivity settingLens focus settingNo. 4/5 mirror characteristics settingOriginal size sensor adjustmentFusing temperature settingCorrection mode settingEnters the copy aging mode to allow the following operation and settingExposure level adjustmentAE sensor characteristics measurementFront/rear magnification ratio adjustmentPaper transport direction magnification ratio adjustmentLead edge image position adjustmentLead edge image position adjustmentResist quantity adjustmentADU alignment plate adjustment value settingADU rear plate adjustment value settingADU drive clutch OFF time settingRADF stop position adjustment (normal paper, one side)RADF stop position adjustment (normal paper, both sides)RADF stop position adjustment (thin paper)RADF resist sensor adjustmentRADF reverse sensor adjustment
* 53-01, 02, 03, 04, 05 The data in the memory of RADF main control PWB.
11 – 11
(4) Decoder (IC141, IC135)
1 GeneralIC141 and IC135 are two sets of independent binary-quaternarydecoders.
IC141:
Enable Select Output
GND A17 A18 ROMCS I/OCS EEPROMCS SRAMCS
LLLL
LHLH
LLHH
LHHH
HLHH
HHLH
HHHL
Chip select signal is outputted with address data (A17, 18).
IC135:
Enable Select Output
DTR ASEL0 ASEL1 A-DTR D-DTR S-DTR O-DTR
LLLL
LHLH
LLHH
LHHH
HLHH
HHLH
HHHL
Data receive enable signal from the slave CPU is outputted byaddress selector (ASEL0, 1).
A-DTR: Data send enable from RADF/ADF
D-DTR: Data send enable from the desk unit
S-DTR: Data send enable from the sorter unit
O-DTR: Data send enable from the operation PWB unit
IC141:
Enable Select Output
CLK SSEL GND CLK-BL
LL
LH
LL
HL
With select signal (SSEL), clock signal is outputted to the driver ICin the blank lamp PWB.
IC135:
Enable Select Output
TXD ASEL0 ASEL1 A-TXD D-TXD S-TXD O-TXD
LLLL
LHLH
LLHH
LHHH
HLHH
HHLH
HHHL
With address selector (ASEL0, 1), the destination of the CPUoutput data is selected and the data are outputted.
2 Internal logic diagram
3 Pin connection
4 OperationsWhen this is used as a decoder, if input 1A and 1B are specified with2-bit binary codes, one of the outputs corresponding to the valuebecomes LOW and the other three outputs become HIGH. At thattime, enable input E (15 pin, 1 pin) is kept at LOW. When E (15 pin, 1pin) is HIGh, all outputs become HIGH regardless of DA and DB.
1G 1B 1A 1Y0 1Y1 1Y2 1Y3
H X X H H H H
L L L L H H H
L H L H H L H
L H H H H H L
Note 1: X: HIGH or LOW.
(4) 1Y0
(5) 1Y1
(6) 1Y2
(7) 1Y3
(1)
(2)
(3)1A
1B
1GENABLE
SELECTINPUT
(12) 2Y0
(11) 2Y1
(10) 2Y2
(9) 2Y3
(15)
(14)
(13)
2A
2B
2GENABLE
SELECTINPUT
DATAOUTPUTS
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
G A B Y0 Y1 Y2Y3
GA B Y0 Y1 Y2 Y3
VCC 2G 2A 2B 2Y0 2Y1 2Y2 2Y3
1G 1A 1B 1Y0 1Y1 1Y2 1Y3 GND
SELECT DATA OUTPUTENABLE
SELECT DATA OUTPUTENABLE
11 – 12
(5) Start/stop control circuit
1 GeneralThe circuit senses ON/OFF state of the power source to controlstart/stop of the circuits. The DC power PWB supplies power voltages (VB=+24V, VC=+10V,VD1=5V, VD2=5V). After the power voltage reaches the specified level, the circuit opera-tion is started. Before the power voltage falls below the specifiedlevel, the circuit operation is stopped, preventing against malfunc-tions.
2 OperationA POFA generating circuit (Power voltage sense circuit)
This circuit senses ON/OFF of the power source and the powervoltage. The DC power voltage is unstable immediately after turn-ing on the power, or when the AC input voltage is abnormally low,or in the transition period after turning off the power. When the DC voltage falls below the specified level, the circuitsdo not work properly. Especially when the power is turned on/off,data transmission is performed between the EEPROM (IC119)and the CPU (IC116). If, in this case, VD (+5V) power voltage iflow, data transmission is not performed properly. To protect against this malfunction, on/off of the power is sensedby this circuit and informed to the CPU so that the CPU starts datatransmission with the RAM and the operations of each circuit andthat it completes data transmission with the EEPROM and stopsthe operations of each circuit before the DC power voltage fallsbelow the machine operation disable level. (Data transmissionbetween the CPU and the EEPROM is allowed if only VD2 (+5V2)does not fall.)Signal POFA is used to inform the CPU of on/off of the power andthe DC power voltage state. POFA is driven HIGH to turn off thepower when the DC power voltage becomes higher than thespecified level. POFA is driven LOW just before the DC powervoltage becomes low (0V).
9
814 11
1013
5
6 7
5
4 2
3
12
7
6 1
POFA1-6C
TP126
+5V2
R1212.2KJ
R1245.6KJ
+10V1
TP72
D1171SS133
D1161SS133
+24V
R12391KJ
+10V1
TP74C18222000PF
+10V1
R13739KJ
R134910J
L-8FW
Q108DTC114YK
R140
150J
TP75IC136C
NJM2901
R128
300J
C1231uF
ZD106HZ6A1
+5V2
C1293.3uF
D115
1SS133
R12536KJ
IC136D
NJM2901
3
12
-DCH3-3C
Q107DTC114YK
R13139KJ
C1771000PF
R130
300J +5V2
C17622000PF
+10V1
IC142B
NJM2903
R16822KJ
R16710KJ
+5V2
R1262.2KJ
R17110KJ
R17010KJ
TP73
TP31
FWS1-8C
R127
10KJ
R1291.5KF
R132
15KF
IC136A
NJM2901
R1331.5KF
R1361.5KF
R13910KJ
R138
20KJ
C1250.01uF
C1811000PF
IC136B
NJM2901
C1303.3uF
R13510KJ
-RESET1-6C,1-3D
C17922000PF
11 – 13
B RESET generating circuitRESET signal is formed with the power voltage sense signal(POFA) and the data transmission complete signal (DCH) out-putted from the CPU, and is used to operate each circuit in thestable range of the DC power voltage. RESET signal is set (operation enabled) when POFA becomesHIGH (+5V), and is reset (operation stopped) when DCH be-comes LOW (0V). When POFA becomes LOW, data are transmitted from the CPUto the EEPROM. After completion of the data transmission, DCHbecomes LOW.
C Operation at power on
• When the power is turned on, FW rises to turn on the collectorand the emitter of Q108 so that IC136 8 pin voltage becomesabout 0.736V which is lower than 9 pin voltage (ZD106 5.2 ~5.5V). As a result, 14 pin is opened.
• 24V rises about 16msec after FW rising. C129 is chargedthrough R123 and D115. IC133 5 pin voltage becomes higherthan the reference voltage IC136 10 pin (ZD106 5.2 ~ 5.5V) inabout 95msec so that 13 pin (POFA) becomes high.
D Operation at power off
• When the power is turned off, FW rises to open the collectorand the emitter of Q108. C123 is charged through R137. IC1368 pin voltage becomes higher than 9 pin (ZD106 5.2 ~ 5.5V) inabout 30msec. As a result, 14 pin becomes low.
• When IC136 14 pin becomes low, C129 is discharged and 11pin voltage becomes about 0.8V which is lower than 10 pin(ZD106 5.2 ~ 5.5V). As a result, 13 pin (POFA) becomes low.
E Operations at an instantaneous service interruptionSince POFA signal is outputted by IC136, it may be erroneouslyoutput by discrepancy of resign times of 5V and 10V. To preventagainst this, power voltages of 5V and 10V are monitored byR167, 168, 170, 171, and IC142.
• When the power is turned off, POFA should be driven low (0V)at the early stage. If it is driven low too early, however, themachine stops its operation even at an instantaneous serviceinterruption (less than 30msec) which will not obstruct machineoperation in normal cases. Therefore, off state of AC power formore than 30msec is judged as power OFF in this circuit andPOFA is driven low.
• In normal operations, IC136 8 pin is at LOW level. At an instan-taneous service interruption, FW becomes LOW to open thecollector and the emitter of Q108, charging C123 throughR137. So it takes more than 30msec for IC136 8 pin voltage torise above the reference voltage (IC136 9 pin, 5.2V ~ 5.5V),and the machine does not stop at an instantaneous serviceinterruption of 30msec or less.
F Operations when the power voltage falls
• When the AC power voltage falls below a certain level, the DCpower voltage also falls though the DC power circuit is aregulator circuit. Therefore, 24V is monitored and when it falls to 19V, POFA isdriven low (0V). (When it falls below 19V, IC136 11 pin voltagebecomes lower than 10 pin reference voltage because of volt-age division by R123 and R125. As a result, the output ofcomparator (IC136) becomes low.)
20ms
19V(38ms)
30ms
207.03ms
ON OFF
VB
VD2
POWER
VB
VC
VD
0V
FW
POFA
RESET
DCH
CPU, ROM, I/O and EEPROMoperation start
Data transmission betweenCPU and EEPROM
Circuit operationstop
<30ms
(6) Heater lamp control circuit
1 GeneralThe heater lamp control circuit detects the heat roller surfacetemperature with the thermistor, converts it into voltage level, andoutputs it to the CPU analog input pin.
The CPU converts the analog voltage into digital signal level, com-pares it with the value set by test commands, turns on/off the heaterlamp according to the level, and maintain the heat roller surfacetemperature at a constant level. When a paper jam occurs in the SF-2040, this control circuit operatesfor max. 3 min to shorten the jam recovery time (8 sec).
5
4 2
3
12
R1445.8KF
VAREF 2-7B
R1501KF
R14656KJ
R15210KF
D114
MA700
TP53-FTH
+10V1
C18922000PF
IC137A
NJM2901
R1423.3KF
RTH
RTH
3-5C
I-23
2-6D
HL 7 10
IC124
-HL
R116430J(1\2W)
2.2K10K
Q106DTA123YS
+10V
ULN-2003
HL
11 – 14
When the heat roller surface temperature is low, the thermistor resis-tance increases. When the surface temperature is high, the resis-tance decreases. The thermistor terminal voltage, therefore, in-creases when the heat roller surface temperature is low, anddecreases when the temperature is high. The thermistor terminalvoltage is inputted to the CPU analog port, and the CPU controlson/off of the heater lamp with the input voltage level.
[High temperature protecting circuit in wild run of theCPU]The voltage at IC137 4 pin (reference voltage) is divided by R144 andR142, and the thermistor terminal voltage is applied to IC137 2 pin. When 5 pin voltage is lower than 4 pin voltage (the heat roller surfacetemperature: about 230 degree C), IC133 2 pin becomes LOW. As aresult, HL signal is pulled to the GND level and the heater lamplighting signal is not generated. (IC137 output 2 pin is normally HIGH(Open state).)
[When the heat roller surface temperature is lower thanthe set temperature]a. Since the thermistor pin voltage is higher than the set level, output
signal HL from the CPU becomes HIGH.
b. HL signal is passed through IC124, and Q106 to the solid staterelay. When, therefore, HL signal is LOW, the internal triac turns on.
c. When the internal traic turns on, a pulse is applied to the gate ofthe external triac to allow a current to flow from the power sourcethrough the heater lamp to the triac, thus lighting the heater lamp.
[When the heat roller surface temperature is higher thanthe set temperature]a. Since the thermistor pin voltage is lower than the set level, output
signal HL from the CPU becomes low.
b. HL becomes low, SSR is turned off, the external triac is turned off,and the heater lamp is turned off.
[Q106]Q301 protects the heater lamp from lighting due to trouble in theharness of the heater lamp drive signal.
(7) Driver circuit (Solenoid, magnetic clutch)
1 GeneralThe control signals of each load outputted from the CPU and I/Ocannot drive the load directly. The output, therefore, is delivered tothe load through the driver IC.
2 OperationThe driver circuit forms a Darlington circuit with two transistors toobtain a large drive current (load current) from a small input current(I/O output current). When the driver input voltage is HIGH (+5V), thetransistor is turned on to flow a current in the arrow direction, operat-ing the load. When the driver is turned on, the driver output pinvoltage is 0V.
(8) Stepping motor drive circuit
1 GeneralThe driver circuit drives the lens drive motor, the mirror base drivemotor, the automatic duplex copy tray, the side plate motor, and therear plate motor.
A: Stepping motor phase A coil drive signalB: Stepping motor phase B coil drive signalA: Stepping motor phase A coil drive signalB: Stepping motor phase B coil drive signal
Drivesignal
Lensdrive
Mirror basedrive
For Sideplate
For rearplate
A LEMT0 MBMT0 PAM1-0 PAM2-0B LEMT1 MBMT1 PAM1-1 PAM2-1A LEMT2 MBMT2 PAM1-2 PAM2-2B LEMT3 MBMT3 PAM1-3 PAM2-3
LOAD
+24V
I/OOutput
B B+24V
Phase B Phase B
A
A
+24V
Phase A
Phase A
A
A
B
B
Stepping motor time chart
11 – 15
(9) AE (Auto Exposure) sensor circuitThe AE circuit is composed of the AE sensor PWB which is com-posed of the photo diode, the I-V convertor circuit, and the amplifiercircuit, and the amplifier circuit on the control PWB.
Operation amplifier A performs I-V conversion of the original densitylevel (minute current) from the sensor. Operation amplifiers B and Camplify the output of operation amplifier A to a suitable level forinputting to the CPU. The amplifying level is automatically set by selecting the AE gainsignal (AEG0 ~ AEG2) outputted from the I/O chip when test com-mand SIM 47 is executed. AE operation is performed by the software in the control PWB. Whena reflected ray enters the sensor, a voltage corresponding to the lightquantity is inputted to the CPU. The CPU compares the input voltageand the copy lamp application voltage and controls the copy lampvoltage so that the exposure level corresponds to the original density.
(10) Toner supply motor drive circuitIC104 is the motor control IC which drives the toner supply motor withthe pulse signals (TMa, TMb) outputted from the I/O chip.
Internal circuit
Truth value table
Input OutputMode
TMa TMb TMa TMb
L L ∞ ∞ Stop
H L H L CW/CCW
L H L H CCW/CW
H H L L Brake
∞: High impedance
3. Operation circuit
General• The operation circuit is composed of the key matrix circuit and the
display circuit.
<Key circuit>(1) Block diagram
(2) Key detectionKey detection is performed by the key detection IC (LR3717M) withmatrix of S0 ~ S7 and K0 ~ K6. Information is set to the CPU by serialdata transmission. (8 x 8 matrix available)
The transmission system is PPM (Pulse Position Modulation) systemusing 15 bit data pulse signals. The PPM transmission makes distinction of pulse width as logic "1" orlogic "0."
+-
+-
U1BS500B
R6100KF
R1
100KF
IC1B
LM358
756
123
4
8
+10V
LM358
+10V
R2 AES
R410KF
R3
100KF
3
2
1GND
R5
10KF
TMa
TMb
R21647KJ
R22847KJ
2
9
1
5
+5V2
IC104
TA7291S
IN1
IN2
GND
6
8
7
3
+C101
10UF35V
TMa
TMb
+24V
C-1
C-3
1-4C
1-4C
2 8
9 1 5
6
7
3
M
REG
GND
Protectioncircuit(Heat insulated)
+5V +24V
TMa
TMb
+24V
TMa
TMb
4Pin is NC.
OUT
S0~S7,K0~K6
ICLR3717M
To CPU
LCDMaincontrol
Keymatrixsection
CPUNJM2901
5V 5V
ICLR3717M
S7 S0
K0
K6LCD Main control
Serial data
Output
Matrix section
11 – 16
As shown above, when the pulse interval is T, the pulse is judged aslogic "1," and when the pulse interval is T/2, it is judged as logic "0."Pulse signals of 15 bits are serially sent. PPM signal is judged from pulse interval "t" as shown below:
When t < 0.4 m : AbnormalWhen 0.4 ms < t < 1.6 ms : "0"When 1.6 ms < t < 3.2 ms : "1"When 3.2 ms < t : Abnormal
When any abnormal signal enters the circuit, all the bits are cleared.Then the operation starts from the first bit again. When data of more than 16 bits (17 pulse or more) are inputted, it isjudged as an abnormal signal and all the bits are cleared. Then theoperation begins from the first bit again. The 15 bit data assignment is as shown below:
A System address (Refer to *1.) C1, C2, C3, C4, C5These data are set with the switches and assigned dependingon the system. 56 channels and 2 bit expansion are availablefor sending commands for one system.
*1: System addressThis bit is set to prevent against malfunction in wireless com-munication with other devices (VTR, TV, etc.). For this time,communication is made through wires and there is no need toset this bit. Set to "0."
B Data C6, C7, C8, C9, C10, C11These data are assigned with the key input. Commands cor-responding to C6 ~ C11 are as shown below:
T
T/2
Logic "1"
Logic "0"
C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 K
CheckJudge
System adress Data Expansion
C6 C7 C8 C9 C10 C11 CH C6 C7 C8 C9 C10 C11 CH C6 C7 C8 C9 C10 C11 CH C6 C7 C8 C9 C10 C11 CH
1 0 0 0 0 0 1 0 0 0 0 1 0 16 1 1 1 1 1 0 31 0 1 1 1 0 1 46
0 1 0 0 0 0 2 1 0 0 0 1 0 17 0 0 0 0 0 1 32 1 1 1 1 0 1 47
1 1 0 0 0 0 3 0 1 0 0 1 0 18 1 0 0 0 0 1 33 0 0 0 0 1 1 48
0 0 1 0 0 0 4 1 1 0 0 1 0 19 0 1 0 0 0 1 34 1 0 0 0 1 1 49
1 0 1 0 0 0 5 0 0 1 0 1 0 20 1 1 0 0 0 1 35 0 1 0 0 1 1 50
0 1 1 0 0 0 6 1 0 1 0 1 0 21 0 0 1 0 0 1 36 1 1 0 0 1 1 51
1 1 1 0 0 0 7 0 1 1 0 1 0 22 1 0 1 0 0 1 37 0 0 1 0 1 1 52
0 0 0 1 0 0 8 1 1 1 0 1 0 23 0 1 1 0 0 1 38 1 0 1 0 1 1 53
1 0 0 1 0 0 9 0 0 0 1 1 0 24 1 1 1 0 0 1 39 0 1 1 0 1 1 54
0 1 0 1 0 0 10 1 0 0 1 1 0 25 0 0 0 1 0 1 40 1 1 1 0 1 1 55
1 1 0 1 0 0 11 0 1 0 1 1 0 26 1 0 0 1 0 1 41 0 0 0 1 1 1 56
0 0 1 1 0 0 12 1 1 0 1 1 0 27 0 1 0 1 0 1 42
1 0 1 1 0 0 13 0 0 1 1 1 0 28 1 1 0 1 0 1 43
0 1 1 1 0 0 14 1 0 1 1 1 0 29 0 0 1 1 0 1 44
1 1 1 1 0 0 15 0 1 1 1 1 0 30 1 0 1 1 0 1 45
11 – 17
C Data expansion C12, C13These are set with the switches and used to expand com-mands.
D Data judgment K (Refer to *2.)The last bit is for judgement of data transmission system.Date are transmitted as follows by using this bit.
*2: Data judgmentThe data are not reversed in this case.
(a) Normal signals
(b) Reverse signals
When the data judgment bit is "0," normal signals are trans-mitted. When it is "1," the reverse signals of C0 ~ C14 and K aretransmitted.
As shown above, normal signals and reverse signals arerepeated in series in a certain cycle. In the receiver side, judg-ment between normal and reverse signals is performed with thedata judgement bit to form data properly.
E Check bit C14C14 is fixed to GND in the LSI and no pin is provided in thepackage.
(3) System configuration
When command [3] is sent, for example, press the key at the inter-section between K0 and S2. The 15 bit data at that time is as follows:
[3] 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0System address bit Data bit
67.5ms
64ms
67.5ms
64ms(When f=455KHz)(When f=480KHz)
Normal signal Reverse signal Normal signal
C12
C 1
C 2C 3
C 4
1 4
1 51 6
1 7
1 8C 5
2 52 6
614
S 0S 1S 2S3S4S5S 6S 7
K 0
K 1
K 2
K 3
K 4
K 5
K 6
7
8
9
1 1
1 2
1 3
1 2 3 4 5 6 7 8
9 10 1 1 1 2 1 3 1 5 1 6
1 7 18 1 9 2 0 2 1 22 2 3 2 4
2 5 26 2 7 2 8 2 9 30 3 1 3 2
3 3 34 3 5 3 6 3 7 38 3 9 4 0
4 1 42 4 3 4 4 4 5 46 4 7 4 8
4 9 50 5 1 5 2 5 3 54 5 5 5 6
2 1 3 0 3 5 3 4 3 3 3 2 31
CIIU OSCI OSCO OU T
C13
YDD
2 2 2 0 2 1 24Key matrix
Systemaddressset circuit
Dataexpansionset circuit
0 0 0 0 0 0 01 1 1 0 0 0 01
0 0 0 0 0 0 01 1 1 0 10 1 1
11 – 18
<Display circuit>This circuit is controlled with the data signal and the control signalfrom the main control circuit.
(1) Block diagram
32 bit driver block diagram (2) Operational description
Data signals (8 bit) sent from the main control PWB are shifted at therising timing of the clock and retained at the resign timing of the latchsignal. The retained data are outputted when STROBE signal becomesHIGH (5V), lighting the LED.
VD CLK LATCH
S INOUT
VD (+5V)
VD (+10V)
LED
DATA
CLK
LATCH
BEO
S OUT
STROBE
LCDMaincontrolcircuit
BEO
DC powercircuit
VD (+5V) VD (+10V)
DATASout
CLK
LATCH
BEO
GND
32 bit Shift Register
32 bit Latch
Driver ON/OFF Control
Driver
01 032
VD
GND
1
5V
5V
5V
1
2
3
4
Clock
Data signal
Latch signal
Strobe signal
Output LED
51
52
LED lightup at LOWlevel (0V)
8
11 – 19
4. LCD display circuit
(1) Block diagram
(2) CPU (IC222) µPD78213G-AB8
1 GeneralThe CPU sends and receives date to/from the main circuit and theoperation PWB through the serial data communication line, and con-trols the display system.
2 Pin arrangement
IC205IC209IC212
IC214IC215
IC202IC204IC207
A-RAMV-RAM
VR201
A0 ~ A12
CPU
IC222
RDA0 ~ A19D0 ~ D7
MCLK
-19V
+10V -19VREM
5VREM
MD ~ MD15
IC235
IC216IC226IC227IC234
MCLKDCLK
A17CS
ASTBLC-RES
MCLK
IC229IC231
G-ROM
IC203IC206
IC228IC230IC232
IC210IC211
WRCS
LCD
IC213
D0 ~ D7
A0 ~ A15
DATAROMIC218
IC219
IC237IC236
PRO-GRAMROM
MC
PNCAUDCLAUDCPAUDO
AUDRD
RXD-OPDSR-OPTXD-OPDTR-OPRES-OP
LATCHCLKBEODATALED1LED2LED3LED4LED16
KEY IN
PTH B
PTH A
CCFT
PTHAVRA+5VLCD-19VLCD
SCP1CP2D0D1D2D3
AUDRDAUDO
MCPNCAUDCL
AUDCP
IC238
+10V+5VGND2-10V+24VGND1
IC223
CS
CS
Counter
Auditor
Invertor
Buffer
Driver controller
Timingsection
Latch Latch
Buffer
Buffer Buffer
Decoder
MainPWB
OPPWB
DriverIC221
IC224IC225
LCDunit
Q203Q204
IC201Q202
CC-ROM
Copiermain circuit
Displaydata output
Key inputdata input
LCD control PWB
CPU
LCD controller LCD display
Operation PWBLED display data inputKey input/data output
1P64/RD2P63/A193P62/A184P61/A175P60/A166RESET7X28X19VSS10P57/A1511P56/A1412P55/A1313P54/A1214P53/A1115P52/A1016P51/A9
48 P71/AN147 P72/AN246 P73/AN345 P74/AN444 P75/AN543 AVREF42 AVSS41 VDD40 EA39 P33/SO/SB038 P32/SCK37 P31/TXD36 P30/RXD35 P27/SI34 P26/INTP533 P25/INTP4
/ASCK17P
50/A
818
P47
/AD
719
P46
/AD
620
P45
/AD
521
P44
/AD
422
P43
/AD
323
P42
/AD
224
VS
S25
P41
/AD
126
P40
/AD
027
AS
TB
28P
20/N
MI
29P
21/IN
TP
030
P22
/INT
P1
31P
23/IN
TP
2/C
I32
P24
/INT
P3
64P
65/W
R63
P66
/WA
IT/A
N6
62P
67/R
EF
RQ
/AN
761
P07
60P
0659
P05
58P
0457
P03
56P
0255
P01
54P
0053
P37
/TO
352
P36
/TO
251
P35
/TO
150
P34
/TO
049
P70
/AN
0
µPD78213GC-AB8
11 – 20
3 CPU (IC310) pin signals
PinNo.
Signalname
IN/OUT Description
1 RD OUT Data read signal
2 A19 Address signal
3 A18 Address signal
4 A17 Address signal
5 A16 Address signal
6 RESET INReset signal input from the mainPWB
7 X2 — CPU clock
8 X1 — CPU clock
9 VSS GND
10 A15 Address signal
11 A14 Address signal
12 A13 Address signal
13 A12 Address signal
14 A11 Address signal
15 A10 Address signal
16 A9 Address signal
17 A8 Address signal
18 AD7 Address data signal
19 AD6 Address data signal
20 AD5 Address data signal
21 AD4 Address data signal
22 AD3 Address data signal
23 AD2 Address data signal
24 VSS GND
25 AD1 Address data signal
26 AD0 Address data signal
27 ASTB OUT Address latch signal
28 P20 NC
29 P21 NC
30 KEYIN IN Key input data
31 P23 NC
32 P24 NC
PinNo.
Signalname
IN/OUT Description
33 DTP-OP Main communication
34 P26 NC
35 P27 NC
36 TXD-OP IN Main communication
37 RXD-OP IN Main communication
38 SCK OUT LED clock
39 DATA OUT LED data
40 EA NC
41 VDD 5V
42 AVSS For analog port (GND)
43 AVREF For analog port (5V)
44 P75 NC
45 P74 NC
46 P73 NC
47 P72 NC
48 P71 NC
49 AN0 IN Analog data input signal
50 LED3 OUT (MSL) additional LED
51 LATCH OUT LED latch
52 BE0 OUT LED ON/OFF
53 LED17 IN (CRCL) Additional LED
54 LED16 OUT Ready display lamp
55 LED1 OUT Trimas display lamp
56 LED2 OUT Cover insertion display lamp
57 (DSR-OP) OUT Main communication
58 CCFT OUT Invertor ON/OFF
59 –19VREM OUT LCD -19V ON/OFF
60 5VREM OUT LCD 5V ON/OFF
61 LC-RES OUT LCD reset signal
62 LED4 OUT Edge erase function display lamp
63 WAIT OUT
64 WR OUT
11 – 21
(3) ROM
1 GeneralA. Program ROM (IC307)B. Data ROM (IC308)C. G ROM (IC301) For storing graphic data.D. C.G ROM (IC302) For storing character data.
2 Pin arrangment
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
27C512
3 ROM pin signals (IC307/308)
PIN No. IN/OUT Signal name Description
1 IN A15 Address signal
2 IN A12 Address signal
3(
10IN
A7(
A0Address signal
11(
13OUT
D0(
D2Data signal
14 — GND GND (0V)
15(
19OUT
D3(
D7Data signal
20 IN CE ROM chip enable signal. When LOW, ROM data output enabled.
2122
INA10OD
Address signalData output enable signal. When LOW, ROM data are sent to CPU.
232425
INININ
A11A9A8
Address signalAddress signalAddress signal
26 IN A13 Address signal
27 IN A14 Address signal
28 — 5V Power source
(4) Operation 1 The CPU receives image data from the main body. (Key data and
LED data are also transmitted.)
2 The received image data (corresponding to DATA-ROM address)are used to read character data (corresponding to CG-ROM ad-dress) and graphic data (corresponding to G-ROM address) in theDATA-ROM.
CG-ROM --- Standard Kanji character storing ROMG-ROM ----- Graphic data storing ROM
3 The upper address and the lower address of CG-ROM and G-ROM corresponding to characters and graphic data respectivelyare written into two V-RAMs (image areas).
4 The LCD controller outputs the specified address of character andgraphic data to be displayed. The CG-ROM outputs the data cor-responding to the specified address through the data bus to thedisplay unit.
5 The image data are transferred to the LCD unit.
6 The LCD contrast is controlled by the thermistor. (Refer to [1]-(5).)
7 Communication with the operation PWB is performed. (Refer to[3].)
8 Signals are sent from the main body through the LCD controlPWB to the counter and the auditor.
11 – 22
(5) LCD controller (IC305)
PinNo.
Signalname
IN/OUT H/L Description
1 MD0 INCharacter generator characterdot data
2 MD1 INCharacter generator characterdot data
3 MD2 INCharacter generator characterdot data
4 MD3 INCharacter generator characterdot data
5 MD4 INCharacter generator characterdot data
6 MD5 INCharacter generator characterdot data
7 MD6 INCharacter generator characterdot data
8 MD7 INCharacter generator characterdot data
9 MD8 IN ARAM attribute code data
10 MD9 IN ARAM attribute code data
11 MD10 IN ARAM attribute code data
12 MD11 IN ARAM attribute code data
13 MD12 IN ARAM attribute code data
14 MD13 IN ARAM attribute code data
15 MD14 IN ARAM attribute code data
16 MD15 IN ARAM attribute code data
17 VCC1 Power source (5V)
18 —
19 —
20 —
21 —
22 LU3 OUT LCD upper screen data
23 LU2 OUT LCD upper screen data
24 LU1 OUT LCD upper screen data
25 LU0 OUT LCD upper screen data
26 M OUT HLCD drive output AC convertorsignal
27 FLM OUT HTiming signal to show starting ofone frame
28 CL1 OUT H Display data latch signal
29 CL2 OUT H Display data shift signal
30 SK0 IN HTo use ROM and RAM for largescreen display
31 SK1 IN HTo use ROM and RAM for largescreen display
32 VCC2 Power source (5V)
33 DCLK INReference clock of LCDcontroller internal operation
34 MCLK OUT Clock to show memory cycle
35 —
36 —
37 GND2
38 RES IN L LCD controller reset signal
PinNo.
Signalname
IN/OUT H/L Description
39 CS IN LSignal to access LCD controllerinternal register
40 RS INTo select LCD controller addressregister and data
41 E(WR) IN LStrobe signal for CPU toread/write LCD controller
42 R/W(RD) IN LControls data transmissiondirection between
43 DB0Data transmission line of LCDcontroller and CPU
44 DB1Data transmission line of LCDcontroller and CPU
45 DB2Data transmission line of LCDcontroller and CPU
46 DB3Data transmission line of LCDcontroller and CPU
47 DB4Data transmission line of LCDcontroller and CPU
48 DB5Data transmission line of LCDcontroller and CPU
49 DB6Data transmission line of LCDcontroller and CPU
50 DB7Data transmission line of LCDcontroller and CPU
51 BLE INDetermines enable/disable ofcharacter blank
52 MODE IN Easy mode specifying
53 ON/OFF IN LCD display ON/OFF
54 WIDE IN Display command
55 D/S IN To select the number of screens
56 LS IN To select the large screen
57 AT UB
58 G/C INTo select graphic display andcharacter
59 GND1
60 RA4 OUT Laster address output
61 RA3 OUT Laster address output
62 RA2 OUT Laster address output
63 RA1 OUT Laster address output
64 PA0 OUT Laster address output
65 MA15 OUT Memory address output
66 MA14 OUT Memory address output
67 MA13 OUT Memory address output
68 MA12 OUT Memory address output
69 MA11 OUT Memory address output
70 MA10 OUT Memory address output
71 MA9 OUT Memory address output
72 MA8 OUT Memory address output
73 MA7 OUT Memory address output
74 MA6 OUT Memory address output
75 MA5 OUT Memory address output
76 MA4 OUT Memory address output
77 MA3 OUT Memory address output
78 MA2 OUT Memory address output
79 MA1 OUT Memory address output
80 MA0 OUT Memory address output
11 – 23
5. DC power circuit
The DC power circuit directly rectifies AC power. The AC power isswitching-transformed by the DC/DC convertor circuit, and rectifiedand smoothed again to produce DC voltages. The block diagram isas shown below:
Fig. 1 Block diagram
(Circuit description)
(1) Noise filter circuitThe noise filter circuit of the DC power source is composed of L andC as shown below to reduce normal mode noises and common modenoises flowing through the AC line. The normal mode noises are generated in the AC line or the outputline and reduced by L701. The common mode noises are noise voltages generated between theAC line and the ground (GND), and passed through C703 and C704to the ground (GND).
Fig. 2 Noise filter circuit
(2) Rush current limiting circuitSince the AC power is directly rectified, if this circuit were notprovided, an extremely large rush current would flow into the smooth-ing capacitor when turning on the power, degrading the switch con-tacts. To prevent against this rush current, the circuit composed as followsis provided between the rectifying diode (D701) and the smoothingcapacitors (C707, C708). When the power is supplied, a chargingcurrent flows through R702 and FR701 to the smoothing capacitor tolimit the current to less than 30uA when turning on the power. (Fig. 4)Then the voltage at the smoothing capacitor rises to operate theinvertor circuit, turning on the triac (TR701) with the voltagegenerated in the convertor transformer (T701). In normal operations,therefore, a current flows through TR701 but does not flow throughR702 and FR701.
Fig. 3 Rush current limiting circuit
AC in
(T701)
(PC702)
(PC701)
(PC703)
38V
24V
5V
-20V
10V
10V
FWFW circuit
Noise filtercircuit
Rush currentlimiting circuit
Rectifying/smoothingcircuit
Invertor circuit(Forward convertor)
Convertortransformer
Rectifying/smoothing
Rectifying/smoothing
Overcurrentprotectioncircuit
Controlcircuit
Overvoltageprotectioncircuit
Choppercircuit
Reguratorcircuit
Choppercircuit
Full-waverectifyingcircuit
F701
L701
C701 C702
C704
C703
GND
TR701
R702 FR701
R703 R704 R705 D702
To smoothing capacitors (C707,C708)
11 – 24
Fig. 4 Rush current
(3) Rectifying/smoothing circuit
Fig. 5 Rectifying/smoothing circuit
This circuit is the full-wave rectifying circuit which converts an ACvoltage into a DC voltage. The solid line and the dotted line show thepath of the charging current to the smoothing capacitors (C707,C708)
(4) Invertor circuit (Forward-convertor system)
Fig. 6 Invertor circuit
In the forward-convertor system, the FETs (Q701, Q702) connectedin series to the convertor transformer (T701) perform switching opera-tion and energy is supplied to the secondary side through the conver-tor transformer when turning on the power. A DC voltage of therectifying/smoothing circuit is converted into switching pulses by theFET which is controlled by signals from the control circuit, and a highfrequency power is supplied to the secondary side by the convertortransformer.
The solid line in the circuit diagram shows the path of a currentflowing when the FET is turned on, and the dotted line shows theclose loop of the snubber circuit which absorbs a counter electromo-tive force generated in the convertor transformer when turning off theFET.
(5)Rectifying/smoothing circuit in the secondary side (24V, 38V system)
Fig. 7
The high frequency pulses generated by the invertor circuit aredropped by the convertor transformer (T701) and rectified by the highfrequency diode and smoothed by the choke coil (L719) and theelectrolytic capacitor (C725 for 38V system or C731 and C732 for24V system).
50A
40A
30A
20A
10A
0A
10A
20A
30A
40A
50A
509
500
11
12
13
14
D701 C707C708
+
-
L711
L712
L715
L716
D717
L713 L714
C721 C722R733
C723C724
R734
R736 C72
8
C727
C72
9
C73
0
R737
L718L717
T701
R70
9
C709
C710
D70
3
R710
C711
C712
Q701
L705
L706
L707
R71
3
R71
1
Q702
L70
4R71
2
R708
L709L708
L702
L703
R706C708
+
-
+
-C7071
FR701
3.3/135C˚
R704 R705 D702
R703
R707
0V
0V
0A
Voltage between Q701 (Q702) gate andthe power source (VGS)
Voltage between Q701 (Q702) drain andthe power source (VDS)
Q701 (Q702) drain current (ID)
D717
C721 C722
C723
C724
C72
8
C727
C72
9
C73
0
+
-
PC702
+
-C73
1
C73
2
R73
8D
721
D72
2
L719
B
+
-
A
C725
T701 L711
L712
R733
L715
L716
R736
R737
L717 L718
L713 L714
R734
11 – 25
(6) Control circuitThis circuit uses the power MOS FET as the switching element. Itemploys the PWM control (Pulse Width Modulation) system. Thesecondary output (24V system), therefore, is detected by the voltagedetecting circuit and the detection signal is fed back through thephotocoupler (PC701) to the control IC to control the pulse width ofthe switching transistor in the primary side invertor circuit, stabilizingthe output voltage.
(7) Overcurrent protection circuit
Fig. 8 Overcurrent protection circuit
The negative $ line in the primary circuit is connected to the detect-ing resistor of the primary side current. When an overcurrent flows, itis detected by the resistor, which sends a signal to the control IC(IC701) to reduce the ON pulse width of the switching transistor,dropping the output voltage. In this circuit, the switching transistor isoperated intermittently when an overcurrent flows.
(8) Series regulator circuit (–20V system)
Fig. 9 Series regulator circuit
This circuit employs the dropper system, where the high frequencypulses from the choke coil (L723) in the 5V system chopper circuitare rectified by the diode (D728) and rectified by the electrolyticcapacitor (C737) and the voltage is dropped to 20V by the three-ter-minal regulator (IC703), stabilizing the output voltage.
(9) Chopper regulator circuit (10V, 5V system)
Fig. 10 IC704 (IC705) block diagram
The switching frequency is determined by the capacitor and resistorat 5 and 6 pins of IC 704 (IC705), and triangular waves of about50KHz are generated. The output from the output voltage detecting circuit (5V system:R761, VR702, R762; and 10V system: R784, VR703, R785) and thereference voltage (5V) at 14 pin of IC704 (IC705) are inputted to theerror amplifier in the IC, and ON/OFF period of output transistors TR1and TR2 are controlled (PWM control) through the PWM comparatorto drive the switching transistor, stabilizing the output voltage.
Fig. 11
(10) FW system outputThe AC input voltage is full-wave rectified by D704 - D707. By turningon/off Q704, the photocoupler (PC703) is synchronized to turn on/off.The signal synchronized with the AC voltage waveform is sent to thesecondary side by the photocoupler and Q705 is similarly turnedon/off. Thus the FW signal is outputted in synchronization with the ACvoltage waveform.
Fig. 12 FW system output
i
R715
R716
R717 R718
To IC701
(From Q701,Q702)
Fig. 13
(11) Overvoltage protection circuitWhen an overvoltage is generated in each output line (except for–20V system), a signal is sent from the overvoltage detection circuitthrough the photocoupler (PC702) to the primary side control circuit,and the invertor operation is stopped by the switching stop function ofIC701 to limit rising of the output voltage. The operation is of the latch system. After removing an overcurrent,the AC power is supplied again to restore the operation.
(Waveform of each section)Conditions: Input 120VAC, 50Hz, rated load
Fig. 14
Fig. 15
Fig. 16
Fig. 17
Fig. 18
Fig. 19
Fig. 20
GND
0V
Voltage waveformat point A
FW system output waveform
270V
0
T1=2.2µS, T2=8.4µST1
T2
25V
0
T1=6µS, T2=22µST1
T2
39V
0
T1=7µS, T2=22µST1
T2
24V
0
T1=0.65mS, T2=10mST1
T2
3.1V
0
T1=22µST1
T1
3.1V
0
T1=22µS
3.2V
0
T1=8.2µST1
11 – 27
A. 1
00V
Ser
ies
38V
Fig
.20
1
+ -
+ -
167V
DC
Fig
.14
24V
DC
120VAC
[N]
[L]
F70
115
A/1
25V
L701
SC
-05-
50J
C7010.47[XE]
C7044700P[KC]
C7034700P[KC]
R7020.47[XE]
R701 150K[1/2W]
D70
1S
15W
B40
R70
23.
3/7W
FR70
1
3.3/
135˚
C
C7071500/200V[LQC]
C7081500/200V[LQC]
TR70
1B
CR
16P
MB
LAA
R70
31K
R70
447
[1W
]R
705
47[1
W]
D70
2E
RA
9102
L702
B01
A
L703
B01
A
R70
633
K[3
W]
R70
727
K[2
W]
C70
90.
1/40
0V
C71
047
0P/1
KV
[HR
]
Q70
22S
K72
5Q
701
2SK
725
C70
647
00P
[KC
]
R71
50.
1/5W
R71
60.
1/5W
R71
782
[H]
D704ERA1504
D705ERA1504
D706ERA1504
D707ERA1504
C70
54
700P
[KC
]
R71
810
0[H
]
R71
910
K
D711RD30ESAB2
R72
027
K[1
W]
R72
127
K[1
W]
D70
8R
D6.
2ES
AB
2
C71
40.
01R
722
2.7K
Q70
42S
C18
15R
724
10K
[1/4
W]
PC
703
TLP
621
R72
310
K[1
/4W
]R
725
10[H
]
23
4
87
65
IC70
1F
A53
14P
C7150.1[RPE]
C716 0.001 or 0.001[RPE]
R727 12K
R728 2.2K
C717
0.1[RPE]R7291K
PC702TLP621
C71
30.
047/
400V
PC701
TLP621
C718 0.0068R
708
27[2
W]
L70
8B
01A
L70
9B
01A
R71422[1/4W]
L706B01A
L704B01A
L707
B01A
L705
B01A
R71310K[1/4W]
R71222[1/4W]
R71110K[1/4W]
C7121000P/1KV[HR]
C7111000P/1KV[HR]
R71047[3W]
D703ERB3806
R70922K[3W]
D712 RD10EL1
D713 1SS178
R73
04.
7K
+ -
+ -C
719
47[P
F]
D714ERA9102
C72
047
[PF
]
L710
TS
L111
0-33
2KR
17
D71
6E
RA
910
2
D73
7E
RA
9102
D71
5E
RA
9102
D73
8E
RA
9102
R73
14.
7[1/
4W]
R73
24
.7[1
/4W
]
C72
1 10
00P
/1K
V[H
R]
D71
7E
SA
D92
03
D717ESAD9202
L715
B01
A
L716
B01
A
L712
B01
A
L711
B01
A
R73
633
[2W
]
1000
P/1
KV
[HR
]
L713
B01
AL7
14B
01A
T70
1N
-T00
-710
R73
333
[2W
]C
722
1000
P/1
KV
[HR
]
C72
310
00P
/1K
V[H
R]
C72
4 10
00P
/1K
V[H
R]
R73
422
[3W
]
C7281000P/1KV[HR]
C727 C7301000P/1KV[HR]
C7291000P/1KV[HR]
L717
B01
A
R73
733
[3W
]
L718
B01
A
L719
C-L
00-2
69
RE
T
38V
A
D71
8R
D39
EB
7
D71
91S
S17
8
B
+ -
C7252200[PF]
F70
225
0V/3
A
F70
312
5V/5
A
CN
702-
20
CN
702-
18
C7260.1/50V[RPE]
+ -
+ -
D72
3
D72
4
1SS
178
1SS
178
D72
5
D72
6
RD
5.6E
SA
B2
RD
13E
SA
B2
DC
D72
21S
S17
8
D721RD27ESAB2
R738220[1/4W]
PC
702
C7312200/35V[PF]
C732 2200/35V[PF]
µP
C10
93
R73
92.
2K
R740 2.2KPC701
IC70
2
R74
310
K
C73
410
0P/5
0V
R74
12.
2K
R742 2.2K
C733 0.47[MP]
R74
422
K
R74
5 2.
2KVR7011KB
PC703R74
610
[H]
R74
733
K
D727RD6.2ESAB2
R74
82.
7K
Q7052SC1815
R7494.7K[1/4W]
24V
F70
425
0V/3
A CN
702-
29,3
024
V
C73
50.
1/50
V[R
PE
]
CN
702-
26,2
824
VC
N70
2-22
,24
RE
T
125V
/5A
F70
5
F70
625
0V/3
AFW
CN
702-
16
Fig
.17
• R
esis
tors
are
1/6
W u
nles
s ot
herw
ise
spec
ified
.
• E
lect
roly
tic c
apac
itors
(
) a
re 5
0V u
nles
s ot
herw
ise
spec
ified
.
• T
he o
ther
cap
acito
rs (
)
are
100
V u
nles
s ot
herw
ise
spec
ified
.
11 – 28
1 2 3 4 5 6 7 8 9 10 11 12 13 14 1615
1 2 3 4 5 6 7 8 9 10 11 12 13 14 1615
1 NC
L
NCN
2
34
CN701
JSTB2P4-VH-B
2 5V15V
4 5V35V
6 -20V55V8 -20V PET75V
10 10V29PET
12 10V1
14 PET
16 FW
18 38V
20 38V
2224
2628
24V
30 24V
11PET
13PET
15PET
17PET
19PET
21PET23PET
25PET27PET
2924V
24V
CN702
HRSDF18-30DP-2.5DSA
PET CN702-8
-20V CN702-6
5V 1,2CN702 3,4
5,7
PET
10V1 CN702-12
10V2 CN702-10
PET
B
A
C
D
-25VDC
Fig.15
Fig.18
Fig.16
5VDC
5VDC
Fig.19
IP701ICPN25
L721B01A
Q7062SA1541
L723C-L00-268
C736470P/1KV[HR]
D728ERB9102
R75
010
K[1/
4W]
R75
110
K[1/
4W]
+
-
C73
722
0/35
V[PF
]
+
-
C73
822
/35V
[PF]
IC703HA178M20P
C7390.1[RPE]
L722PJ8T-8R2M
C7401500/35V[PF]
R77
310
0[1/
4W]
+
-
R754180[1W]
R755180[1W]
R752150
R753150
C741
1000
P/1K
V[HR
]
D729ESAB92M02orYG901C2
R7561.5K
R75739K
R7580.05/2W
R759100[H]
+
-
C742
1000
/35V
[PF]
+
-
C75
068
0/10
V[PF
]
L724L1000511
C74
30.
1/50
V[R
PE]
C7441[MP]
R7612.7K
R7601K
R7622.2K
VR7021KB
+-
D730 1SS178
R76510K
R76610[H] R
767
2.2K
R76427K
R763
1K
C74522/35V[PF]
IC704MB3759M
R7682.2K
C7470.022
R76
9 4.
7K
C74
60.
001
or
0.00
1/50
V[R
PE]
R77
0 27
K
C7480.022 or0.022/50V[RPE]
R77112K
+
-
V749
22/3
5V[P
F]
R7722.2K
L725PJ8T-8R2M
R77
4 2.
2K[1
/4W
]
R77
515
[1/4
W]
R77
64.
7K[1
/4W
]
Q7072SC1959
Q7082SJ176
L726N-L00-046
D7311SS178
D732ERC9102
R7771.2K[1/4W]
R7781.2K[1/4W]
+
-
C7520.022
C75
1 15
00[P
F]
R7810.1/2W
R779820
R78039K
R782100[H]
+
-
C75
415
00/1
6V[P
F]
C75
50.
1/50
V[R
PF]
R7831K
VR7031KB
R7852.2K
C7564.7[MP]
R7842.7K
C76
410
00/1
6V[P
F]
D736ERC81004
D733RD5.6ESAB2
IC705MB3759M
+-
C757 22[PF] R787
1KR788
68K
+
-
D735RD5.6ESAB2
D7341SS178
R7866.8K
R78910[H]
R790
2.2K
R7912.2K
C7580.022
R79
2 4.
7K
C759
0.00
1 or
0.00
1/50
V[R
PE]
R79
3 27
K
C7600.1 or0.1/50V[RPE]
R79412K
C76122[PF]
• Resistors are 1/6W unless otherwise specified.
• Electrolytic capacitors ( ) are 50V unless otherwise specified.
• The other capacitors ( ) are 100V unless otherwise specified.
11 – 29
Fig. 21
Fig. 22
Fig. 23
Fig. 24
Fig. 25
Fig. 26
Fig. 27
440V
0
T1=2.8µS, T2=8.4µST1
T2
25V
0
T1=6µS, T2=22µST1
T2
39V
0
T1=7µS, T2=22µST1
T2
24V
0
T1=0.5mS, T2=10mST1
T2
3.1V
0
T1=22µST1
3.1V
0
T1=22µST1
3.2V
0
T1=8.2µST1
11 – 30
B. 2
00V
Ser
ies
38V
Fig
.27
1
+ -
+ -
297V
DC
Fig
.21
24V
DC
220VAC
[N]
[L]
F70
1F
6.3A
H/2
50V
L701
SC
-05-
50J
C7010.47[XE]
C7044700P[KC]
C7034700P[KC]
R7020.47[XE]
R701 330K[1/2W]
D70
1S
15W
B40
R70
26.
8/7W
FR
701
6.8/
135˚
C
C707390/400V[LQC]
C708390/400V[LQC]
TR
701
BC
R10
PM
12LA
AR
703
1K
R70
447
[1W
]R
705
47[1
W]
D70
2E
RA
9102
L702
B01
A
L703
B01
A
R70
656
K[3
W]
R70
768
K[2
W]
C70
90.
1/40
0V
C71
047
0P/1
KV
[HR
]
Q70
22S
K15
11Q
701
2SK
1511
C70
633
00P
[KC
]
R71
50.
1/5W
R71
756
[H]
D704ERA1504
D705ERA1504
D706ERA1504
D707ERA1504
C70
533
00P
[KC
]
R71
810
0[H
]
R71
910
K
D711RD30ESAB2
R72
047
K[1
W]
R72
147
K[1
W]
D70
8R
D13
ES
AB
2
C71
40.
01R
722
2.7K
Q70
42S
C18
15R
724
10K
[1/4
W]
PC
703
PC
111
R72
310
K[1
/4W
]R
725
10[H
]
23
4
87
65
IC70
1F
A53
14P
C7150.1[RPE]
C716 0.001 or 0.001[RPE]
R727 12K
R728 2.2K
C717
0.1[RPE]R7291K
PC702PC111
C71
30.
047/
400V
PC701
PC111
C718 0.0082R
708
68K
[2W
]
L708
B01
AL7
09B
01A
R71427[1/4W]
L706B01A
L704B01A
L707
B01A
L705
B01A
R71310K[1/4W]
R71227[1/4W]
R71110K[1/4W]
C7121000P/1KV[HR]
C7111000P/1KV[HR]
R71068[5W]
D703PG1C
R70947K[3W]
D712 RD10EL1
D713 1SS178
R73
04.
7K
+ -
+ -C
719
47[P
F]
D714ERA9102
C72
047
[PF
]
L710
TS
L111
0-33
2KR
17
D71
6E
RA
9102
D73
7E
RA
9102
D71
5E
RA
9102
D73
8E
RA
9102
R73
14.
7[1/
4W]
R73
24.
7[1/
4W]
C72
1 10
00P
/1K
V[H
R]
D71
7E
SA
D92
03
D717ESAD9202
L715
B01
A
L716
B01
A
L712
B01
A
L711
B01
A
R73
633
[2W
]
1000
P/1
KV
[HR
]
L713
B01
AL7
14B
01A
T70
1N
-T00
-717
R73
333
[2W
]C
722
1000
P/1
KV
[HR
]
C72
310
00P
/1K
V[H
R]
C72
4 10
00P
/1K
V[H
R]
R73
422
[3W
]
C7281000P/1KV[HR]
C727 C7301000P/1KV[HR]
C7291000P/1KV[HR]
L717
B01
A
R73
733
[3W
]
L718
B01
A
L719
C-L
00-2
69
RE
T
38V
A
D71
8R
D39
EB
7
D71
91S
S17
8
B
+ -
C7252200[PF]
F70
225
0VT
3.15
AL
F70
325
0VT
5AL
CN
702-
20
CN
702-
18
C7260.1/50V[RPE]
+ -
+ -
D72
3
D72
4
1SS
178
1SS
178
D72
5
D72
6
RD
5.6E
SA
B2
RD
13E
SA
B2
DC
D72
21S
S17
8
D721RD27ESAB2
R738220[1/4W]
PC
702
C7312200/35V[PF]
C732 2200/35V[PF]
µP
C10
93
R73
92.
2K
R740 2.2KPC701
IC70
2
R74
310
K
C73
410
0P/5
0V
R74
12.
2K
R742 2.2K
C733 0.47[MP]
R74
422
K
R74
5 2.
2KVR7011KB
PC703R74
610
[H]
R74
733
K
D727RD6.2ESAB2
R74
82.
7K
Q7052SC1815
R7494.7K[1/4W]
24V
CN
702-
29,3
024
V
C73
50.
1/50
V[R
PE
]
CN
702-
26,2
824
VC
N70
2-22
,24
RE
T
F70
5
F70
6
FWC
N70
2-16
Fig
.24
C76
233
00P
[KC
]
C76
333
00P
[KC
]
F70
425
0VT
3.15
AL
250V
T3.
15A
L
250V
T3.
15A
L
• R
esis
tors
are
1/6
W u
nles
s ot
herw
ise
spec
ified
.
• E
lect
roly
tic c
apac
itors
(
) a
re 5
0V u
nles
s ot
herw
ise
spec
ified
.
• T
he o
ther
cap
acito
rs (
)
are
100
V u
nles
s ot
herw
ise
spec
ified
.
11 – 31
1 2 3 4 5 6 7 8 9 10 11 12 13 14 1615
1 2 3 4 5 6 7 8 9 10 11 12 13 14 1615
1
NC
L
NC
N
23
4
CN701
JSTB2P4-VH-B
2 5V15V
4 5V35V6 -20V55V
8 -20V PET75V
10 10V29PET
12 10V1
14 PET
16 FW
18 38V
20 38V222426
2824V
30 24V
11PET
13PET
15PET
17PET
19PET21PET23PET25PET
27PET
2924V
24V
CN702
HRSDF1B-30DP-2.5DSA
PET CN702-8
-20V CN702-6
5V 1,3CN702 2,4
5,7
PET
10V1 CN702-12
10V2 CN702-10
PET
B
A
C
D
-25VDC
Fig.22
Fig.25
Fig.23
5VDC
5VDC
Fig.26
IP701ICPN25
L721B01A
Q7062SA1541
L723C-L00-268
C736470P/1KV[HR]
D728ERB9102
R75
010
K[1/
4W]
R75
110
K[1
/4W
]
+
-
C73
722
0/35
V[PF
]
+
-
C73
822
/35V
[PF]
IC703HA178M20P
C7390.1[RPE]
L722PJ8T-8R2M
C7401500/35V[PF]
R77
310
0[1/
4W]
+
-
R754180[1W]
R755180[1W]
R752150
R753150
C74
110
00P/
1KV[
HR
]
D729ESAB92M02orYG901C2
R7561.5K
R75739K
R7580.05/2W
R759100[H]
+
-
C74
210
00/3
5V[P
F]
+
-
C75
068
0/10
V[PF
]
L724L1000511
C74
30.
1/50
V[R
PE]
C7441[MP]
R7612.7K
R7601K
R7622.2K
VR7021KB
+-
D730 1SS178
R76510K
R76610[H] R
767
2.2K
R76427K
R763
1K
C74522/35V[PF]
IC704MB3759M
R7682.2K
C7470.022
R76
9 4.
7K
C74
60.
001
or
0.00
1/50
V[R
PE]
R77
0 27
K
C7480.022 or0.022/50V[RPE]
R77112K
+
-
V749
22/3
5V[P
F]
R7722.2K
L725PJ8T-8R2M
R77
4 2.
2K[1
/4W
]
R77
515
[1/4
W]
R77
64.
7K[1
/4W
]
Q7072SC1959
Q7082SJ176
L726N-L00-046
D7311SS178
D732ERC9102
R7771.2K[1/4W]
R7781.2K[1/4W]
+
-
C7520.022
C75
1 15
00[P
F]
R7810.1/2W
R779820
R78039K
R782100[H]
+
-
C75
415
00/1
6V[P
F]
C755
0.1/
50V[
RPF
]
R7831K
VR7031KB
R7852.2K
C7564.7[MP]
R7842.7K
C76
410
00/1
6V[P
F]
D736ERC81004
D733RD5.6ESAB2
IC705MB3759M
+-
C757 22[PF] R787
1KR788
68K
+
-
D735RD5.6ESAB2
D7341SS178
R7866.8K
R78910[H]
R790
2.2K
R7912.2K
C7580.022
R79
2 4.
7K
C75
90.
001
or0.
001/
50V
[RPE
]
R79
3 27
K
C7600.1 or0.1/50V[RPE]
R79412K
C76122[PF]
• Resistors are 1/6W unless otherwise specified.
• Electrolytic capacitors ( ) are 50V unless otherwise specified.
• The other capacitors ( ) are 100V unless otherwise specified.
11 – 32
6. Desk circuit
(1) Block diagram
SF-D23
PP
C b
ody
Com
mun
icat
ion
circ
uit
Res
et c
ircui
t
Lift
mot
ordr
ive
circ
uit
Lift
mot
or
rota
tion
sens
or in
put c
ircui
t
Tra
nspo
rt m
otor
driv
e ci
rcui
t
Tra
nspo
rt m
otor
spee
d co
ntro
l pul
sege
nera
ting
circ
uit
Tra
nsp
ort m
oto
rsp
eed
con
trol
sig
nal
inp
ut/o
utpu
t circ
uit
Osc
illat
ion
circ
uit
12M
Hz
Latc
h
Res
ist s
enso
rin
put/o
utpu
tci
rcui
t
Siz
e se
nsor
inpu
t/out
put
Left
am
ount
sen
sor
inpu
t/out
put
circ
uit
5VD
C h
oppe
rm
otor
out
put
circ
uit
500C
clu
tch
sole
noid
driv
eci
rcui
t
Inpu
t por
tex
tens
ion
IC
Par
alle
l in
Pap
er p
ass
sens
orin
put c
ircui
t
Pap
er p
ass
sens
orcl
ock
outp
ut c
ircui
t
Leve
l sen
sor/
limit
sens
or in
put c
ircui
t
Clu
tch
driv
eci
rcui
t
500-
shee
t ca
sse
ttese
nsor
/sw
itch
inp
ut c
ircui
t
RO
M
HM
OT
DP
OD
1
DP
OD
2
SIZ
ES
W
RE
ST
R
RE
ST
F
E1M
OT
E1C
LK
E2C
LK
E2M
OT
Ope
n/cl
ose
switc
hci
rcui
t
LUM
1
CP
FC
1
CP
FS
1
LUD
1
PE
D2
UC
SS
1
UC
SS
2
UC
SS
3
UC
SS
4
PF
NU
D
VD
C h
oppe
rm
otor
driv
eci
rcui
t
F/L
SW
DD
OP
DLP
D1
DLP
D2
DLP
D3
DP
E2
DLU
D1
DLU
D2
LMS
1
LMS
2
P1C
L
P2C
L
BLC
RC
L
11 – 33
A. Sensors and switches
Signal name Name Type Function/operation Contact/output
SIZESW Size switch Microswitch Size (A4, B5, Letter) selection
F/LSW Front loading open/closeswitch
Microswitch Desk open/close detection H level when open.
DPE2 Empty sensor Reflection type sensor Cassette 2 original presencedetection
H level when paper isdetected.
DLPD3 Paper pass sensor 2 Reflection type sensor Turns to H level when the paper leadedge is transported to the front ofpickup roller 1.
H level when paper isdetected.
DLPD2 Paper pass sensor 1 Reflection type sensor Turns to H level when the paper leadedge is transported to the back ofpickup roller 1.
H level when paper isdetected.
DDOP Side open/close sensor Photo interrupter Side cover open/close detection H level when open.
DLUD1 Level sensor 1 Photo interrupter Cassette 1 paper height control H level when interrupted.
LMS1 Limit sensor 1 Photo interrupter Prevention against excessive heightof cassette 1 paper
H level when interrupted.
DPOD1 Resist sensor 1 Photo interrupter Paper pass detection Paper in: L level
DLPD1 Paper pass sensor 0 Reflection type sensor Turns to H level when the paper leadedge is transported to the front ofseparation roller.
H level when paper isdetected.
DLUD2 Level sensor 2 Photo interrupter Cassette 2 paper height control H level when interrupted.
LMS2 Limit sensor 2 Photo interrupter Prevention against excessive heightof cassette 2 paper
H level when interrupted.
DPOD2 Resist sensor 2 Photo interrupter Paper pass detection Paper in: L level
E2CLK Elevator motor 2 clocksensor
Photo interrupter Elevator motor 2 encoder clockdetection
Pulse output
E1CLK Elevator motor 1 clocksensor
Photo interrupter Elevator motor 1 encoder clockdetection
Pulse output
B. Electromagnetic clutches
Signal name Name Type Function/operation Contact/output
P2CL Pick 2 clutch Electromagnetic clutch Links/releases the transport motordrive and the pick roller 2.
Links the drive when ON.
P1CL Pick 1 clutch Electromagnetic clutch Links/releases the transport motordrive and the pick roller 1.
Links the drive when ON.
BCL Separation clutch Electromagnetic clutch Links/releases the transport motordrive and the separation roller.
Links the drive when ON.
RCL Resist clutch Electromagnetic clutch Links/releases the transport motordrive and the resist roller.
Links the drive when ON.
C. Motors
Signal name Name Type Function/operation
E1MOT Elevator motor 1 DC motor Drives the lifting mechanism of cassette 1 paper bundle.
E2MOT Elevator motor 2 DC motor Drives the lifting mechanism of cassette 2 paper bundle.
HMOT Transport motor DC brushless motor Drives the whole mechanism of paper transport.
11 – 34
(2) Operating principle
A. Sensor and detector input circuits(a) Paper pass sensor (DLPD1 ∼ DLPD3, DPE2) input circuitThe paper pass sensor is a reflection type and is installed on the sheet feed path in the 3000-sheet LCC disk. It consists of an LED and phototransistor. The LED emits infrared light. The light is reflected by the paper (if any) and the reflected light enters the photo transistor to increase thephotocurrent of photo transistor, thus making it possible to detect the passage and reach of the paper.The paper sensors 0, 1, and 2, and the empty sensor have the same circuit configuration. Hereafter, the paper sensor 0 (DLPD1) will be explainedas an example.The sensor LED is pulse operated. The pulses are generated by the CPU’s timer and open collector outputted by Q13.1. R9 is an LED current limitresistance. The infrared light pulse-emitted is reflected by the paper if there is a sheet of paper under the sensor, and enters the photo transistor.The incident light increases the photocurrent of the photo transistor and the photocurrent flows through R18. Therefore, the voltage at part @ variesproportionately with the magnitude of incident light. IC10.5 converts this voltage into digital signal according to the threshold voltage (about 3 V).When the input voltage to IC10.5 is less than the threshold level, it is regarded as no paper; when more, it is regarded as the presence of paper.However, since the signal is reversed at IC10, the presence of paper is recognized at the low level (0 V) and the absence of paper at the high level(5 V) as to the CPU input port. The input signal is entered in pulses because the LED pulse-emits infrared light. The CPU incorporates this signal,synchronizing with the On and Off timing of the LED.
(b) Level sensor and limit sensor (DLUD1, 2 and LMS1, 2) input circuitsThe bundle of sheets of paper is lifted up by the lift-up motor to make the paper height in the 3000-sheet LCC disk suitable for sheet feeding. Twophoto interrupters serve as level sensors which detect the paper height. The limit sensors detect the upper limit of the height of the paper lifted up.The screen plate, located at the arm of the pick-up roller which comes in contact with the paper surface, operates synchronously with theup-and-down motion of the paper. The photo interrupters sense the position of the screen. The machine is equipped with two lift-up mechanisms,each of which has a level sensor and a limit sensor. The limit sensor not only sends the signal to the CPU but controls the stopping of the lift-upmotor. (For details, see the explanation of the lift-up motor driving circuit.)Both the level sensor and limit sensor have almost the same circuit configuration. To illustrate their circuit, the level sensor 1 (DLUD1) will bedescribed below.The photo interrupter consists of an LED and photo transistor (open collector output). The LED always emits light using the current limited by R1inside the relay board. When the screen enters the slit in the interrupter, the infrared light emitted from the LED is shut out to turn the phototransistor off (output high impedance). At this time, the signal at DLUD1 is made at the high level (5 V) by R1 in the control board. With the screencoming out of the slit, the photo transistor turns on and the signal at DLUD1 becomes the low level (0 V), R5 is an input protection resistance ofIC8.1 pin. IC8-1 shapes the waveform from the input signal. The shaping of the waveform is performed only at the level sensors 1 and 2. The signalat the limit sensors 1 and 2 enters from the protection resistance directly into the CPU.
DC5V
DLPD1-SIG
LED-A
CN.3
CN.2
CN.1
DLPD1
CN7.1
CN7.2
CN7.3
DC5V
DLPD1-SIG
LED-A
DC5V
DLPD1-SIG
LED-A
CN1.7
CN1.9
CN2.1R9
Interfeice PWB
CN1.7
CN1.9
CN2.1
DC5V
DLPD1-SIG
LED-A
2
9
1
+5V
R18
GROUND
1
45KR15 11
IC10.5
10 74
5116Q13.1
P23
P36
Control PWB
SG
DLUD1
CN3.1
CN3.2
CN3.3
CN1-7
CN2.7
CN1.8
R1
Interfeice PWB
CN1.10
CN2.7
CN1.1
10
7
1
+5V
R115K
GROUND
R5 1
IC8.1
2 60P74
Control PWB
CN-3
CN-2
CN-1
DLUD1-A
DLUD1-SIG
DC5V
DLUD1-SIG
SG
DLUD1-SIG
SG
+5V
100DLUD1-SIG
DLUD1-A
SG
DC5V
11 – 35
(c) Lift motor speed sensor (E1CLK, E2CLK), paper quantity sensor (RESTR, F), and side sensor (DDOP) input circuitsThe lift motor speed sensor detects the rotation of the lift motor and consists of a slit disk and a photo interrupter. When the motor begins rotating,the sensor sends pulse signals. The paper quantity sensor detects the remaining quantity of paper inside the 3000-sheet LCC by checking theheight of the lifter plate of the 3000-sheet LCC. It consists of a screen and a photo interrupter. The truth table of the paper quantity sensor is shownbelow. The side sensor detects the opening of the cover which is opened to remove a paper jam in the longitudinal sheet feed path. The speedsensor, paper quantity sensor and side sensor have the same circuit configuration as the limit sensor as shown in (b).
Table 1 Remaining amount sensor
Remaining quantity of sheets: 0 - 750 sheets Remaining quantity of sheets: 750 - 1500 sheets
RESTR, FScreen plate ON Screen plate OFF
Signal level Lo (0 V) Signal level Hi (5 V)
(d) Resist sensor (DPOD1, 2) input circuitThe resist sensors are photo interrupters located just in front of the roller in the sheet feed path to the PPC, to which the paper is discharged fromthe 3000-sheet LCC and the 500-sheet cassette. Each resist sensor has a lever. The reach of the paper transported can be detected by pushing thelever to displace it out of the slit. DPOD1 and DPOD2 have the same circuit configuration. Here, DPOD1 is used to explain their circuit configuration.Inside the photo interrupter, an LED and a photo transistor (open collector output) are contained. The LED always emits light by using the currentlimited by R25. When the lever enters the photo interrupter’s lit, the infrared light emitted from the LED is shut out to turn the photo transistor off(output high impedance). At this time, the signal at DPOD1 is made at the high level (5 V) by R69. When the lever comes out of the slit, the phototransistor turns on to make the signal at DPOD1 at the low level (0 V). R70 and C15 are noise filters and IC8.4 shapes the input waveform.
(e) Size switch (SIZESW) input circuitThe size switch is a 3-contact slide switch which switches over the paper sizes (A4, B5, and LTR) to be used for the 3000-sheet LCC. It is locatedon the front left frame. Three types of signals are used. When turned on, the signals become a high level (5 V). The three signals are converted into2-bit ones by IC6.2 and 6.3. R16, 17 and 21 are pull-down resistances, and R22, 23 and 24 are input protection resistances. Table 3.2 shows thetruth table of this circuit.
Table 2 Truth table
P67 P66 CN9-2 CN9-3 CN9-4
B5 Hi Lo Hi Lo Lo
A4 Hi Hi Lo Hi Lo
Letter Lo Hi Lo Lo Hi
R6915K
+5V
LED-A
SG
DPOD1
CN-3
CN-1
CN-2
DC5V
DPOD1
SG
CN8.4
CN8.6
CN8.5
Control PWB
GROUNDGROUND
+5V
R25390
4
6
5
R70
1.0K
C152100pF
9877
IC8.4
P26 DPOD1
3Pin+5V CN9.1
Control PWB
GROUND
+5V
47KR23
B5 CN9.2
A4 CN9.3
LETTER CN9.4
1Pin
2Pin
4Pin
7Pin
5Pin
6Pin
8Pin
SIZESW
R2110K
GROUND
R1710K
GROUND
R1610K
47KR22 1
2
3
4
4
5
9
10
IC6.2
IC6.3
620
821
P67
P66
11 – 36
(f) Opening and closing switch (F/LSW) input circuitThe opening and closing switch consists of a micro switch which detects the opening and closing of the 3000-sheet LCC disk, and a mechanicaldevice used to press the switch. The switch turns on when the disk is closed and turns off when it is opened. When the switch turns on, +24 V isapplied on the cathode of ZD2 to let the current flow to the base of Q9, which in turn Q9 turns on to make the F/LSW signal at the low level (0 V).
(g) 500-sheet cassette sensor, switch input circuit (UCSS1 ∼ 4, LUD1, PED2, PFNUD) and input port expansion IC (IC11)The paper size selector switches (UCSS1 ∼ 4) detect the size of the paper fed from the 500-sheet cassette. The paper surface sensor (LUD1) is aphoto interrupter which forms to signal to control the hopper motor until the paper surface is lifted to the sheet feed position. The sensor (PED2) is aphoto interrupter which detects the presence of the paper. Both LUD1 and PED2 consist of a lever and a photo interrupter and are arranged in the500-sheet cassette. The pull-up resistance establishes the logic of the signal. The serial resistance is used to protect IC11.These signals (excluding PFNUD), side sensor (SIDE), and disk opening and closing sensor (F/LSW) are incorporated into the input port of IC11.IC11 converts the entered parallel signal into the serial signal, and outputs it synchronously with CLK. CLK is outputted from the P32 of the CPUand incorporated into the CLK input terminal of IC11. IC10-4 matches the CLK logic. IC11 latches the parallel input signal at the fall at the S/Lterminal and outputs each sensor signal serially from the Oh terminal by synchronizing with CLK. This serial signal is incorporated into the inputterminal of the CPU where it is used for each sensor.
B. Drive system control circuit(a) Sheet feed motor speed control circuit (HMOT)This circuit controls DC brush motor which is used to feed the paper. It consists of a sub-circuit which generates pulses by which the CPUrecognizes the motor speed, and a sub-circuit which drives the motor by PWM output corresponding to the pulse (PLS). The motor is composed of arotor and a board on which the pulse (PLS) generating circuit and driving circuit are mounted. The PWM output is delivered from the CPU. The CPUboard and the motor board are interfaced by the power supply (24 V, 5 V), GND, PLS and PWM signals.
1 Coil switching sensorH1, 2, and 3 are magnet sensitive devices (hole devices) and judge the polarity of the main magnetic flux when the rotor rotates. They generate thesignal by which the conduction of the coil is changed over.
2 Coil switching control circuitThis circuit converts the coil switching signal (weak analog signals around 2.5 V) generated by H1. 2 and 3 into the high and low level judgementsignals inside IC1, thus generating another coil switching signal. The logic diagram of IC1 is Table 3.3.
3 Motor driver circuit sectionA 3-phase bridge circuit is composed of Q1 ∼ 6, to feed current to the motor coil (U, V and W phases). Q7 ∼ 9 are pre-drivers for Q4 ∼ 6. The On/Offtiming of Q1 ∼ 6 are indicated by the output area of the logic diagram of 2 , with H showing the ON timing. IC3-1 ∼ 3 pins are ORed with the outputsignal from IC1 and the PWM signal from the CPU to turn on and off Q4 ∼ 6 for speed control. IC3.4 is a protective circuit which stops the motorwhen the connector’s connection is defective.
4 Pulse signal (PLS) generating circuitA sine-wave-like induced voltage is generated at both ends of the board pattern under the rotor when the magnet inside the rotor passes thepattern. This micro voltage of sine wave is amplified by IC2.2 and its waveform is shaped into the pulse wave by IC2.1.
5 PWM signal generating circuitThe PWM signal is generated by the CPU comparing the PLS signal and the reference CLK which is generated inside the CPU. If the PLS signal isfaster than the reference CLK, the motor is regarded as rotating faster than the specified speed and thus the PWM signal’s duty ratio is suppressedto decelerate the motor.If the PLS signal is slower than the reference CLK, the motor is considered to be rotating slower than the specified speed, the PWM signal’s dutyratio is accelerated to speed up the motor.
GROUND
CN-1
CN-2
F/LSW
CN6.5
CN6.4
DC24V
F/L_I/L
CN1.1
CN2.4
Interfeice PWB
DC24V
F/L_I/L
CN1.1
CN2.4
DC24V
F/L_I/L
Control PEB
IC11
PI14
R4710K
+5V
Q9
ZD212V
DC24V
1
4
11 – 37
Table 3 Logic Diagram
Symbol Pin No. 1 2 3 4 5 6
Input
HA+ 18 H H L L L L
HA– 17 L L H H H L
HB+ 16 L H H L L L
HB– 15 H L L L H H
HC+ 14 L L L H H H
HC– 13 H H H L L L
Output
UH 7 L L H H L L
VH 8 L L L L H H
WH 9 H H L L L L
UL 12 H L L L L H
VL 11 L H H L L L
WL 10 L L L H H L
(b) Lift motor driving circuitThe bundle of sheets of paper is lifted up by the lift-up motor to make the paper height in the 3000-sheet LCC disk suitable for sheet feeding. Thelift-up motor is driven by the lift motor driving circuit. There are two sets of lift-up mechanisms, each of which has a motor (E1MOT, E2MOT) anddriving circuit. The two sets of mechanisms have the same design. Below is the explanation of the E1MOT.The lift motor is turned on and off by theCPU. When the level sensor 1 (LS1) described previously turns off during the passage of paper, the CPU turns on the lift motor (E1MOT) to try toturn on the sensor. The ON signal (low level) is outputted from the IC1-15 pin. This signal is ORed with the limit sensor 1 (LMS1, high level at limit)so that it is outputted from the IC6-3 pin only when the limit sensor 1 is off (low level). When the IC6-3 pin is at the low level, no current is suppliedto the base of Q4 to turn it off. This supplies current from R79 to the base of Q5 to turn it on, so that CN6.1 pin becomes about 0 V, thus producingvoltage differential across both poles of the motor to supply current to the motor. When the paper surface is detected by the level sensor, the IC1-15pin become a high level to turn Q5 off. At this instance, there occurs a potential difference between the base and emitter of Q1 to turn Q1 on, thusapplying regeneration brake. D1 is also a flywheel diode which operates when it is off.
Control PWB
GROUND
GROUND GROUND
DC24V CN5.1
PG CN5.2
CN5.3
DC5V CN5.4
HMOT_CLK CN5.5
HMOT_SIG
1
2
3
4
5
DC24V
C1010µF
++ C91µF
C81000pF
R62
1.0K
72P21
47P10
+5V
R6110K
13 12 1 2
IC8.6 IC13.1
+5V
+5V
R6310K
GROUND
Q4
DC24V CN6.2
E2MOT CN6.1
CN-1
CN-2
E1MOT
Control PWBAGROUND
2
1 IC6.13
15P03
+5V
R81 10K
LMS1
R791.0K
Q5
+5VR194.7K
D4
Q11
D1
DC24V
2
1
11 – 38
(c) Pick-up clutch (P1CL, P2CL), break-up clutch (BCL), and resist clutch (RCL) driving circuitsThe pick-up clutch transmits the power of the sheet feed motor (HMOT) to each roller. The pick-up clutch (P1CL, P2CL), break-up clutch and resistclutch (RCL) have the same type of circuit. The pick-up clutch 1 (P1CL) driving circuit is explained as an example.Q13 (TD62003) is a Darlington driver containing 7 circuits, one of which is used for driving. When the IC1-19 pin becomes a high level, the transistorat the Q13.4’s output stage turns on and the IC13-13 pin becomes about 0 V, to supply current to the clutch to turn it on, thus transmitting the powerfrom the sheet feed motor.
C. Other circuits
(a) Reset circuitThe reset circuit generates the reset signal for the CPU, and consists of an IC5 and its peripheral circuit. IC5 integrates reset functions, such aspower-on reset when the power is turned on, CPU reset when an abnormal drop of +5V occurs, and watch dog timer. When the power line (+5V) is at about 0.8 V after the power is turned on, IC5 begins to operate. The IC5-8 pin becomes a low level to reset theCPU and hold this state for a specified duration (about 100 ms) which is determined by C13’s capacity after the power line reaches about 4.3 V.When the specified reset holding time has passed, the IC5-8 pin becomes a high level to release the reset, thus putting the CPU in action. When the power line drops to about 4.2 V, the IC5-8 pin becomes a low level to reset the CPU. This state is released at 100 ms after the power linereaches 4.3 V.The IC5-3 pin is a clock input terminal for the watch dog timer, into which regular pulse signals of 10 ms cycle are entered. If this signal stops due toa hung-up CPU or for any other reason, the IC5-8 pin becomes a low level a specified time later to reset the CPU. The clock watch time is set forabout 100 ms based on the capacity of C13.It is also possible to hardware reset through the communication cable from the PPC. In this case, hardware resetting is achieved by putting theCN3.6 pin at a high level or opening it. IC9.1 and 2 are logical pairs, and IC13.3 is an open collector element which synthesizes the reset output and hardware reset signal for IC5.
DC24V
P1CL
CN1.2
CN1.6
DC24V
P1CL
DC24V
P1CL
Interfeice PWB
DC24V
P1CL
CN1.2
CN1.6
CN1.2
CN1.6
Control PEB
DC24V
2
6 P1CL13419P07
Q13.4
GROUND
C121000pF
7
VS
+C131µF
C280.1µF
+5v
5
4
2
3
8
1
6
D3
RKS
CK
*RES
CT
VREF
VCC
GND
IC5MB3773
+5v+5v
R7110K
R7310K
GROUND
C141000pF
1 2
IC9.1
3 4
IC9.2
5 6
IC13.3
GROUND
C30.022µF
6
+5v
R3510K
D-RESCN3.6I/F coble
7 25
RESET P62
11 – 39
[12] Functions of PPC communication system (Option)
1. General description
The system is designed to improve efficiency in servicing, customers control, and working rate of machines by remotecontrol of meter reading, remote diagnosis, read/write of various adjustment values by the host computer usingtelephone lines. The communication unit systems are largely classified into two: system A and system B. In system A, counting of thecounter based on the pulse signal output from the copier for every copy. In system B, a wider range of information canbe controlled such as counter totalizing, troubles, jam, remote maintenance, and marketing data.
2. System A
[Fig. 1] Block diagram
In system A, the personal counter signal (count up pulse) output from the copier is sensed and counted up. The dataare written into the RAM which is backed up by a battery. Since in internal RTC (Real Time Clock) is provided, thecount data are transmitted (usually at night) through the telephone line to the host computer when the time set in theRAM is reached. System A can be used even with a low cost copier machine and a telephone line which has already been installed bythe user, the communication is one way from the terminal to the host.
(1) Functions of System A
System A provides the following functions:(1) Meter reading by periodic transmission(2) Sense switch of start and end time of servicing
ROM(1MB)
RAM(32KB)
RTC
PPC
SW
SW
CPU
NCU
LIN
TEL
AC/DC
Telephone Line
Telephone
Count input
Copierinterface
Communi-cationcontrolsection
Power control
AC adapter
12 – 1
3. System B
[Fig. 2] Block diagram
System B is designed for medium class or high class copiers. Communication in system B is performed with the linespecially provided for this system or by sharing the existing telephone line. When the special line is provided, thebi-directional communication is allowed, where either the host or the terminal can start communication. When theexisting telephone line is used, communication is made only from the terminal similar to system A.The communication unit process and stores information sent from the copier every time copy is completed or a jam ora trouble occurs. The data are sent to the host computer when an access is made from the host computer. It is alsopossible to make an access to the host computer to transmit information by using trouble data transmission from thecopier as a trigger.
ROM(1MB)
RAM(32KB)
RTC
SW
SW
CPU
NCU
LIN
TEL
AC/DC
Telephone Line
Telephone
RS-232CCopierinterface
Communi-cationcontrolsection
Power control
AC adapterPPC
(1) Functions and applications of system B
Function UserServiceengineer
Dealer Subsidiary
1 Automatic billing (meter reading) F F
2 Automatic service call F F k
3 Jam history read F F k
4 Trouble history read F F k
5 Read/write of simulation data F F k
6 Supply parts stock control F F k
7 Machine status check F F F k
8 Copy inhibition when PC/modem is not installed F k
: Not applicable F: Applicable k: Applicable if required
12 – 2
All the functions of system B are listed in the table below:
Function Data content
1 Automatic billing (meter reading)
Cou
nter
by
func
tion
Total
• The counter value of each data listed in the rightcolumn can be automatically read through thetelephone line, and also can be read by theperiodic transmission started by the terminal.
Maintenance
Duplex
Staple
ADF
Tray 1
Tray 2
Trouble
Jam in PPC body
Manual feed tray counter
Desk tray 1 counter
Desk tray 2 counter
Desk tray 3 counter
DV
cou
nter
DV counter (Black)
2 Automatic service call
S
tatu
s da
ta
At initializing after power ON or cancellation ofsimulation.• When a trouble occurs or in the case of
maintenance, a trouble code and the status dataimmediately before occurrence of the trouble orthe service code are automatically transmitted. Forthe trouble codes, refer to the Service Manual ofthe copier. For status data and service codes,refer to the column in the right.
Simulation No. input wait state.
During execution of simulation .
Trouble state
Jam state
Door open state
Warm up state
During copying
Wait state
Power OFF state
Ser
vice
cal
l Maintenance
Developer replacement
K
ey o
pera
tor
call Toner empty
Waste toner full
Toner low (Little toner left)
12 – 3
Function Data content
3 Jam history read
J
am p
ositi
on c
ode
Desk
• Data on sensor names and sensor positions,document size, paper size, and the paper feed unitwhen jams occurred can be read.
Main body cassette
Separation
Paper exit
Sorter
Duplex
ADF
4 Trouble history read
Sta
tus
data
At initializing when power ON or after cancellation ofsimulation• When a trouble occurs, the trouble code and the
status code just before the occurrence can beread.For the trouble codes, refer to the Service Manualof the copier. For the status data just before theoccurrence of the trouble, refer to the right column.
Simulation No. input wait state
During execution of simulation
Trouble state
Jam state
Door open state
Warm up state
During copying
Wait state
Power OFF state
5 Read/write of simulation data For the contents of data for simulation, refer to theService Manual of the copier.• Simulation data (set values, etc.) of each copier
can be read and simulation can be executed. Forthe contents of simulations, refer to the Servicemanual of the copier.
12 – 4
Function Data content
6 Supply parts stock control
Toner empty
• Information on the total copy quantity and tonerempty state are sent from the copier to checksupply parts history information every time copyingis completed.
K
ey o
p. c
all
T
otal
cop
y
Copy quantity
Cop
y m
ode
Orig
inal
han
dlin
g un
its
OC
Dup
lex
mod
e S to S
S to D
D to S
D to D
(R) ADF
Dup
lex
mod
e S to S
S to D
D to S
D to D
RDH
Dup
lex
mod
e S to S
S to D
D to S
D to D
CFFD
uple
x m
ode S to S
S to D
D to S
D to D
UDH
Dup
lex
mod
e S to S
S to D
D to S
D to D
7 Machine status check
Sta
tus
data
At initializing when power ON or after cancellation ofsimulation• Machine status data listed in the right column can
be checked. Simulation No. input wait state
During execution of simulation
Trouble state
Jam state
Door open state
Warm up state
Copy state
Wait state
Power OFF state
12 – 5
Function Data content
8 Copy inhibition when PC/modem is not installed
Cop
y en
able
/ Cop
y in
hibi
tion
Copy stop• As shown in the right, selection can be made
between copy inhibition and copy enable.
• Copy inhibition (PF trouble) mode can becancelled with simulation of the copier.
• When PC/modem is not installed or in case ofcommunication trouble between PC/modem andthe copier, selection between copy inhibition andcopy enable can be made with the copiersimulation.
Copy stop cancel
4. Communication system I/F PWB
In the SF-2040, the communication system I/F PWB is attached to the copier as required. Communication system I/F PWB unit ass’y: SF-23IA (CPLTM4130FC53) Fixing screw (M4-10) : XHBSD40P10000
(Installing procedure)
1 Remove the rear cabinet of the copier body.
2 Install the I/F PWB unit to the main body frame.
3 Connect the 15-pin connector.
4 Simulation 27-01 settingIn case of communication trouble trouble code U7-00 is display (YES/NO)Factory setting: Display NO
5 Attach the rear cabinet.
12 – 6