me-50 service notes english - el34 world

SERVICE NOTES

Issued by RJA

Copyright © 2003 ROLAND CORPORATION

All rights reserved. No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION.

Printed in Japan (0800) (AS)17058813E0

Feb.2003 ME-50

SPECIFICATIONS.............................................................2LOCATION OF CONTROLS ..........................................4LOCATION OF CONTROLS PARTS LIST ...................4EXPLODED VIEW ............................................................6EXPLODED VIEW PARTS LIST .....................................8PARTS LIST......................................................................10CHECKING THE VERSION NUMBER.......................13

RESTORING THE FACTORY SETTINGS...................13TEST MODE.....................................................................13BLOCK DIAGRAM.........................................................20CIRCUIT BOARD............................................................22CIRCUIT BOARD............................................................24CIRCUIT DIAGRAM......................................................26

TABLE OF CONTENTS

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Feb.2003

SPECIFICATIONSME-50: Guitar Multiple Effects

AD Conversion24 bit + AF method (*)

DA Conversion24 bit

Sampling Frequency44.1 kHz

Patches30 (user)

EffectsTone Modify

Compressor

Overdrive/Distortion

Chorus

Phaser

Flanger

Harmonist

Tremolo

Pan

Vibrato

UNI-V

Rotary

Delay

Reverb

Noise Suppressor

(Effects for Expression Pedal)

Foot Volume

Wah

Resonance

Voice

Ring Modulator

Bend (+1 OCTAVE, -1 OCTAVE)

Nominal Input LevelINPUT: -10 dBu

AUX IN: -10 dBu

Input ImpedanceINPUT: 1 M ohms

AUX IN: 100 k ohms

Nominal Output Level-10 dBu

Output Impedance2 k ohms

Display7 segments, 1character LED

JacksINPUT jack

GUITAR AMP jacks L(MONO)/R

AUX IN jack (Stereo Mini type)

PHONES/LINE OUT jack

AC Adaptor jack

Power SupplyDC 9 V: Dry batteries (R6/LR6 (AA) type) x 6, AC Adaptor (PSA series: Optional)

Current Draw120 mA

* Expected battery life under continuous use:

Carbon: 3.5 hours

Alkaline: 12 hours

These figures will vary depending on the actual conditions of use.

Dimensions384 (W) x 225 (D) x 102 (H) mm

15-1/8 (W) x 8-7/8 (D) x 4-1/16 (H) inches

Weight3.15 kg / 7 lbs (including batteries)

AccessoriesOwner’s Manual ENGLISH :(#G6017362)

JAPANESE :(#G6017361)

Dry Batteries (Alkaline: LR6 (AA) type) x 6:(#********)

OptionsAC Adaptor: BOSS PSA series

Foot Switch: BOSS FS-5U

* 0 dBu = 0.775 Vrms

* In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.

* AF method (Adaptive Focus method)This is a proprietary method from Roland that vastly improves the signal-to-noise (S/N) ratio of the A/D and D/A converters.

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ME-50

5

Feb.2003 ME-50

LOCATION OF CONTROLS

fig.panel

1

2,4

3,4

15,6,18

2,4

3,4

1

7

8

9 10 11,4

13

12

1415,1617,18

19202122232425

26 27 28

29

LOCATION OF CONTROLS PARTS LIST

NO PART CODE PART NAME DESCRIPTION1 1502928100 LED (RED) L-34HDSL2 F3279803 POTENTIOMETER 11 CLICKS 50KB RD901-40-125F-B54-11D3 F3279802 POTENTIOMETERNO CLICK 50KB RD901-40-125F-B54-00D4 G2477122 R-KNOB5 F5029117 LED L-312LRD6 G247751001 VGA KEYTOP S BLACK WITH LENS7 G2027904 TOP COVER8 G2187193 BOTTOM COVER9 G2187602 SWITCH PEDAL10 G2227301 PEDAL ESCUTCHEON11 F3279804 POTENTIOMETER 6 CLICKS RD901-40-125F-B54-06D 50KB12 G2187547 VR PEDAL13 G2357125 PEDAL PLATE14 15029106 LED LD002VB

15 G2047001 7SEG COVER16 F5029408 LED A-601H17 G247751301 VGA KEYTOP S WITHOUT LENS18 F3129306 SWITCH SKQKAB19 G1147002 REAR PANEL20 13449155MF PHONE JACK (MONO) HTJ-064-12I21 13449440 JACK HSJ0857-01-21022 13449150MF PHONE JACK (STEREO) HTJ-064-12D23 F3159111 SLIDE SW SK22F0224 F3449717 JACK HEC2392-01-15025 F2367103 CORD HOOK26 G2217733 PEDAL LABEL (OD/DS)27 G2217734 PEDAL LABEL (MOD)28 G2217735 PEDAL LABEL (DELAY)29 F3279782 POTENTIOMETER RK11K1140(10K SPECIAL B-CURVE)

NO PART CODE PART NAME DESCRIPTION

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Feb.2003

EXPLODED VIEW

fig.explo1

7

ME-50

fig.explo2

8

Feb.2003

EXPLODED VIEW PARTS LIST

[PARTS]

[SCREWS]

NO PART CODE PART NAME DESCRIPTION1 G2027904 TOP COVER2 G2187193 BOTTOM COVER3 G1147002 REAR PANEL4 G2047001 7SEG COVER5 G2187547 VR PEDAL6 G2187910 PEDAL HOLDER7 G2147119 BOLT HOLDER8 G2357125 PEDAL PLATE9 G2357122 REAR CUSHION10 G2357111 CUSHION R11 G2147806 STAY12 G2217733 PEDAL LABEL (OD/DS)13 G2217734 PEDAL LABEL (MOD)14 G2217735 PEDAL LABEL (DELAY)15 G2227301 PEDAL ESCUTCHEON16 G2187602 SWITCH PEDAL17 G2177103 SUPPORT SPRING18 G2357126 PEDAL FOOT H=7.619 G247751001 VGA KEYTOP S BLACK WITH LENS20 G247751301 VGA KEYTOP S WITHOUT LENS21 G2477122 R-KNOB22 F2367103 CORD HOOK23 G2357120 FOOT H=524 G2017617 BATTERY CASE25 G2027602 BATTERY COVER26 G2177304 BATTERY TERMINAL (+ -)27 G2177305 BATTERY TERMINAL (+)28 G2177306 BATTERY TERMINAL (-)29 75E013P000 MAIN SHEET ASSY30 F3467025 WIRING 2PMAIN SHEET ASSY includes the following parts. 31 ******** EXP BOARD ASSY

NO PART CODE PART NAME DESCRIPTIONa H5039521 VR ACCESSORY NUT M7b H5039520 M9 NUTc H5039126 M9 WASHERd H5039514 NUT M6 HSJ-0999-01-190e H5039121 WASHER 9.5X6.5 HSJ-0999-01-210f H5039510 NUT M9X12X2 FENIg H5039112 WASHER M9h H5029331 SCREW 3X8 BINDING S-TIGHT FEBCk H5029332 SCREW 3X6 BINDING S-TIGHT FEBZCm H5029308 SCREW 3X10 BINDING S-TIGHT FEBCn H5029330 SCREW M3X8 BINDING TAPTITE P BZCo H5019124 SCREW M3X6 PAN MACHINE W/SW+SMALL PW ZCp H5019130 SCREW M3X6 PAN MACHINE W/SW+PW ZCq H5029867 HEX BOLT M6X70 HALF THEREAD BZr H5039122 PLAIN WASHER 6X13X1 BZCs H5039515 NUT M6 U BZCt H5019154 SPRING WASHER 6X12X1u H5039111 PLAIN WASHER 3X8 ZC

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10

Feb.2003

PARTS LISTfig.part1e

CASING# G2047001 7SEG COVER 1 G2017617 BATTERY CASE 1 G2027602 BATTERY COVER 1# G2187193 BOTTOM COVER 1 G2227301 PEDAL ESCUTCHEON 3# G1147002 REAR PANEL 1 G2187602 SWITCH PEDAL 3# G2027904 TOP COVER 1# G2187547 VR PEDAL 1

CHASSIS# G2187910 PEDAL HOLDER # G2147806 STAY 1

KNOB,BUTTON G2357120 FOOT H=5 4# F2367103 CORD HOOK 1 G2477122 R-KNOB 20 G247751001 VGA KEYTOP S BLACK WITH LENS 1 G247751301 VGA KEYTOP S WITHOUT LENS 4

SWITCH 13129778 SKQKAH TACT SWITCH SW7,8,9 3# F3129306 SKQKAB SWITCH SW1,2,3,4,6 5# F3159111 SK22F02 SLIDE SW SW5 1

JACK,EXT TERMINAL 13449150MF HTJ-064-12D PHONE JACK (STEREO) JK6,4 2 13449155MF HTJ-064-12I PHONE JACK (MONO) JK1,2,3 3# F3449717 HEC2392-01-150 JACK JK7 1 13449440 HSJ0857-01-210 JACK JK5 1

PWB ASSY# 75E013P000 MAIN SHEET ASSY 1

IC 01672634 TC74HC4052AFT(EL) IC TTL IC4,7,10 3 15209102 M51957BFP IC (SYSTEM RESET) IC3 1# F5199110 S-81233SGY IC (REGURATOR) IC19 1# F5289101 NJM2100M 8P SOP IC (OP.AMP) IC2 1# 03123889 HD6433687 IC (MASK CPU) IC11 1# F5279309 BU2090F-E2 IC (LED DRIVER) IC16,17 2# F5179607 CAT24WC32J IC (EEPROM) IC15 1 02231767 RA0A-101 (TC223C080AF-101) IC (DSP) IC8 1# F5279520 LC32V4265T-25-TLM IC (DRAM) IC12 1# 03123901 LT1616 IC (DC-DC) IC14 1 15189261 M5218AFP-600E IC (BIPOLAR OP AMP) IC1,5,18 3 01125012 NJM4556AM IC (BIPOLAR OP AMP) IC6 1 02451434 AK4552VT IC (AD/DA) IC3 1

TRANSISTOR 15309104 2SA1586-GR(TE85R) TRANSISTOR Q6 1 15319107 2SC4116-GR(TE85R) TRANSISTOR Q9 1 15319115 2SC4213-A(TE85L) TRANSISTOR Q2,3,4,5 4 15329103 2SK880GR-TE85R FET TRANSISTOR Q1 1

SAFETY PRECAUTIONS:The parts marked have safety-related characteristics. Use only listed parts for replacement.

CONSIDERATION ON PARTS ORDRINGWhen ordering any parts listed in the parts list, please specify the following items in the order sheet.

QTY PART NUMBER DESCRIPTION MODEL NUMBEREx. 10 22575241 Sharp Key C-20/50

15 2247017300 Knob (orange) DAC-15DFailure to completely fill the above items with correct number and description will result in delayed or even undelivered replacement.

NOTE: The parts marked # are new. (initial parts)

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ME-50

DIODE 1502928100 L-34HDSL LED (RED) LED2,3,6,79,10,11,12,13,14,15,16,17,19,20,21 16 15029106 LD002VB LED LED4,8 2# F5029408 A-601H LED LED5 1 F5029117 L-312LRD LED LED18 1 15339119 1SS-352 DIODE D1,3,5,6 4 F5339137 SS14 VF=0.45V DIODE D4,7 2

RESISTOR F5419707 CRN34101J RESISTOR ARRAY RA1,2,3,4,6 5 F5419705 CRN34103J RESISTOR ARRAY RA7,9 2 F5419726 CRN34473J RESISTOR ARRAY RA8,10,11 3 F5429366 15K OHM F RANK (1%) RESISTOR (CHIP) R79 1# F5399914 6.8KF RESISTOR R82 1 F5399951 68(1/2W) CHIP RESISTOR R39,52 2 F2569127 MINISMDC075 POLY SWITCH R80 1 00566867 RPC05T 100 J MTL.FILM RESISTOR R33,70 2 00567023 RPC05T 101 J MTL.FILM RESISTOR R20,61,100 3 00567156 RPC05T 102 J MTL.FILM RESISTOR R9,10,26,27 4 00567289 RPC05T 103 J MTL.FILM RESISTOR R1,2,5,6,7,13,16,21,22,28,29,35,36,38,42,46, 30 00567412 RPC05T 104 J MTL.FILM RESISTOR R12,63 18 00567556 RPC05T 105 J MTL.FILM RESISTOR R12,R63 2 00567167 RPC05T 122 J MTL.FILM RESISTOR R101 1 00567290 RPC05T 123 J MTL.FILM RESISTOR R86,89 2 00567301 RPC05T 153 J MTL.FILM RESISTOR R4 1 00567190 RPC05T 222 J MTL.FILM RESISTOR R85 1 00567078 RPC05T 271 J MTL.FILM RESISTOR R102,103,104,105,106,107,108,109 8 00567334 RPC05T 273 J MTL.FILM RESISTOR R95,99 2 00567089 RPC05T 331 J MTL.FILM RESISTOR R122 1 00567345 RPC05T 333 J MTL.FILM RESISTOR R3,11,23,77,78,81,84,87,88,138,139,141,145,1 2 00566967 RPC05T 470 J MTL.FILM RESISTOR R83,91 2 00567112 RPC05T 471 J MTL.FILM RESISTOR R94,112 2 00567245 RPC05T 472 J MTL.FILM RESISTOR R17,32,44,56,58,59,140,142 8 00567378 RPC05T 473 J MTL.FILM RESISTOR R15,31,37,40,41,45,47,48,51,54,55,60,129,133 14 00567256 RPC05T 562 J MTL.FILM RESISTOR R127,131 2 00567134 RPC05T 681 J MTL.FILM RESISTOR R92,93,110,111,113,114,115,116,117,118,119,

116

F5429365 10K OHM F RANK (1%) CHIP RESISTOR R24 1 F5429386 150K F (1608TYPE) CHIP RESISTOR R18 1

POTENTIOMETER F3279802 RD901-40-125F-B54-00D POTENTIOMETERNO CLICK 50KB VR3,4,6,7,8,10,11,12,13,14,15,18,19,20,21 15 F3279804 RD901-40-125F-B54-06D 50KB POTENTIOMETER 6 CLICKS VR2 1 F3279803 RD901-40-125F-B54-11D POTENTIOMETER 11 CLICKS 50KB VR5,9,16,17 4# F3279782 RK11K1140(10K SPECIAL B-CURVE POTENTIOMETER VR1 1

CAPACITOR F5349704 ECPU1C474MA5 0.47 MYLAR CAPACITOR (SUBMICRON) C4 1 F3629110 100U/16V (H=7MM) CHEMICAL CAPACITOR C5,28,39,54,76,85,107,108,111,113,117,119,12 19 F3629700 10U/16V (H=7MM) CHEMICAL CAPACITOR C2,9,10,11,12,16,19,20,22,23,24,25,31,42,49, 17 01674612 ECJ1VB1H103K CERAMIC CAPACITOR C116 1# 01674501 ECJ1VB1H182K CERAMIC CAPACITOR C37,53 2 01674512 ECJ1VB1H222K CERAMIC CAPACITOR C1,7,14 3 01674712 ECJ1VF1A105Z CERAMIC CAPACITOR C130 1 01674701 ECJ1VF1E104Z 0.1UF/16VK CERAMIC CAPACITOR C18,26,29,30,32,34,38,45,46,47,48,59,60,61,6 58 01674167 ECUV1H100DCV CERAMIC CAPACITOR C3,8,21,35,36,51,52,128,129 9 01674467 ECUV1H102JCV CERAMIC CAPACITOR C95 1 01674189 ECUV1H120JCV CERAMIC CAPACITOR C100,101 2 01674356 ECUV1H151JCV CERAMIC CAPACITOR C44,58 2# F3629708 0.22U/50 CAPACITOR C56,41 2# F3629701 1/50 CAPACITOR C33 1# F3629703 47/16 CAPACITOR C66 1

INDUCTOR,COIL,FILTER F5409131 QT04-60 EMI L1 1# F2449226 SLF7032T-100M 10UH COIL L3 1

CRYSTAL,RESONATOR F5299306 HC-49SM 10.000MHZ CRYSTAL X1 1 02672401 SG-8002JC 67.7376MHZ PC CRYSTAL X2 1

CONNECTOR F3439123 A2001WR2-3P CONNECTOR 3P CN2 1 F3439160 53015-0210 2P P=2MM CONNECTOR CN3 1

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Feb.2003

WIRING,CABLE# F3467025 WIRING 2P 1# F3467024 WIRING 3P 1

SCREWS H5039111 WASHER D8D3T0.5 ZC 2# H5039515 NUT M6 U BZC 1 H5019124 SCREW M3X6 PAN MACHINE W/SW+SMALL PW ZC 8 H5019130 SCREW M3X6 PAN MACHINE W/SW+PW ZC 8# H5039121 WASHER 9.5X6.5 HSJ-0999-01-210 # H5039514 NUT M6 HSJ-0999-01-190 # H5029867 HEX BOLT M6X70 HALF THEREAD BZ 1 H5039510 NUT M9X12X2 FENI for Phones Jack 5# H5029330 SCREW M3X8 BINDING TAPTITE P BZC 6 H5029332 SCREW 3X6 BINDING S-TIGHT FEBZC 6 H5029308 SCREW 3X10 BINDING S-TIGHT FEBC 1 H5029331 SCREW 3X8 BINDING S-TIGHT FEBC 10# H5039122 PLAIN WASHER 6X13X1 BZC 1# H5019154 SPRING WASHER 6X12X1 1 G2147119 BOLT HOLDER 2 H5039520 M9 NUT with VR RK11K1140 1 H5039126 M9 WASHER 1 H5039521 VR ACCESSORY NUT M7 with VR RD901-40 20 H5039112 WASHER M9 for Phones Jack 5

PACKING# G2627753 PACKING CASE 1# G2267501 PAD L 1# G2267502 PAD R 1

MISCELLANEOUS# G2199505 LED SPACER LED-7A 15# G2199506 LED SPACER LED-15A 3# G2357126 PEDAL FOOT H=7.6 3# G2217733 PEDAL LABEL (OD/DS) 1# G2217734 PEDAL LABEL (MOD) 1# G2217735 PEDAL LABEL (DELAY) 1 G2177304 BATTERY TERMINAL (+ -) 2 G2177305 BATTERY TERMINAL (+) 1 G2177306 BATTERY TERMINAL (-) 1 G2357111 CUSHION R 1 G2147127 DC JACK HOLDER 1# G2357125 PEDAL PLATE 1 G2357122 REAR CUSHION 2 G2177103 SUPPORT SPRING 3

ACCESSORIES (Standard)# G6017361 OWNER’S MANUAL JAPANESE # G6017362 OWNER’S MANUAL ENGLISH 1 40232389 WARRANTY CARD FOR BOSS JAPAN ONLY

13

ME-50

CHECKING THE VERSION NUMBER

• Device Settings

Turn the VR knobs (pots) completely to the left (minimum).

• Hold down the [EDIT/EXIT] switch and [WRITE] switch and turn the POWER switch on.

Press the [FOOT 1] switch.

If the version number is Ver.1.01, the “b” (flat symbol) LED lights up, and “1” appears in the seven-segment LED. fig.test-4_70

RESTORING THE FACTORY SETTINGS

• Hold down the [WRITE] switch and [ ] switch and turn the POWER switch on.

“F” appears in the seven-segment LED.

• Press the [WRITE] switch. The BANK LED flashes.

• Press the [WRITE] switch. The seven-segment LED and BANK LED flash, and the factory data is loaded.

The dot in the seven-segment portion lights, and Factory Reset is completed when the unit switches to Play mode.

Never turn off the power while factory data is being loaded.

TEST MODE

Items to Have On HandOscilloscope (1)

Oscillator (1)

Monitor amps (2)

Noise meters (2)

FS-5U (2)

Open plug

Measuring Equipment Settings

OscillatorWaveform: Rectangular wave

Frequency: 400 Hz

Output Level: 50 mVp-p

OscilloscopeTIME/DIV : 0.5 msec

VOLTS/DIV : 0.2 V

Noise MeterFilter: IHF-A (JIS-A)

Foot Switch (FS-5U)POLARITY SW: Jack

Switching into Test Mode• Device Settings

Turn all VR knobs (pots) completely to the left (minimum).fig.test-2_50


Test Categories1. LED Full Lighting, EEPROM Check

2. LED Lighting Check

3. Key SW, Pedal SW Check

4. External SW Check

5. VR Check

6. EXP Pedal Check

7. DSP Check

8. D/A Circuitry Check

9. DRAM Check

10. INPUT A/D Check, AUX IN Check, Noise Check

11. EXP Pedal Adjustment

Test DetailsSwitch to Test mode.

• Device Settings

Turn all VR knobs (pots) completely to the left (minimum).


1. LED Full Lighting, EEPROM Check• After the test is implemented, with data read from and written to the

EEPROM, all of the LEDs light up.

• Confirm the following.

1. All LEDS are lit.

2. No LED goes off when the unit is subjected to shock.

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Feb.2003

fig.test-3_50

• With all LEDs lit, press the following switches to enable selection of the type of check to start.

Press the [FOOT 1] switch to proceed to the “Version Check.”

Press the [FOOT 2] switch to proceed to “5. VR Check.”

Press the [FOOT 3] switch to proceed to “6. EXP Pedal Check.”

Press the [ ] switch to proceed to “7. DSP Check.”

Press the [ ] switch to proceed to “11. EXP Pedal Adjustment.”

• Version Check

Press the [FOOT 1] switch.

If the version number is Ver.1.01, the “b” (flat symbol) LED lights up, and “1” appears in the seven-segment LED.

After confirming the version, press the [ ] switch to proceed to the LED lighting check.

2. LED Lighting Check• Confirm that the LEDs light up in sequence each the [WRITE] switch is

pressed.fig.test-5_50

Sequence in Which LEDs Light Up

[TONE MODIFY]→[COMPRESSOR]→[NS]→[REVERB]→([b]−>[#])

→[TUNER]→[MEMORY]

→[EACH SEGMENT OF 7-SEGMENT LED]→[PEDAL MODE SW]→[DELAY]→[MODULATION]

→[OVERDRIVE/DISTORTION VARIATION]→[FOOT 1]→[FOOT 2]→[FOOT 3]

→RETURN TO [TONE MODIFY]

• Press the [ ] switch to proceed to the next step.

Note: This will not advance the procedure to the next step unless the cycle has returned to [TONE MODIFY].

3. Key SW, Pedal SW Check• Press the following switches in the indicated sequence.

[WRITE]→[ ]→[EDIT/EXIT]→[ ]→[TYPE VARIATION]→[FOOT 1]→[FOOT 2]→[FOOT 3]

Note: If the incorrect key is pressed inadvertently, the procedure does not advance to the next key unless the correct key is pressed twice.

fig.test-6_50

If no problem exists, the procedure automatically proceeds to the next step.

4. External SW Check• Connect two FS-5U foot switches, one each to the [TONE MODIFY] and

[COMP ON/OFF] jacks.

Set the FS-5U POLARITY switches at the jacks.fig.test-7_70

• Press the [TONE MODIFY] switch (FOOT SW = TIP).

If no problem exists, then “2” appears in the seven-segment display.fig.test-8_70

• Press the [COMP ON/OFF] switch (FOOT SW = RING).


5. VR CheckThe dot in the seven-segment LED appears when the VR is not at the minimum position.fig.test-9_70

(1) Notched VR Check

• Rotate the following VRs (pots) in the indicated sequence.

[TONE MODIFY]→[OVERDRIVE/DISTORTION]→[MODULATION]→[DELAY]→[PEDAL MODE SW]

Note: The notched VRs turn in both directions (clockwise and counterclockwise).

Note: Confirm that what is displayed in the seven-segment LED changes with each notch position.

[TONE MODIFY], [OVERDRIVE/DISTORTION], [MODULATION], and [DELAY] = “0”--”A”

1 2 3 4 5 6 7 8 9

10

11

12131415161718

19

20

2 3 412

5 6 7 8 9

10

11

1320

1419

151618

17

1

875

6

12

34

15

ME-50

[PEDAL MODE SW] = “0”--”5”fig.test-10_50

(2) Non-Notched VR Check

• Rotate the following VRs (pots) in the indicated sequence.

[COMPRESSOR:SUSTAIN]→[COMPRESSOR:LEVEL]→[NS:THRESHOLD]→[REVERB]→[MASTER LEVEL]→[OVERDRIVE/DISTORTION:DRIVE]→[OVERDRIVE/DISTORTION:BOTTOM]→[OVERDRIVE/DISTORTION:TONE]→[OVERDRIVE/DISTORTION:LEVEL]→[MODULATION:RATE/KEY]→[MODULATION:DEPTH/HARMONY]→[MODULATION:E.LEVEL/RESONANCE]→[DELAY:TIME]→[DELAY:FEEDBACK]→[DELAY:E.LEVEL]

Note: Confirm that what is displayed in the seven-segment LED changes with each notch position.fig.test-11_70

fig.test-12_70

fig.test-13_70

fig.test-14_50


6. EXP Pedal Check• Start with the expression pedal in the depressed position.

• Carry out the following operations in the indicated sequence.fig.test-15_70

1. Raise the tip of the expression pedal until it is at its highest point.fig.test-16_70

2. Lower the tip of the expression pedal until it is approximately at the midpoint.fig.test-17_70

3. Once again, press down tip down completely so that the pedal is in the fully depressed position.fig.test-18_70


7. DSP Check• The DSP check is performed automatically.


8. D/A Circuitry Checkfig.test-19_70

• Oscilloscope Settings: Ch1: 0.2 V/div; Ch2: 0.2 V/div; TIME: 0.5 ms/div

• Connect the cable only to the OUTPUT L(MONO) jack, then confirm that the waveform output by OUTPUT L(MONO) changes accordingly, as shown in the figures below.

1

2

3 4 5

1 2 3 4 5

6 7 8 9 10 11 12 13 14 15

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Feb.2003

[Mute Off]fig.test-20_50

[Mute On]fig.test-21_50

• Next, connect the cable to OUTPUT R, then confirm that the waveform output by OUTPUT R changes accordingly, as shown in the figures below.



• Disconnect the cable from OUTPUT R, then confirm that the waveform output by OUTPUT L(MONO) changes accordingly, as shown in the figures below.



Reconnect the cable to OUTPUT R, then confirm that the waveform output by OUTPUT changes accordingly, as shown in the figures below.

[Mute Off]• Confirm that the value for the waveform amplitude is between 380 and

540 (mVp-p).

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ME-50

fig.test-22_50


• Confirm that the LINE/PHONES waveform changes accordingly, as shown in the figures below.

• Confirm that the value for the waveform amplitude is between 600 and 850 (mVp-p).



Press the [ ] switch to proceed to the next step.

9. DRAM Checkfig.test-25_70


• Connect the cable only to the OUTPUT L(MONO) jack, then confirm that the waveform from OUTPUT is smooth, as shown in the figure below.


fig.test-26_50

• Example of bad waveform: waveform is stepped

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Feb.2003

fig.test-27_50


10. INPUT A/D Check, AUX IN Check, Noise Checkfig.test-28_70

(1) INPUT A/D Check

Input a rectangular wave to the INPUT jack only, then check the waveform from OUTPUT.

• INPUT Signal: 400-Hz, 50-mVp-p square wave



fig.test-29_50

(2) AUX IN Check

Input a rectangular wave to the AUX IN jack only, then check the waveform from OUTPUT.

• INPUT Signal: 400-Hz, 200-mVp-p square wave


• Confirm that the value for the waveform amplitude is between 400 and 560 (mVp-p) GUITAR/AMP Jack.

fig.test-30_50

• Confirm that the LINE/PHONES waveform amplitude is between 290 and 410 (mVp-p).

(3) INPUT-to-OUTPUT Noise Check

• Disconnect cable connected to INPUT and AUX IN.

• Listen to the noise and confirm the following.

1. Noise level is -83.0 dBm IHF-A (JIS-A) or lower (both L and R).

2. No abnormal sounds are mixed with the output sound.

3. No abnormal sounds occur when the unit is subjected to shock.


11. EXP Pedal Adjustmentfig.test-31_70

fig.test-32_70

• Raise the unit’s expression pedal completely, release the pedal, and press the [WRITE] switch.

19

ME-50

Note: Release the pedal when the pedal is fully raised, then press the [WRITE] switch.

If an error occurs, the green LED in the upper portion of the seven-segment LED display flashes.fig.test-33_70

• Press the unit’s expression pedal completely forward, release the pedal, and press the [WRITE] switch.

Note: Release the pedal when the pedal is pressed down completely, then press the [WRITE] switch.

If an error occurs, the green LED in the upper portion of the seven-segment LED display flashes.fig.test-34_70

• Press the [ ] or [ ] switch to select “5,” then press the [WRITE] switch.

• If no problem exists, the procedure automatically proceeds to Factory Reset.

Factory Reset“F” appears in the seven-segment LED.

• Press the [WRITE] switch. The BANK LED flashes.

• Press the [WRITE] switch. The seven-segment LED and BANK LED flash, and the factory data is loaded.

The dot in the seven-segment portion lights, and Factory Reset is completed when the unit switches to Play mode.

Never turn off the power while factory data is being loaded.

When the above is completed, the unit quits Test mode.

21

Feb.2003 ME-50

BLOCK DIAGRAM

fig.block

BUFFERQ1

Pre EmphLevel CTL

IC2 CODEC

(AD/DA)

IC3

DE EmphLevel CTL

IC1

BUFFER

IC18

INPUTOUTPUT R(MONO)

OUTPUT L

FILTER

IC5

MUTEQ2,3

BUFFER(NON INV)

IC6PHONES/LINE

DSPIC8

DRAMIC12

CPU

IC11

RESET

LED 2-4

LED 6-97 SEGLED

LED DRIVERIC16

LED 10-21LED DRIVER

IC17

MUTE CONTROLQ6

EEPROM IC

VR 18-21

VR 14-17

VR 10-13VR 6-9

VR 2-5

ANALOGMULTIPLEXER

IC4

ANALOGMULTIPLEXER

IC10

ANALOGMULTIPLEXER

IC7

EXP PEDAL

RIPPLEFILTER

Q9DC-DC

CONVERTERIC14

+3.3V

FOR ANALOG

+9.0V

AUX IN

CRYSTALOSCILLATOR

X2

SW1-4,6-9

CTL1,2

DC IN

VOLTAGEREGULATOR

IC19

FOR IC2, IC3

BATTERYCN3

MUTEQ4,5

SW5

JK 7

JK 1

JK 5

JK 6

JK 2

JK 3

JK 4

CRYSTALOSCILLATOR

X1

23

Feb.2003 ME-50

CIRCUIT BOARD

comp.eps

View from components side

25

Feb.2003 ME-50

CIRCUIT BOARD

foil.eps

View from foil side

27

Feb.2003 ME-50

CIRCUIT DIAGRAM

fig.main-cr

GUITAR INPUT

TO BATTERY

OUTPUT R

AUX IN

CTL 1,2

DC IN

OUTPUT L(MONO)

PHONES/LINE

7seg LED

144pin QFP

64pin QFP

DRAM

EXP PEDAL

RESET IC (Open Corector)

EXP BOARD

MAIN BOARD

(1Lot)HD6433687 (2Lot-)

LED4LED3LED2

DPGFEDCBA

LED6LED7LED8LED9

LED10LED11LED12LED13LED14LED15LED16LED17LED18LED19LED20LED21

LED

10

LED

11

LED

12

LED

13

LED

14

LED

15

LED

16

LED

17

LED

18

LED

19

LED

20

LED

21

LED

6

LED

7

LED

8

LED

9

A B C D E F G DP

A

+

+

A A

+

+

D

D

+D 3. 3

A

A

+ +

A

A

A

A

+D 3. 3

D

D

+D 3. 3

+D 3. 3

+D 3. 3

D

D

D

+D 3. 3

D

D

+D 3. 3

D

D

AA

D

+

A

D

A

D

D

D

+

D

A

D

D

+D 3. 3

+D 3. 3+D 3. 3

+ D3.3

A

A

D

D

D

D

+D 3. 3

D

D+D 3. 3+D 3. 3+D 3. 3

A

A

+

A

D

+D 3. 3+D 3. 3 +D 3. 3 +D 3. 3 +D 3. 3

+D 3. 3 +D 3. 3+D 3. 3+D 3. 3 +D 3. 3 +D 3. 3 +D 3. 3+D 3. 3+D 3. 3+D 3. 3 +D 3. 3+D 3. 3

+D 3. 3

D

D

+D 3. 3

+D 3. 3

D

D

+D 3. 3

D

+D 3. 3

+D 3. 3

+D 3. 3

D

+D 3. 3

D

+D 3. 3

D D

+D 3. 3

A

A

A

A

+

A

A

A

A

A

A

A A

D

D

D

D

A

AVCC

AVCC

AVCC

AVCC

AVCC

AVCC

D

+D 3. 3

+D 3. 3

D

D

D

D

AVCC

D

AVCC

DD

AVCC

D

D

+D 3. 3

+D 3. 3

+D 3. 3

+D 3. 3

+D 3. 3

+

+

+

D

+

++

+

+

+

A

D

A A

D

D

+ D3.3

+ D3.3

+ D3.3

+ D3.3A

D

A

D

A

D

A

D

A

A

A

+

A

D

D

+D 3. 3

+D 3. 3+D 3. 3

+

A

R8 27k

R210k

C10.0022

C5100/16

C6N.I.U.

R110k

+

-

IC1AM5218AFP

2

31

R25 27k

R2110k

C140.0022

+

-

IC1BM5218AFP

6

57

R1147k

C1210/16

R3310

C3110/16

R2410k(F)

R415k

C2210/16

C290.1

C32

N.I.U.

R710k

C2010/16

C910/16

C28100/16

C1910/16

C70.0022

+

-

IC2BNJM2100M

6

57

R610k

R9 1k

Q22SC4213A

1

23

Q42SC4213A

1

23

Q52SC4213A

1

23

RA9CRN34103J

1 82 73 64 5

RA7CRN34103J

1 82 73 64 5

C95

0.001

X2 SG-8002 (67.7376MHz)

OE1

GND2

OUT3

VDD4

R83

47

SW3SKQKAB1 2

SW4SKQKAB1 2

C10

50.

1

C10

60.

1

X1

49US SMD1 10MHz

C101 12pC100 12p

C74 0.1

C87 0.1

C1610/16

VR8RD901-40-125F-00D

1

2

3

VR10RD901-40-125F-00D

1

2

3

VR16RD901-40-125F-0DD(11detents)

1

2

3

RA2

CRN34101J

1 82 73 64 5

C71

0.1

JK1

HTJ-064-12I

1

24

VR6RD901-40-125F-00D

1

2

3

VR11RD901-40-125F-00D

1

2

3

VR13RD901-40-125F-00D

1

2

3

RA4

CRN34101J

1 82 73 64 5

C98

0.1

C91

0.1

C59

0.1

C17N.I.U.

VR14RD901-40-125F-00D

1

2

3

VR20RD901-40-125F-00D

1

2

3

C62

0.1

C70

0.1

R121M

C97

0.1

C4

0.47S


1

2

3

VR18RD901-40-125F-00D

1

2

3

C90

0.1


1

2

3

R1610k

VR7RD901-40-125F-00D

1

2

3

RA3

CRN34101J

1 82 73 64 5

VR12RD901-40-125F-00D

1

2

3

C93

0.1

IC10

TC74HC4052AF

3Y4

2Y2

1Y5

0Y1

3X11

2X15

1X14

0X12

YCOM3

XCOM13

INH6

B9

A10

VEE7

VCC16

GND8

IC7

TC74HC4052AF

3Y4

2Y2

1Y5

0Y1

3X11

2X15

1X14

0X12

YCOM3

XCOM13

INH6

B9

A10

VEE7

VCC16

GND8

C61

0.1

C69

0.1

Q12SK880GR

3

12

RA6

CRN34101J

1 82 73 64 5

C96

0.1

VR15RD901-40-125F-00D

1

2

3

VR21RD901-40-125F-00D

1

2

3

C99

0.1

VR19RD901-40-125F-00D

1

2

3

C92

0.1

R2210k

C60

0.1

C68

0.1

JK5

HSJ0857-01-1210

1

23

C42 10/16

C49 10/16

R91 47

RA8

CRN34473J

18

27

36

45

R97

10k

IC15

CAT24WC32J

A01

A12

A23

VSS4SDA

5

SCL6

WP7

VCC8

R96

10k C121

0.1

R100100

C45

0.1

C47

0.1

C46

0.1

VR3RD901-40-125F-00D

1

2

3

RA1

CRN34101J

1 82 73 64 5

VR4RD901-40-125F-00D

1

2

3

VR2RD901-40-125F-06D(6detents)

1

2

3

D1

1SS352

12

R63

1M

JK6

HTJ-064-12D

1

23

+

- IC6B

NJM4556

6

57

+

- IC6A

NJM4556

2

31

R38 10k

R50 10k

C35 10p

C51 10p

R564.7k

R584.7k C64

0.1

C650.1

CN2A2001WR2-3P

112233

CN1WIRING 3P

11 22 33


1

2

3

C48

0.1

C18

0.1

R17

4.7k

R44 4.7k

R59 4.7k

IC8

TC223C080AF-101

1

2345

6

78910

1

1

121314

15

1617

1

8

192021

22

232425

2

6

2728

29

30

31

32333435

36

37

383940414243

44

454647484950

5

1

5253

54

55

565758

5

9

60616263

64

65666768697071

72

7

3

7475

76

777879

80

81828384

85

86878889

9

0

9192

9

3

94959697

98

99100

1

01

102103104105106107

108

1

09

110111112113114115

116

117

118119

1

20

121122123

124

125126127

1

28

129130

131

132133

134135

136

137138

139

1

40

141

142143

144

C76 100/16

SW2SKQKAB1 2

C8810/16

SW1SKQKAB1 2

SW8SKQKAH1 2

RA10CRN34473J

18

27

36

45

SW7SKQKAH1 2

SW6SKQKAB1 2

R94

470

LED4

L-34GDSL

12

R93

680

LED3

L-34HDSL

12

R92

680

LED2

L-34HDSL

12

IC16

BU2090F

Q04

Q15

Q26

Q37

Q48

Q59

Q1014

Q610

Q711

Q812

CK3

Q913

Q1115 DATA

2

VDD16

VSS1

C113100/16

CN353015-0210

11

22

Q9 2SC4116GR

1

23

C111100/16

R852.2k

C1120.1

C1100.1

LED6

L-34HDSL

12

R110

680

LED7

L-34HDSL

12

R111

680

LED8

L-34GDSL

12

R113

680

R112

470

LED9

L-34HDSL

12

R119

680

R116

680

LED21

L-34HDSL

12

LED12

L-34HDSL

12

R117

680

LED19

L-34HDSL

12

R114

680

LED13

L-34HDSL

12

R124

680

LED14

L-34HDSL

12

LED15

L-34HDSL

12

LED11

L-34HDSL

12

R120

680

R121

680

R125

680

LED17

L-34HDSL

12

R115

680

R123

680

LED16

L-34HDSL

12

LED20

L-34HDSL

12

R122

330

LED10

L-34HDSL

12

LED18

L-312LRD

12

R118

680

LED5A-601H

A7

B6

C3

D2

E1

F9

G8

DP

4

COM15

COM210

R102

270

R103

270

R104

270

R105

270

R106

270

R107

270

R108

270

R109

270

C107100/16

C85

100/16

SW5B

SK22F02

222123

SW5A

SK22F02

121113

R7915k(F)

R826.8k(F)

C10210/16

+

- IC6C

NJM4556

84

C117100/16

C1200.1

C1180.1

L2N.I.U.

R87 47kR88 47k

D31SS352

12

+

- IC1C

M5218AFP

84

R43N.I.U.

C39

100/16

C54

100/16

R45100k

R60100k

R39

68(1/2W)

R52

68(1/2W)

R26 1k

R32

4.7k

JK3HTJ-064-12I

1

24

Q32SC4213A

1

23

+

- IC5C

M5218AFP

84

C210/16

R10 1k

JK2HTJ-064-12I

1

24

C24

10/16

R27 1k

R15100k

R31100k

C11

10/16

IC17

BU2090F

Q04

Q15

Q26

Q37

Q48

Q59

Q1014

Q610

Q711

Q812

CK3

Q913

Q1115 DATA

2

VDD16

VSS1

RA11CRN34473J

18

27

36

45

JK4HTJ-064-12D

1

23

R1310k

R47100k

R48100k

Q62SA1586GR

1

32

R6210k

R61

100

R5 10k

CN4

N.I.U.

11

22

33

44

55

66

77

R101 1.2k

DA1N.I.U.

21

3

R80miniSMDC075

D51SS352

12

R8612k

R20100

R77 47k

C810p

R18 150k(F)

C15 N.I.U.

R3 47k

C3 10p

R23 47k

C21 10p

+

-IC9B

N.I.U.

6

57 +

-IC9A

N.I.U.

2

31

+

- IC9CN.I.U.

84

C127N.I.U.

C86N.I.U.

R72N.I.U.

C72 N.I.U.

R65 N.I.U.

R68 N.I.U.

R71N.I.U.

R73N.I.U.

R74N.I.U.

R69N.I.U.

C75 N.I.U.

R67 N.I.U.

R75N.I.U.

R76N.I.U.

R66

N.I.U.C73N.I.U.

Q8N.I.U.

1

23

LED1

N.I.U.

12

R64N.I.U.

Q7N.I.U.

12

D2 N.I.U.1 2

C1160.01

C119100/16

L3SLF7032T-100M(10uH)

R95 33k

R99 33k

IC14 LT1616

SHDN4

VIN5

GN

D2

BOOST1

SW6

FB

3

R78 47k

IC4

TC74HC4052AF

3Y4

2Y2

1Y5

0Y1

3X11

2X15

1X14

0X12

YCOM3

XCOM13

INH6

B9

A10

VEE7

VCC16

GND8

R81 47k

JK7HEC2392-01-150

2

13

45

IC12

LC32V4265T-25-TLM

VCC1

I/O12I/O23I/O34I/O45

VCC6

I/O57I/O68I/O79I/O810

NC13

NC14

WE15

RAS16

NC17

A018 A119 A220 A321

VCC22

VSS23

A424 A525 A626 A727 A828

OE29

UCAS30

LCAS31

NC32

I/O935I/O1036I/O1137I/O1238

VSS39

I/O1340I/O1441I/O1542I/O1643

VSS44

+

-

IC18AM5218AFP

2

31

+

-

IC18BM5218AFP

6

57

R1275.6k

R1315.6k

R126 10k

R12810k

R13210k

R129100k

R133100k

R130 10k

C129 10p

C128 10p

R57N.I.U.

R42 10k

R53 10k

R40100k

C56

0.22/50

C67N.I.U.

R3610k

C52 10p

+

- IC5A

M5218AFP

2

31

R51100k R54

100k

R4910k

C370.0018R37

100k

R35 10k

C530.0018

+

- IC5B

M5218AFP

6

57

R41100k

C36 10p

R55100k

C41

0.22/50

R46 10k

C44150p

R13410k

R135100k

R13610k R137

100k

+

-

IC18CM5218AFP

84

C10

10/16

C23

10/16

C126100/16

VR1ARK11K1140 (10KSB) 11

1213

4

L1QT0460

1

2

4

3D4SS14

1 2

D6 1SS35212

D7

SS14

12

IC13M51957BFP

RS

T6

DLY5

VCC7

GN

D4

NC1

NC3

IN2

NC8

R13847k

C115N.I.U.

C133N.I.U.

C134N.I.U.

C136N.I.U.

C135N.I.U.

C137N.I.U.

C138N.I.U.

DA21SS302

2 1

3

DA31SS302

2 1

3

L4

N.I.U.

L5

N.I.U.

C131N.I.U.

R1424.7k

R1404.7k

R13947k

R70

10

+

-

IC2ANJM2100M

2

31

R8912k

C114

0.1

R14147k

R2910k

C260.1

+

-

IC2CNJM2100M

84

C2510/16

R9810k

C82

0.1

C124

0.1

C77

0.1

C380.1

C630.1

C79

0.1

C940.1

C300.1

C125100/16

C78

0.1

C80

0.1

C83

0.1

C1301.0u

C122

0.1

C10

810

0/16

C1030.1

C890.1

C84

0.1

C10

40.

1

C1320.1

C81

0.1

C10

90.

1

C123100/16

C66

47/16

R9010k

C331/50

C50N.I.U.

C58150p

R84

47k

C340.1

C147 100/16

C150

100/16

C151

100/16

R143100k

R144100k

R2810k

IC19S-81233SGY

IN2

OUT3

GN

D1

C1480.1

C1490.1

C152100/16

C146N.I.U.

C139N.I.U.

C140N.I.U.

C141N.I.U.

C142N.I.U.

C143N.I.U.

C144N.I.U.

C145N.I.U.

R14647k

IC11

HD64F3687H

PB2/AN260 PB3/AN359

PB5/AN564

PB4/AN463

P1225

P11/PWM24

P10/TMOW23

P2347

P14/IRQ051

PB7/AN72

PB6/AN61

P3516

P71/RXD_249 P72/TXD_250

PB1/AN161

PB0/AN062

AV

CC

3

P2431

P75/TMCIV29

P76/TMOV30

P17/IRQ3/TRGV54

P16/IRQ253

P15/IRQ1/TMIB152

NMI35

P63/FTIOD032

P62/FTIOC033

P61/FTIOB034

P60/FTIOA036

P66/FTIOC139 P67/FTIOD140

P64/FTIOA137 P65/FTIOB138

P74/TMRIV28

TEST8

VC

L6

P20/SCK344 P21/RXD45 P22/TXD46

X15

OSC210

RES7

OSC111

X24

P3256

P70/SCK3_248

P8541

P3617

P8743

P3718

P3415

P3355

P3058 P3157

VC

C12

VS

S9

P8642

P52/WKP219P53/WKP320

P54/WKP421P55/WKP5/ADTRG22

P56/SDA26P57/SCL27

P51/WKP114

P50/WKP013

R14547k

IC20N.I.U.

IN2

OUT3

GN

D1

C153N.I.U.

C154N.I.U.

IC3 AK4552VT

LIN2

SDTO8

RIN1

VD5 MCLK

11BCLK12

PDN13

DEM17

VCOM14

LRCK10

VSS3

SDTI9

DEM06

VA4

ROUT16

LOUT15

SW9SKQKAH1 2

RESET

BCK

MCK

AD

DA

AD

BCKMCK

DA

LRCK

LRCK

RESET

me-50 service notes english - el34 world

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