pulsoximeter

Caution: Federal law (U.S.) restricts this device to sale by or on the order of a physician.To contact Mallinckrodt’s representative: In the United States, call 1.800.635.5267 or 314.654.2000; outside of the UnitedStates, call your local Mallinckrodt representative.

0123

1999 Mallinckrodt Inc. All rights reserved. 033925E-0599

SERVICE MANUALNPB-190 Pulse Oximeter

Mallinckrodt, Inc.675 McDonnell BoulevardP.O. Box 5840St. Louis, MO 63134Tel 314.654.2000Toll Free 1.800.635.5267

Nellcor Puritan Bennett4280 Hacienda DrivePleasanton, CA 94588 USA

MallinckrodtEurope BVHambakenwetering 15231 DD’s-HertogenboschThe NetherlandsTel +31.73.6485200

Nellcor Puritan Bennett is a wholly owned subsidiary of Mallinckrodt Inc. Nellcor and Nellcor Puritan Bennett are trademarks ofMallinckrodt Inc.

To obtain information about a warranty, if any, for this product, contact Mallinckrodt Technical Services or your local Mallinckrodtrepresentative.

Purchase of this instrument confers no express or implied license under any Mallinckrodt patent to use the instrument with any sensorthat is not manufactured or licensed by Mallinckrodt.

Durasensor, and Oxisensor II, are trademarks of Mallinckrodt Inc.

Covered by one or more of the following U.S. Patents and foreign equivalents: 4,621,643; 4,653,498; 4,700,708; 4,770,179; 4,869,254;Re.35.122; 4,928,692; 4,934,372; 5,078,136; and 5,368.224.

iii

TABLE OF CONTENTS

List of FiguresList of Tables

Table Of Contents ....................................................................................... iiiList Of Figures......................................................................................... vList Of Tables.......................................................................................... vi

Section 1: Introduction ............................................................................... 1-11.1 Manual Overview.......................................................................... 1-11.2 NPB-190 Pulse Oximeter Description.......................................... 1-11.3 Power-On Self Test...................................................................... 1-21.4 Related Documents...................................................................... 1-3

Section 2: Routine Maintenance................................................................ 2-12.1 Cleaning ....................................................................................... 2-12.2 Periodic Safety and Functional Checks ....................................... 2-12.3 Battery.......................................................................................... 2-1

Section 3: Performance Verification ......................................................... 3-13.1 Introduction .................................................................................. 3-13.2 Equipment Needed ...................................................................... 3-13.3 Performance Tests....................................................................... 3-13.4 Safety Tests ................................................................................. 3-9

Section 4: Audible Alarm Settings & Service Menu................................. 4-14.1 Introduction .................................................................................. 4-14.2 Audible Alarm Settings................................................................. 4-14.3 Service Menu ............................................................................... 4-2

Section 5: Troubleshooting ....................................................................... 5-15.1 Introduction .................................................................................. 5-15.2 How To Use This Section............................................................. 5-15.3 Who Should Perform Repairs ...................................................... 5-15.4 Replacement Level Supported..................................................... 5-15.5 Obtaining Replacement Parts ...................................................... 5-15.6 Troubleshooting Guide................................................................. 5-25.7 Error Codes.................................................................................. 5-7

Section 6: Disassembly Guide................................................................... 6-16.1 Introduction .................................................................................. 6-16.2 Prior to Disassembly .................................................................... 6-16.3 Fuse Replacement ....................................................................... 6-26.4 Monitor Disassembly.................................................................... 6-36.5 Monitor Reassembly .................................................................... 6-46.6 Battery Replacement.................................................................... 6-56.7 Power Entry Module (PEM) Removal/Installation ........................ 6-66.8 Power Supply Removal/Installation.............................................. 6-76.9 Display PCB Removal/Installation................................................ 6-96.10 UIF PCB Removal/Installation...................................................... 6-106.11 Alarm Speaker Removal/Installation............................................ 6-11

Section 7: Spare Parts ................................................................................ 7-17.1 Introduction .................................................................................. 7-1

Section 8: Packing For Shipment .............................................................. 8-18.1 General Instructions ..................................................................... 8-1

Table of Contents

iv

8.2 Repacking in Original Carton ....................................................... 8-18.3 Repacking in a Different Carton................................................... 8-3

Section 9: Specifications............................................................................ 9-19.1 General ........................................................................................ 9-19.2 Electrical....................................................................................... 9-19.3 Physical Characteristics ............................................................... 9-29.4 Environmental .............................................................................. 9-29.5 Alarms .......................................................................................... 9-29.6 Factory Default Settings............................................................... 9-29.7 Performance ................................................................................ 9-3

Appendix (Serial Port Interface Protocol)................................................. A-1A1 Introduction .................................................................................. A-1A2 Enabling the Serial Port................................................................ A-1A3 Connecting to the Serial Port ....................................................... A-1A4 Real-Time Printout ....................................................................... A-2A5 Nurse Call .................................................................................... A-5

Technical Supplement ................................................................................ S-1S1 Introduction .................................................................................. S-1S2 Oximetry Overview....................................................................... S-1S3 Circuit Analysis............................................................................. S-3S4 Functional Overview..................................................................... S-3S5 AC Input ....................................................................................... S-3S6 Power Supply PCB Theory of Operation...................................... S-4S7 Battery.......................................................................................... S-5S8 User Interface PCB (UIF)............................................................. S-5S9 Front Panel Display PCB and Controls ........................................ S-8S10 Schematic Diagrams.................................................................... S-9

Table of Contents

v

LIST OF FIGURES

Figure 1-1: NPB-190 Front Panel.................................................................. 1-2Figure 1-2: NPB-190 Rear Panel .................................................................. 1-2Figure 3-1: NPB-190 Controls....................................................................... 3-2Figure 3-2: Self-Test Display......................................................................... 3-3Figure 3-3: Adjusting High %SpO2 Alarm Limit ............................................ 3-3Figure 3-4: Adjusting Low %SpO2 Alarm Limit ............................................. 3-4Figure 3-5: Adjusting High Heart Rate Alarm Limit ....................................... 3-4Figure 3-6: Adjusting Low Heart Rate Alarm Limit ........................................ 3-4Figure 3-7: Alarm Silence Duration ............................................................... 3-6Figure 3-8: Alarm Volume Display ................................................................ 3-7Figure 4-1: NPB-190 Controls....................................................................... 4-1Figure 6-1: Fuse Removal............................................................................. 6-2Figure 6-2: NPB-190 Corner Screws ............................................................ 6-3Figure 6-3: Separating Case Halves ............................................................. 6-4Figure 6-4: Battery Removal ......................................................................... 6-5Figure 6-5: Power Entry Module.................................................................... 6-6Figure 6-6: Power Supply Leads Connections .............................................. 6-7Figure 6-7: Power Supply.............................................................................. 6-8Figure 6-8: Display PCB................................................................................ 6-9Figure 6-9: UIF PCB...................................................................................... 6-10Figure 6-10: Alarm Speaker .......................................................................... 6-12Figure 7-1: NPB-190 Exploded View............................................................. 7-2Figure 8-1: Repacking the NPB-190 ............................................................. 8-2Figure A-1: Serial Port Pin Layout................................................................. A-2Figure A-2: Real-Time Printout ..................................................................... A-2Figure S-1: Oxyhemoglobin Dissociation Curve ........................................... S-2Figure S-2: NPB-190 Functional Block Diagram........................................... S-3Figure S-3 Front End Red/IR Schematic Diagram....................................... S-11Figure S-4 Front End LED Drive Schematic Diagram.................................. S-13Figure S-5 Front End Output Schematic Diagram ....................................... S-15Figure S-6 Front End Power Supply Schematic Diagram ............................ S-17Figure S-7 Isolation Barrier EIA-232 Port Schematic Diagram .................... S-19Figure S-8 CPU Core Schematic Diagram .................................................. S-21Figure S-9 PIC and Speaker Schematic Diagram ....................................... S-23Figure S-10 Indicator Drive Schematic Diagram.......................................... S-25Figure S-11 Core Power Supply Schematic Diagram .................................. S-27Figure S-12 Parts Locator Diagram for UIF PCB......................................... S-29Figure S-13 Display PCB Schematic Diagram............................................. S-31Figure S-14 Parts Locator Diagram for Display PCB................................... S-33Figure S-15 Power Supply Schematic Diagram........................................... S-35Figure S-16 Parts Locator Diagram for Power Supply PCB......................... S-37

Table of Contents

vi

LIST OF TABLESTable 3-1: Dynamic Operating Range.......................................................... 3-8Table 3-2: Earth Leakage Current Limits ..................................................... 3-10Table 3-3: Enclosure Leakage Current Limits.............................................. 3-11Table 3-4: Patient Leakage Current Limits .................................................. 3-12Table 3-5: Patient Leakage Current Test Configurations - Mains

Voltage on the Applied Part ........................................................ 3-12Table 4-1: Factory Default Settings.............................................................. 4-3Table 5-1: Problem Categories .................................................................... 5-2Table 5-2: Power Problems.......................................................................... 5-3Table 5-3: Button Problems ......................................................................... 5-4Table 5-4: Display/Alarms Problems............................................................ 5-4Table 5-5: Operational Performance Problems ........................................... 5-5Table 5-6: Serial Port Problems................................................................... 5-6Table 5-7: Error Codes................................................................................. 5-7Table A-1: Serial Port Pin Outs .................................................................... A-1Table A-2: Status Codes .............................................................................. A-4

1-1

SECTION 1: INTRODUCTION1.1 Manual Overview1.2 NPB-190 Pulse Oximeter Description1.3 Power-On Self Test1.4 Related Documents

1.1 MANUAL OVERVIEW

This manual contains information for servicing the Nellcor model NPB-190Pulse Oximeter. Only qualified service personnel should service this product.Before servicing the NPB-190, read the operator’s manual carefully for athorough understanding of operation.

Warning: Explosion hazard. Do not use the NPB-190 pulse oximeter in thepresence of flammable anesthetics.

1.2 NPB-190 PULSE OXIMETER DESCRIPTION

The Nellcor NPB-190 portable pulse oximeter is intended for continuous,noninvasive measurement of functional oxygen saturation of arterial hemoglobin(SpO2), and pulse rate (measured by SpO2 sensor).

The monitor is intended for use on adult, pediatric, and neonatal patients in allhospital-type facilities and in the home environment. It may be used during intra-hospital transport when powered by its internal battery.

Digital displays are provided for oxygen saturation and pulse rate, and a 10-segment LED bar indicates pulse amplitude. High and low alarm limits forsaturation and pulse rate can be adjusted by the operator. The NPB-190 canoperate on AC or a rechargeable internal battery power. The controls andindicators for the NPB-190 are illustrated in Figures 1-1 and 1-2.

Section 1: Introduction

1-2

NPB190

1 2 3 4 5 6 7 8 9

101112131415

Figure 1-1: NPB-190 Front Panel

1. SpO2 Sensor Port 9. Alarm Silence Button2. Power On/Standby Button 10. Adjust Up Button3. AC/Battery Charging Indicator 11. Adjust Down Button4. Low Battery Indicator 12. Pulse Search Indicator5. %SpO2 Display 13. Upper Alarm Limit Button6. Pulse Amplitude Indicator 14. Lower Alarm Limit Button7. Pulse Beats per Minute Display 15. Speaker8. Alarm Silence Indicator

Figure 1-2: NPB-190 Rear Panel

1. Equipotential Terminal 4. Fuse Drawer2. AC Connector 5. Voltage Selector Switch3. Serial Port

1.3 POWER-ON SELF TEST

When the NPB-190 is turned on it will perform a POST (Power On Self Test).During POST the following sequence should occur:

• All indicator lights illuminate• All segments of the numeric digits light• All segments of the Pulse Amplitude Display light

U.S. PATENTS: 4,621,643; 4,653,498; 4,700,708; 4,770,179; 4,869,254; Re. 35,122; 4,928,692; 4,934,372; 5,078,136 0123

IPX1R

NRTL/C

NPB-190

T 0.50A 250V

2X

NELLCOR PURITAN BENNETT EUROPE BV,'s-HERTOGENBOSCH, THE NETHERLANDS

036400-1098

NELLCOR PURITAN BENNETT, INC.PLEASANTON, CA 94588, U.S.A.

MADE IN IRELAND

SN

100-120 V~ 200-240 V~ 50/60Hz

20 VA

TM

CISPR 11Group 1Class B

1 2 3

5 4

Section 1: Introduction

1-3

Upon completion of the POST display test, the software versions will bedisplayed for approximately 2 seconds. Two versions are displayed:

• The first version is indicated by the numeral “1” in the leftmost segment ofthe %SpO2 display. The series of digits and decimal points displayed to theright of the “1” represent the main processor software version.

• The second version is indicated by the numeral “2” in the leftmost segmentof the %SpO2 display. The number(s) appearing to the right of the “2”represent the subprocessor software version.

The software version numbers are often needed when calling Mallinckrodt’sTechnical Services Department or your local Mallinckrodt representative fortechnical assistance. Record the numbers and have them available prior torequesting technical assistance.

Upon successful completion of POST, the NPB-190 sounds a 1-second toneindicating that the monitor has passed the test.

If the start-up sequence is not completed as described above do not use themonitor.

1.4 RELATED DOCUMENTS

To perform test and troubleshooting procedures and to understand the principlesof operation and circuit analysis sections of this manual, you must know how tooperate the monitor. Refer to the NPB-190 operator’s manual. To understand thevarious Nellcor sensors that work with the monitor, refer to the individual sensordirections for use.

2-1

SECTION 2: ROUTINE MAINTENANCE

2.1 Cleaning2.2 Periodic Safety and Functional Checks2.3 Battery

2.1 CLEANING

Caution: Do not immerse the NPB-190 or its accessories in liquid or cleanwith caustic or abrasive cleaners. Do not spray or pour any liquid on themonitor or its accessories.

To clean the NPB-190, dampen a cloth with a commercial, nonabrasive cleanerand wipe the exterior surfaces lightly. Do not allow any liquids to come incontact with the power connector, fuse holder, or switches. Do not allow anyliquids to penetrate connectors or openings in the instrument cover. Wipe sensorcables with a damp cloth. For sensors, follow the individual directions for use.

2.2 PERIODIC SAFETY AND FUNCTIONAL CHECKS

The following checks should be performed at least every 2 years by a qualifiedservice technician:

1. Inspect the exterior of the NPB-190 for damage.

2. Inspect safety labels for legibility. If the labels are not legible, contactMallinckrodt’s Technical Services Department or your local Mallinckrodtrepresentative.

3. Verify that the unit performs properly as described in paragraph 3.3.

4. Perform the electrical safety tests detailed in paragraph 3.4. If the unit failsthese electrical safety tests, do not attempt to repair.

5. Inspect the fuses in the Power Entry Module for proper value and rating.The fuses are slow blow, 0.5 amp, and 250 volt.

2.3 BATTERY

Mallinckrodt recommends replacing the instrument battery every 2 years. Whenthe NPB-190 is going to be stored for 3 months or more remove the battery. Toreplace or remove the battery, refer to Section 6, Disassembly Guide.

If the NPB-190 has been stored for more than 30 days, charge the battery asdescribed in paragraph 3.3.1. A fully discharged battery requires 14 hours toreceive a full charge. The battery is being charged anytime the instrument isplugged into AC.

3-1

SECTION 3: PERFORMANCE VERIFICATION

3.1 Introduction3.2 Equipment Needed3.3 Performance Tests3.4 Safety Tests

3.1 INTRODUCTION

This section discusses the tests used to verify performance following repairs orduring routine maintenance. All tests can be performed without removing theNPB-190 cover. All tests except the battery charge and battery performance testsmust be performed as the last operation before the monitor is returned to theuser.

If the NPB-190 fails to perform as specified in any test, repairs must be made tocorrect the problem before the monitor is returned to the user.

3.2 EQUIPMENT NEEDED

Equipment DescriptionDigital multimeter (DMM) Fluke Model 87 or equivalentDurasensor oxygen transducer DS-100A

Oxisensor II oxygen transducer D-25Pulse oximeter tester SRC-2Safety analyzer Must meet current AAMI specificationsSensor extension cable EC-4 or EC-8Serial interface cable EIA-232 cable (optional)Stopwatch Manual or electronic

3.3 PERFORMANCE TESTS

The battery charge procedure should be performed before monitor repairswhenever possible. It should also be performed before and after performing thebattery performance test (paragraph 3.3.2).

Note: This section is written using Mallinckrodt factory-set defaults. If yourinstitution has preconfigured custom defaults, those values will bedisplayed. Factory defaults can be reset using the configurationprocedure described in paragraph 4.3.3.

3.3.1 Battery Charge

Perform the following procedure to fully charge the battery.

1. Connect the monitor to an AC power source.

Section 3: Performance Verification

3-2

2. Verify that the monitor is off and that the AC Power/Battery Chargingindicator is lit.

3. Charge the battery for at least 14 hours.

3.3.2 Performance Tests

The power-up performance tests (3.3.2.1 and 3.3.2.2) verify the followingmonitor functions:

• Power-On Self-Test• Factory Power-On Defaults and Alarm Limit Ranges

NPB-190

On/Standby Alarm Silence

AdjustUp

AdjustDown

Lower AlarmLimit

Upper AlarmLimit

Figure 3-1: NPB-190 Controls

Note: Refer to Figure 3-1, NPB-190 Controls, when following the instructionslisted below.

3.3.2.1 Power-On Self-Test

1. Connect the monitor to an AC power source. Verify that the ACPower/Battery Charging indicator is lit.

2. Do not connect any input cables to the monitor.

3. Observe the monitor front panel. With the monitor off, press the PowerOn/Standby button. Verify that the monitor performs the followingsequence:


3-3

a. All indicators light for a few seconds as illustrated in Figure 3-2.

NPB190

LEDsilluminated

LEDilluminated

888 displayed

LEDilluminated

10 segmentsilluminated

Figure 3-2: Self-Test Display

b. The software version is displayed and the AC Power/Battery Chargingindicators remain on.

c. When a sensor is connected a zero is displayed in each window, a 1-second Power-On Self-Test (POST) beep sounds and the Pulse SearchLED is illuminated.

If no sensor is connected a 1 second POST beep sounds, 3 dashes aredisplayed in each window and the Pulse Search LED is off.

d. The NPB-190 begins normal operation if a sensor is connected.Without a sensor the monitor will be in the idle mode (3 dashes in eachwindow).

3.3.2.2 Factory Power-On Defaults and Alarm Limit Ranges

Note: When observing or changing default limits, a 3-second timeout is ineffect, that is, if no action is taken within 3 seconds, the monitorautomatically returns to the normal mode.

1. Turn the monitor on by pressing the Power On/Standby button. Wait forPOST to be completed. Press and release the Upper Alarm Limit button.Verify that the monitor emits a single beep and the %SpO2 display indicatesa high alarm limit of “100” for about 3 seconds. Verify that three dashes aredisplayed at the top of the pulse rate display window.

Note: The location of the three dashes indicates the type of alarm limit that isbeing adjusted. Three dashes in the top of the display window indicate ahigh alarm limit and three dashes in the bottom of the display windowindicate a low alarm limit.

Figure 3-3: Adjusting High %SpO2 Alarm Limit

Normal monitoring is resumed after 3 seconds.


3-4

2. Press the Upper Alarm Limit button. Press and hold the Adjust Downbutton. Verify that the %SpO2 display reduces to a minimum of “85”.

Note: A decimal point to the right of the value in either display indicates thatthe alarm limits are not power-on default values.

3. Press the Lower Alarm Limit button. Verify that the monitor emits a singlebeep and that the %SpO2 display indicates an alarm limit of “85” for 3seconds. Verify that three dashes are displayed at the bottom of the pulserate display window.

Figure 3-4: Adjusting Low %SpO2 Alarm Limit

4. Press the Lower Alarm Limit button. Press and hold the Adjust Downbutton and verify that the %SpO2 display reduces to a minimum of “20”.Press and hold the Adjust Up button and verify that the %SpO2 displaycannot be raised past the upper alarm limit setting of “85”.

5. Press the Upper Alarm Limit button two times rapidly (twice within 3seconds). Verify that the monitor emits two beeps, the pulse rate displayindicates an alarm limit of “170”, and that the %SpO2 display windowshows three dashes at the top for about 3 seconds.

Figure 3-5: Adjusting High Heart Rate Alarm Limit

6. Press the Upper Alarm Limit button two times rapidly. Press and hold theAdjust Down button. Verify that the pulse rate display reduces to aminimum of “40”.

7. Press the Lower Alarm Limit button two times rapidly. Verify that the pulserate display indicates an alarm limit of “40” and that the %SpO2 displaywindow shows three dashes at the bottom for 3 seconds.

Figure 3-6: Adjusting Low Heart Rate Alarm Limit

8. Press the Lower Alarm Limit button two times rapidly. Press and hold theAdjust Down button. Verify that the pulse rate display reduces to aminimum of “30”.

9. Press the Lower Alarm Limit button two times rapidly. Press and hold theAdjust Up button and verify that the pulse rate display cannot be adjustedabove “40”.


3-5

10. Press the Power On/Standby button to turn the unit off. Turn the unit backon.

11. Press and release the Upper Alarm Limit button. Verify that the %SpO2display indicates an alarm limit of “100”.

12. Press and release the Lower Alarm Limit button. Verify that the %SpO2display indicates an alarm limit of “85”.

13. Press the Upper Alarm Limit button two times rapidly. Verify that the pulserate display indicates an alarm limit of “170”.

14. Press the Lower Alarm Limit button two times rapidly. Verify that the pulserate display indicates an alarm limit of “40”.

15. Press the Power On/Standby button to turn the monitor off.

3.3.3 Hardware and Software Tests

Hardware and software testing include the following tests:

• Operation with a Pulse Oximeter Tester• General Operation

3.3.3.1 Operation with a Pulse Oximeter Tester

Operation with an SRC-2 pulse oximeter tester includes the following tests:

• Alarms and Alarm Silence• Alarm Volume Control• Pulse Tone Volume Control• Dynamic Operating Range• Nurse Call

3.3.3.1.1 Alarms and Alarm Silence

1. Connect the SRC-2 pulse oximeter tester to the sensor input cable andconnect the cable to the monitor. Set the SRC-2 as follows:

SWITCH POSITIONRATE 38LIGHT HIGHMODULATION OFFRCAL/MODE RCAL 63/LOCAL

2. Press the Power On/Standby button to turn the monitor on. After the normalpower-up sequence, verify that the pulse rate initially indicates zeroes.

Note: The pulse bar may occasionally indicate a step change as themonitor is in the pulse search mode.

3. Set the modulation switch on the SRC-2 to HIGH.

4. Verify the following monitor reactions:


3-6

a. The pulse blip bar begins to track the artificial pulse signal from theSRC-2.

b. The pulse tone is heard.

c. Zeroes are displayed in the %SpO2 and pulse rate displays.

d. After about 10 to 20 seconds, the monitor displays oxygen saturationand pulse rate as specified by the tester. Verify that the values arewithin the following tolerances:

Oxygen Saturation Range 79% to 83%Pulse Rate Range 37 to 39 bpm

e. The audible alarm sounds and both the %SpO2 and pulse rate displaysflash. This is an indication that both parameters have violated thedefault alarm limits.

5. Press and hold the Alarm Silence button on the front of the monitor for lessthan 3 seconds. Verify that the pulse rate display indicates “SEC” and the%SpO2 display indicates “60” while the Alarm Silence button is pressed.The alarm is silenced when the button is released.

Figure 3-7: Alarm Silence Duration

6. Release the Alarm Silence button. Verify the following:

a. The alarm remains silenced.

b. The Alarm Silence indicator lights.

c. The %SpO2 and pulse rate displays resume flashing.

d. The pulse tone is still audible.

e. The audible alarm returns after approximately 60 seconds.

7. While pressing the Alarm Silence button, press the Adjust Down buttonuntil the %SpO2 display indicates “30”. Press the Adjust Up button andverify that the displays indicate 60 SEC, 90 SEC, 120 SEC, and OFF.Release the button when the display indicates “OFF”. Press the AlarmSilence button again and verify that the Alarm Silence indicator flashes.

8. Wait approximately 3 minutes. Verify that the alarm does not return. After 3minutes ± 10 seconds, the alarm silence reminder beeps three times, andcontinues to do so at 3-minute intervals.


3-7

3.3.3.1.2 Alarm Volume Control

After completing the procedure in paragraph 3.3.3.1.1:

1. Press and hold the Alarm Silence button for more than 3 seconds. Verify thefollowing:

a. “OFF” is displayed for approximately 3 seconds.

b. After 3 seconds, a steady tone is heard at the default alarm volumesetting, the %SpO2 display indicates “VOL”, and the pulse rate displayindicates the default setting of 5.

Figure 3-8: Alarm Volume Display

2. Press the Adjust Down button until an alarm volume setting of 1 isdisplayed. Verify that the volume of the alarm has decreased but is stillaudible.

3. Press the Adjust Up button to increase the alarm volume setting to amaximum value of 10. Verify that the volume increases. Press the AdjustDown button until a comfortable audio level is attained.

4. Release the Alarm Silence button. The tone stops.

3.3.3.1.3 Pulse Tone Volume Control

1. When a valid pulse has been acquired, press the Adjust Up button andverify that the beeping pulse tone sound level increases.

2. Press the Adjust Down button and verify that the beeping pulse tonedecreases until it is no longer audible. Press the Adjust Up button to returnthe beep volume to a comfortable level.

3.3.3.1.4 Dynamic Operating Range

The following test sequence verifies proper monitor operation over a range ofinput signals:

1. Connect the SRC-2 to the NPB-190 and turn the NPB-190 on.

2. Place the SRC-2 in the RCAL 63/LOCAL mode.

3. Set the SRC-2 as indicated in Table 3-1. Verify that the NPB-190 readingsare within the indicated tolerances. Allow the monitor several seconds tostabilize the readings.

Note: A (*) indicates values that produce an alarm. Press the Alarm Silencebutton to silence the alarm.


3-8

Table 3-1: Dynamic Operating Range

SRC-2 Settings NPB-190 IndicationsRATE LIGHT MODULATION SpO2 Pulse Rate38 HIGH2 LOW 79 - 83* 37 - 39*112 HIGH1 HIGH 79 - 83* 110 - 114201 LOW LOW 79 - 83* 198 - 204*201 LOW HIGH 79 - 83* 198 - 204*

3.3.3.1.5 Nurse Call

Note: The Nurse Call tests must be performed with the instrument operatingon AC power.

1. Connect the negative lead of a voltmeter to pin 10 and positive to pin 11 ofthe serial port on the back of the instrument (Figure A-1 in appendix).Ensure that the audible alarm is not silenced or turned off.

2. Set the SRC-2 to create an alarm condition. Verify an output voltage at pins10 and 11 between +5 to +12 VDC.

3. Press the Alarm Silence button. With no active audible alarm, the outputvoltage at pins 10 and 11 must be between -5 to -12 VDC.

4. Turn the instrument off. Disconnect the voltmeter and the SRC-2.

3.3.3.1.6 Operation on Battery Power

1. Turn the instrument on using AC Power.

2. Disconnect the instrument from AC and verify that the AC Power Indicatorturns off.

3. Verify that the instrument continues monitoring normally and that the LowBattery Indicator is not lit.

Note: If the Low Batter Indicator is illuminated, perform the procedureoutlined in step 3.3.1.

4. Connect the instrument to AC and verify that the AC Power Indicator turnson and that the instrument is monitoring normally.

3.3.3.2 General Operation

The following tests are an overall performance check of the system:

• LED Excitation Test• Monitor Operation with a Live Subject

3.3.3.2.1 LED Excitation Test

This procedure uses normal system components to test circuit operation. ANellcor Oxisensor II� oxygen transducer, model D-25, is used to examine LEDintensity control. The red LED is used to verify intensity modulation caused bythe LED intensity control circuit.


3-9

1. Connect the monitor to an AC power source.

2. Connect an EC-4 or EC-8 sensor input cable to the monitor.

3. Connect a D-25 sensor to the sensor input cable.

4. Press the Power On/Standby button to turn the monitor on.

5. Leave the sensor open with the LEDs and photodetector visible.

6. After the monitor completes its normal power-up sequence, verify that thesensor LED is brightly lit.

7. Slowly move the sensor LED in proximity to the photodetector element ofthe sensor. Verify, as the LED approaches the photodetector, that the LEDintensity decreases.

8. Open the sensor and notice that the LED intensity increases.

9. Repeat step 7 and the intensity will again decrease. This variation is anindication that the microprocessor is in proper control of LED intensity.

10. Turn the NPB-190 off.

3.3.3.2.2 Monitor Operation with a Live Subject

Pulse oximetry involves connecting the monitor to a live subject for a qualitativetest.

1. Ensure that the monitor is connected to an AC power source.

2. Connect an EC-4 or EC-8 sensor input cable to the monitor.

3. Connect a Nellcor Durasensor� oxygen transducer, model DS-100A, to thesensor input cable.

4. Clip the DS-100A to an adult subject as recommended in the sensordirections for use.

5. Press the Power On/Standby button to turn the monitor on and verify thatthe monitor is operating.

6. The monitor should stabilize on the subject’s physiological signal in about15 to 30 seconds. Verify that the saturation and heart rates are reasonablefor the subject.

3.4 SAFETY TESTS

NPB-190 safety tests meet the standards of, and are performed in accordancewith, IEC 601-1 (EN 60601-1, Second Edition, 1988; Amendment 1, 1991-11,Amendment 2, 1995-03) and UL 2601-1 (August 18, 1994), for instrumentsclassified as Class 1 and TYPE BF and AAMI Standard ES1 (ANSI/AAMI ES11993).


3-10

• Ground Integrity• Electrical Leakage

3.4.1 Ground Integrity

This test checks the integrity of the power cord ground wire from the AC plug tothe instrument chassis ground. The current used for this test is < 6V RMS 50 or60 Hz and 25 A.

1. Connect the monitor AC mains plug to the analyzer as recommended by theanalyzer operating instructions.

2. Connect the analyzer resistance input lead to the equipotential terminal(grounding lug) on the rear panel of the instrument. Verify that the analyzerindicates 100 milliohms or less.

3.4.2 Electrical Leakage

The following tests verify the electrical leakage of the monitor:

• Earth Leakage Current• Enclosure Leakage Current• Patient Leakage Current• Patient Source Current (Mains on Applied Part)

Note: For the following tests, ensure that the AC switch on the rear of theinstrument is configured for the AC voltage being supplied.

3.4.2.1 Earth Leakage Current

This test is in compliance with IEC 601-1 (earth leakage current) and AAMIStandard ES1 (earth risk current). The applied voltage for AAMI ES1 is 120VAC 60 Hz, for IEC 601-1 the voltage is 264 VAC 50 to 60 Hz. Allmeasurements shall be made with the power switch in both the “On” and “Off”positions.

1. Connect the monitor AC plug to the electrical safety analyzer asrecommended by the analyzer operating instructions.

2. The equipotential terminal is not connected to ground.

Table 3-2: Earth Leakage Current Limits

ACPOLARITY

LINE CORD NEUTRALCORD

LEAKAGECURRENT

Normal Closed Closed 500 µAReversed Closed Closed 500 µANormal Open Closed 1000 µANormal Closed Open 1000 µA

3.4.2.2 Enclosure Leakage Current

This test is in compliance with IEC 601-1 (enclosure leakage current) and AAMIStandard ES1 (enclosure risk current). This test is for ungrounded enclosurecurrent, measured between enclosure parts and earth. The applied voltage for


3-11

AAMI/ANSI is120 VAC 60 Hz, and for IEC 601-1 the applied voltage is 264 VAC 50 to 60 Hz.

1. Connect the monitor AC plug to the electrical safety analyzer asrecommended by the analyzer operating instructions.

2. Place a 200 cm2 foil in contact with the instrument case making sure the foilis not in contact with any metal parts of the enclosure that may be grounded.Measure the leakage current between the foil and earth.

The analyzer leakage indication must not exceed values listed in the table below:

Table 3-3: Enclosure Leakage Current Limits

AC LINECORD

NEUTRALLINE CORD

POWER LINEGROUND CABLE

IEC 601-1 AAMI/ANSI ES1STANDARD

Closed Closed Closed 100 µA 100 µAClosed Closed Open 500 µA 300 µAClosed Open Closed 500 µA 300 µAOpen Closed Closed 500 µA 100 µAOpen Open Closed 500 µA 300 µAOpen Closed Open 500 µA 300 µA

3.4.2.3 Patient Applied Risk Current

This test is in compliance with AAMI Standard ES1 (patient applied riskcurrent), and IEC 601-1 (patient auxiliary current). The leakage current ismeasured between any individual patient connection and power (earth) ground.The applied voltage for AAMI/ANSI is 120 VAC 60 Hz, and for IEC 601-1 theapplied voltage is 264 VAC 50 to 60 Hz.

1. Configure the electrical safety analyzer as follows:

Function: Patient LeakageRange: µA

2. Connect the monitor AC plug to the electrical safety analyzer asrecommended by the analyzer operating instructions for Patient LeakageCurrent.

3. Connect the electrical safety analyzer patient leakage input lead to all pinsof the monitor's patient cable at the end of the cable.


5. All functional earth terminals are not connected to ground.

6. Measure the leakage current between the patient connector and earth.


3-12

Table 3-4: Patient Leakage Current Limits

AC LINEPOLARITY

NEUTRALLINE

POWER LINEGROUNDCABLE

IEC 601-1 AAMI/ANSIES1STANDARD

Normal Closed Closed 100 µA 10 µANormal Open Closed 500 µA 50 µANormal Closed Open 500 µA 50 µAReverse Closed Closed 100 µA 10 µAReverse Open Closed 500 µA 50 µAReverse Closed Open 500 µA 50 µA

3.4.2.4 Patient Isolation Risk Current - (Mains Voltage on the Applied Part)

This test is in compliance with AAMI Standard ES1 (patient isolation riskcurrent [sink current]), and IEC 601-1 (patient leakage current). Patient LeakageCurrent is the measured value in a patient connection if mains voltage isconnected to that patient connection. The applied voltage for AAMI/ANSI is 120VAC 60 Hz, and for IEC 601-1 the applied voltage is 264 VAC 50 to 60 Hz.

Warning: AC mains voltage will be present on the patient applied partterminals during this test. Exercise caution to avoid electrical shock hazard.

1. Configure the electrical safety analyzer as follows:

Function: Patient Leakage (Mains On Applied Part)Range: µA

2. Connect the monitor AC plug to the electrical safety analyzer asrecommended by the operating instructions for patient sink (leakage)current.

3. Connect the electrical safety analyzer patient leakage input lead to allconnectors in the patient cable at the patient end of the cable.


5. All functional earth terminals are not connected to ground.

6. The analyzer leakage current must not exceed the values shown in the tablebelow.

Table 3-5: Patient Leakage Current Test Configurations -Mains Voltage on the Applied Part

AC LINEPOLARITY

NEUTRALLINE

POWERLINEGROUNDCABLE

IEC 601-1 AAMI/ANSIES1STANDARD

Normal Closed Closed 5 mA 50 µAReverse Closed Closed 5 mA 50 µA

4-1

SECTION 4: AUDIBLE ALARM SETTINGS & SERVICE MENU

4.1 Introduction4.2 Audible Alarm Settings4.3 Service Menu

4.1 INTRODUCTION

This section discusses use of the service menu to reconfigure power-on defaultvalues, and how to control the behavior of the audible alarm.

4.2 AUDIBLE ALARM SETTINGS

The following paragraphs describe how to change the behavior of the audiblealarm. Operators can select the volume of the alarm and the duration of alarmsilence. Controls for the NPB-190 are shown in Figure 4-1.

NPB190

On/Standby Alarm silence

Adjustup

Adjustdown

Set lowerlimit

Set upperlimit

Figure 4-1: NPB-190 Controls

4.2.1 Alarm Silence State

Press the Alarm Silence button to silence the alarm. Press the button a secondtime to turn the alarm back on.

4.2.2 Alarm Silence Duration

1. Press and hold the Alarm Silence button for less than 3 seconds.

2. Before 3 seconds have passed the Adjust Up or Adjust Down button can beused to change the duration of the alarm silence. The alarm’s duration canbe 30, 60, 90, 120 seconds, or the alarm can be turned off.

4.2.3 Alarm Volume

1. Press and hold the Alarm Silence button for more than 3 seconds.

Section 4: Audible Alarm Settings & Service Menu

4-2

2. After 3 seconds, while still pressing the Alarm Silence button, the AdjustUp or Adjust Down button can be used to select alarm volumes from 1 to10. Select a level that is suitable for the monitor’s location.

4.3 SERVICE MENU

The menu items listed below should be accessed only by a qualified servicetechnician. Power-on default values can be changed for the behavior of theaudible alarm, alarm limits, and for the serial port.

4.3.1 Accessing Menu Items

1. Menu items can be accessed at any time by pressing the Upper and LowerAlarm Limit buttons simultaneously for at least 3 seconds. The servicemenu has been accessed when a 1 appears in the pulse rate display.

2. Pressing the Adjust Up or Adjust Down button selects the menu itemnumber. Menu numbers 5 and 6, have items within them that can be selectedby first pressing the Upper Alarm Limit button, and then pressing the AdjustUp or Adjust Down key.

Note: Service menu items greater than 2 cannot be accessed if a sensor isconnected to the monitor.

3. Once adjustments have been made within a menu item the, Upper AlarmLimit button can be used to initiate the current selection. Three tones willsound to indicate that the change has been accepted, and the monitor willreturn to normal monitoring.

4. The service menu can be exited without making changes by pressing theLower Alarm Limit button. If a period of 10 seconds passes with no buttonpresses, the instrument will exit the service menu, go to normal monitoring,and no changes will have been made.

4.3.2 Menu Item 1 (Save Current Values as Power-On Default)

1. If menu item 1 is selected, the current values for alarm limits, alarm volume,pulse beep volume, audible alarm silence duration, alarm silence behavior,and baud rate will be saved as the power-on default settings. Some valuesare not allowed to be saved as power on default values, they are; an AlarmSilence Duration of Off, and low %SpO2 alarm limits less than 80%. If aninvalid tone is heard instead of the triple beep the current settings were notchanged.

Note: Current values will not be stored in memory as defaults, if power isinterrupted before exiting this menu option.

Note: When the operator changes an alarm limit to a value other than a poweron default value, a decimal point will appear to the right of the parameterwhose alarm limit was changed.


4-3

4.3.3 Menu Item 2 (Return to Default Settings)

Menu item 2 resets the monitor to factory default settings as shown in table 4-1.

Table 4-1: Factory Default Settings

Parameter Default ValueSpO2 High 100%SpO2 Low 85%Pulse rate High 170 bpmPulse rate Low 40 bpmPulse beep volume Level 4Alarm Volume Level 5Alarm Silence Duration 60 secondsAlarm Silence Behavior 0 (Off with reminder)Baud Rate 9600

Note: Menu items greater than 2 cannot be accessed when a valid sensor isplugged into the unit.

Note: To reach menu item 5 two invalid tones will be heard when passingthrough menu items 3 and 4.

4.3.4 Menu Item 3 (Not Displayed)

4.3.5 Menu Item 4 (Not Displayed)

4.3.6 Menu Item 5 (Alarm Silence Behavior)

1. This menu item is used to change alarm silence behavior. Three options; 0,1, or 2 can be accessed by first pressing the Upper Alarm Limit button, thenusing the Adjust Up or Down button to scroll to the desired number.

2. Option “0” will allow the operator to select Alarm Silence, but there will bea reminder tone every 3 minutes.

3. Option “1” allows the operator to select Alarm Silence and there will be noreminder tone.

4. Option “2” will not allow the operator to select Alarm Silence.

5. When the desired option is indicated in the display, press the Upper AlarmLimit button to save the current selection. Three tones will sound to indicatethat the change has been accepted

Note: The low battery audible alarm cannot be disabled.

4.3.7 Menu Item 6 (Baud Rate)

1. Baud rates of 2400, 9600, and 19200 can be selected by first pressing theUpper Alarm Limit button, then using the Adjust Up or Adjust Down buttonto select the desired baud rate. The baud rates will be displayed in the%SpO2 window as 24, 96, or 192.


4-4

2. When the desired option is indicated in the display, press the Upper AlarmLimit button to save the current selection. Three tones will sound to indicatethat the change has been accepted.

4.3.8 Menu Item 7

Do not use. For use by Mallinckrodt Customer Service Engineer.

4.3.9 Menu Item 8


4.3.10 Menu Item 9


5-1

SECTION 5: TROUBLESHOOTING

5.1 Introduction5.2 How to Use this Section5.3 Who Should Perform Repairs5.4 Replacement Level Supported5.5 Obtaining Replacement Parts5.6 Troubleshooting Guide5.7 Error Codes

5.1 INTRODUCTION

This section explains how to troubleshoot the NPB-190 if problems arise. Tablesare supplied that list possible monitor difficulties, along with probable causes,and recommended actions to correct the difficulty.

5.2 HOW TO USE THIS SECTION

Use this section in conjunction with Section 3, Performance Verification, andSection 7, Spare Parts. To remove and replace a part you suspect is defective,follow the instructions in Section 6, Disassembly Guide. The circuit analysissection in the Technical Supplement offers information on how the monitorfunctions.

5.3 WHO SHOULD PERFORM REPAIRS

Only qualified service personnel should open the monitor housing, remove andreplace components, or make adjustments. If your medical facility does not havequalified service personnel, contact Mallinckrodt Technical Services or yourlocal Mallinckrodt representative.

5.4 REPLACEMENT LEVEL SUPPORTED

The replacement level supported for this product is to the printed circuit board(PCB) and major subassembly level. Once you isolate a suspected PCB, followthe procedures in Section 6, Disassembly Guide, to replace the PCB with aknown good PCB. Check to see if the symptom disappears and that the monitorpasses all performance tests. If the symptom persists, swap back the replacementPCB with the suspected malfunctioning PCB (the original PCB that was installedwhen you started troubleshooting) and continue troubleshooting as directed inthis section.

5.5 OBTAINING REPLACEMENT PARTS

Mallinckrodt Technical Services provides technical assistance information andreplacement parts. To obtain replacement parts, contact Mallinckrodt or yourlocal Mallinckrodt representative. Refer to parts by the part names and partnumbers listed in Section 7, Spare Parts.

Section 5: Troubleshooting

5-2

5.6 TROUBLESHOOTING GUIDE

Problems with the NPB-190 are separated into the categories indicated in Table5-1. Refer to the paragraph indicated for further troubleshooting instructions.

Note: Taking the recommended actions discussed in this section will correctthe majority of problems you will encounter. However, problems notcovered here can be resolved by calling Mallinckrodt TechnicalServices or your local representative.

Table 5-1: Problem Categories

Problem Area Refer to Paragraph1. Power

• No power-up on AC and/or DC• Fails power-on self-test• Powers down without apparent cause

5.6.1

2. Buttons• Monitor does not respond properly to

buttons

5.6.2

3. Display/Alarms• Displays do not respond properly• Alarms or other tones do not sound

properly or are generated without apparentcause

5.6.3

4. Operational Performance• Displays appear to be operational, but

monitor shows no readings• Suspect readings

5.6.4

5. Serial Port• NPB-190 and PC not communicating

properly• Nurse Call not functioning properly

5.6.5

All of the categories in Table 5-1 are discussed in the following paragraphs.


5-3

5.6.1 Power

Power problems are related to AC and/or DC. Table 5-2 lists recommendedactions to power problems.

Table 5-2: Power Problems

Condition Recommended Action

1. BATTERY LOWindicator lightssteadily while NPB-190 is connected toAC and battery isfully charged.

1. Ensure that the NPB-190 is plugged into an operational ACoutlet and the AC indicator is on.

2. Check the fuses. The Power Entry Module contains thefuses as indicated in paragraph 6.3 and Figure 6-3 of theDisassembly Guide section. Replace if necessary.

3. Open the monitor as described in section 6. Verify powersupply’s output to the battery while on AC. Disconnect thebattery leads from the battery and connect a DVM to them.The voltage measured should be 6.8 VDC + 0.15 and thecurrent should be 400 mA + 80 mA. Replace power supplyif above values are not met.

4. Check the cable connection from the bottom enclosure tothe UIF PCB, as instructed in paragraph 6.5 of theDisassembly Guide section. If the connection is good,replace the UIF PCB.

2. The NPB-190 doesnot operate whendisconnected fromAC power.

1. The battery may be discharged. To recharge the battery,refer to paragraph 3.3.1, Battery Charge. The monitor maybe used with a less than fully charged battery but with acorresponding decrease in operating time from that charge.

2. If the battery fails to hold a charge, replace the battery asindicated in Section 6, Disassembly Guide.

3. BATTERY LOWindicator on duringDC operation andan alarm issounding.

There are 15 minutes or less of usable charge left on theNPB-190 battery before the instrument shuts off. At thispoint, if possible, cease use of the NPB-190 on batterypower, connect it to an AC source, and allow it to recharge.The full recharge takes 14 hours. The NPB-190 maycontinue to be used while it is recharging.

4. Battery does notcharge.

1. Replace battery if more than 2 years old.

2. Open the monitor as described in Section 6. Verify powersupply’s output to the battery while on AC. Disconnect thebattery leads from the battery and connect a DVM to them.The voltage measured should be 6.8 VDC ± 0.15 and thecurrent should be 400 mA ± 80 mA. Replace power supplyif above values are not met.


5-4

5.6.2 Buttons

Table 5-3 lists symptoms of problems relating to nonresponsive buttons andrecommended actions. If the action requires replacement of a PCB, refer toSection 6, Disassembly Guide.

Table 5-3: Button Problems


1. The NPB-190 respondsto some, but not allbuttons.

1. Replace Top Housing assembly.2. If the buttons still do not work, replace the UIF PCB.

2. The NPB-190 turns onbut does not respond toany of the buttons.

1. Check the connection between the membrane paneland J5 of the UIF PCB.

2. Replace Top Housing assembly.3. If the buttons still do not work, replace the UIF PCB.

5.6.3 Display/Alarms

Table 5-4 lists symptoms of problems relating to nonfunctioning displays,audible tones or alarms, and recommended actions. If the action requiresreplacement of a PCB or module, refer to Section 6, Disassembly Guide.

Table 5-4: Display/Alarms Problems


1. Display values aremissing or erratic.

1. Try another sensor or relocate the sensor to adifferent site.

2. If the sensor is connected, replace the sensorconnector assembly.

3. If the condition persists, replace the sensorextension cable.

4. If the condition still persists, replace the UIFPCB.

2. All display segmentsdo not light duringPOST.

1. Check the connection between the UIF PCB andthe Display PCB.

2. If the condition does not change, replace theDisplay PCB.


3. All Front Panel LEDindicators do not lightduring POST.

1. Check the connection between the membranepanel and J5 of the UIF PCB.

2. Replace Top Housing assembly.

4. Alarm sounds for noapparent reason.

1. Moisture or spilled liquids can cause an alarm tosound. Allow the monitor to dry thoroughlybefore using.

2. If the condition persists, replace the UIF PCB.


5-5

Table 5-4: Display/Alarms Problems (cont. from page 5-4)


5. Alarm does not sound. 1. Check speaker connection to UIF PCB.2. Replace the speaker as described in Section 6,

Disassembly Guide.3. If the condition persists, replace the UIF PCB.

Table 5-5 lists symptoms of problems relating to operational performance (noerror codes displayed) and recommended actions. If the action requiresreplacement of a PCB or module, refer to Section 6, Disassembly Guide.

Table 5-5: Operational Performance Problems


1. The Pulse Amplitudeindicator seems toindicate a pulse, but thedigital displays showzeroes.

1. The sensor may be damaged; replace it.


2. SpO2 or pulse rate valueschange rapidly; PulseAmplitude indicator iserratic.

1. The sensor may be damp or may have beenreused too many times. Replace it.

2. An electrosurgical unit (ESU) may beinterfering with performance:

ñ Move the NPB-190 and its cables andsensors as far from the ESU as possible.

ñ Plug the NPB-190 and the ESU intodifferent AC circuits.

ñ Move the ESU ground pad as close to thesurgical site as possible and as far awayfrom the sensor as possible.

3. Verify performance with the proceduresdetailed in Section 3.



5-6

5.6.5 Serial Port

Table 5-6 lists symptoms of problems relating to the serial port andrecommended actions. If the action requires replacement of the PCB, refer toSection 6, Disassembly Guide.

Table 5-6: Serial Port Problems


1. No printout is beingreceived.

1. The unit is running on battery power.Connect to an AC source. If the AC indicatoris not on see section 5.6.1.

2. The monitor’s baud rate does not match theprinter. Change the baud rate of the monitorfollowing instructions in section 4.3.7.

3. Check connections between serial port andprinter (see section A3).


2. The Nurse Call functionis not working.

1. The unit is running on battery power.Connect to an AC source. If the AC indicatoris not on see section 5.6.1.

2. Verify that connections are made betweenpins 5 or 10 (GND) and 11 (Nurse Call) ofthe serial port.

3. Verify that output voltage between groundpin 5 or 10 and pin 11 is -5 to -12 VDC (noalarm) and +5 to +12 VDC (during alarm).



5-7

5.7 ERROR CODES

An error code will be displayed when the NPB-190 detects a non-correctablefailure. When this occurs, the unit will stop monitoring, sound a low priorityalarm that cannot be silenced, clear patient data from the display, and display anerror code. Error codes will be displayed with EEE in the Saturation display andthe number of the code in the Pulse Rate display, i.e., EEE 1. Table 5-7 providesa complete list of error codes and possible solutions.

Table 5-7: Error Codes

Code Meaning Possible Solutions

1 POST failure Replace UIF PCB

4 Battery dead 1. Check the voltage selector switch.

2. Charge battery for 14 hours

3. Leads of battery reversed; see paragraph 6.54. Replace battery

5 Too many microprocessor resetswithin a period of time

1. Replace UIF PCB

2. Replace Power Supply

6 Boot CRC error Replace UIF PCB

7 Error on UIF PCB 1. Cycle power to clear error.

2. Check voltage selector switch for proper setting.

3. Replace UIF PCB

11 Flash ROM corruption Replace UIF PCB

76 Error accessing EEPROM Replace UIF PCB

80 Institutional default values lostand reset to factory defaultvalues

Replace UIF PCB

84 Internal communications error Replace UIF PCB

6-1

SECTION 6: DISASSEMBLY GUIDE

6.1 Introduction6.2 Prior to Disassembly6.3 Fuse Replacement6.4 Monitor Disassembly6.5 Monitor Reassembly6.6 Battery Replacement6.7 Power Entry Module (PEM) Removal/Installation6.8 Power Supply Removal/Installation6.9 Display PCB Removal/Installation6.10 UIF PCB Removal/Installation6.11 Alarm Speaker Removal/Installation

6.1 INTRODUCTION

The NPB-190 can be disassembled down to all major component parts,including:

• PCBs• Battery• Top and Bottom Housing• Speaker• Power Entry Module (PEM)

The following tools are required:

• Phillips-head screwdriver #1• 10 mm open-end wrench• Needle-nose pliers• Torque wrench, 10 inch-pounds (1.13 newton-meters)• Wire Cutters

WARNING: Before attempting to open or disassemble the NPB-190,disconnect the power cord from the NPB-190.

Caution: Observe ESD (electrostatic discharge) precautions when workingwithin the unit.

Note: Some spare parts have a business reply card attached. When you receivethese spare parts, please fill out and return the card.

6.2 PRIOR TO DISASSEMBLY

1. Turn the NPB-190 off by pressing the Power On/Standby button.

2. Disconnect the monitor from the AC power source.

Section 6: Disassembly Guide

6-2

6.3 FUSE REPLACEMENT

1. Complete the procedure in paragraph 6.2.

2. Disconnect the power cord from the back of the monitor.

3. Remove the fuse drawer from the Power Entry Module by pressing down onthe tab in the center and pulling the drawer out as shown in Figure 6-1.

Figure 6-1: Fuse Removal

4. Put new 0.5 amp fuses in the drawer and reinsert the drawer in the powermodule.


6-3

6.4 MONITOR DISASSEMBLY

Caution: Observe ESD (electrostatic discharge) precautions whendisassembling and reassembling the NPB-190 and when handling any of thecomponents of theNPB-190.

1. Set the NPB-190 upside down, as shown in Figure 6-2.

Corner screws

Figure 6-2: NPB-190 Corner Screws

2. Remove the four corner screws.

3. Turn the unit upright. Separate the top case from the bottom case of themonitor being careful not to stress the wire harnesses between the cases.Place the two halves of the monitor on the table as shown in Figure 6-3.

4. Disconnect the Power Supply from J6 on the UIF PCB.


6-4

J6

Power supplyharness

Figure 6-3: Separating Case Halves

6.5 MONITOR REASSEMBLY

1. Place the two halves of the monitor on the table as shown in Figure 6-3 andconnect the Power Supply to J6 on the UIF PCB.

2. Place the top case over the bottom case and align the four outside screwposts and close the monitor.

Caution: When reassembling the NPB-190, hand tighten the screws thathold the cases together to a maximum of 10 inch-pounds. Over-tighteningcould strip out the screw holes in the top case, rendering them unusable.

3. Install the four corner screws.


6-5

6.6 BATTERY REPLACEMENT

Removal

1. Follow procedure in paragraphs 6.2 and 6.4.

2. Remove the two screws from the battery bracket shown in Figure 6-4 andlift the battery out of the bottom case.

3. Use needle-nose pliers to disconnect the leads from the battery.

Figure 6-4: Battery Removal

4. The lead-acid battery is recyclable. Do not dispose of the battery by placingit in the regular trash. Dispose of properly according to state, local or otherapplicable regulations, or contact Mallinckrodt Technical Services to returnfor disposal.

Installation

5. Connect the leads to the battery. The red wire connects to the positiveterminal and the black wire goes to the negative.

6. Insert the new battery into the bottom case with the negative terminaltowards the bottom of the monitor. Install the bracket and grounding leadwith the two screws.



6-6

8. Turn the monitor on and verify proper operation.

6.7 POWER ENTRY MODULE (PEM) REMOVAL/INSTALLATION

Removal

1. Complete the procedure in paragraphs 6.2 and 6.4.

2. While pushing the top of the PEM in from the outside of the case, gentlypush the case to the outside and lift up on the PEM.

3. Use needle-nose pliers to disconnect the leads from the PEM (see Figure 6-5).

G

LN

Figure 6-5: Power Entry Module

Installation

4. Reconnect the three leads. The blue “N” wire, from the power supply goesto the terminal labeled “N” on the PEM. The brown “L” wire, from thepower supply connects to the terminal labeled “L” on the PEM. The centerterminal at the top of the PEM is for the ground wire (Figure 6-6).

5. Install the PEM in the bottom case with the fuse drawer facing down. A tabin the bottom case holds the PEM in place. Insert the bottom wing of thePEM between the tab and the internal edge of the side wall of the bottomcase. Push the PEM down and towards the outside of the monitor until itclicks into place.


6-7

6. Position the ground line from the PEM so that it does not come into contactwith components on the Power Supply PCB.

7. Complete procedure in paragraph 6.5.

6.8 POWER SUPPLY REMOVAL/INSTALLATION

Removal

1. Complete the procedure described in paragraphs 6.2 and 6.4.

2. Disconnect the leads from the battery.

3. Follow the procedure in paragraph 6.7, steps 2 and 3.

4. Use a 10mm wrench to disconnect the Power Supply ground lead from theequipotential lug (Figure 6-6).

5. Remove the seven screws shown in Figure 6-7.

6. Lift the Power Supply out of the bottom case.

W1to

Equipotential Lug

W2Brown to

"L" onPEM

W3Blue to"N" onPEM

W5Black

W4Red

EquipotentialLug

G

LN

Figure 6-6: Power Supply Leads Connections


6-8

Figure 6-7: Power Supply

Installation

7. Reconnect the AC leads. The wire from the Power Supply labeled “N” goesto the terminal labeled “N” on the PEM. The wire from the power supplylabeled “L” connects to the terminal labeled “L” on the PEM.

8. Place the Power Supply in the bottom case.

Caution: When installing the Power Supply, tighten the seven screws to amaximum of 10 inch-pounds. Overtightening could strip out the inserts inthe bottom case, rendering them unusable.

9. Install the seven screws in the Power Supply and tighten.

10. Use a 10mm wrench to connect the power supply ground lead to theequipotential lug. Tighten to 12 inch pounds.

11. Follow the procedure in paragraph 6.7, step 5.

12. Connect the ground wire to the PEM and position it so that it does not comeinto contact with components on the Power Supply PCB.

13. Complete the procedure in paragraph 6-5.


6-9

6.9 DISPLAY PCB REMOVAL/INSTALLATION

Removal


2. Lift the Display PCB up to remove it from the top case (Figure 6-8).

Grounding clip

J4

Figure 6-8: Display PCB

Installation

3. Slide the Display PCB into the grooves in the top case, being careful toalign the male pins from the Display PCB to connector J4 on the UIF PCB.



6-10

6.10 UIF PCB REMOVAL/INSTALLATION

Removal


2. Lift the Display PCB up to remove it from the top case (Figure 6-8).

3. Disconnect the keypad ribbon cable from J5 of the UIF PCB (Figure 6-8).J5 is a ZIF connector, lift up on the outer shell until it clicks, then removethe ribbon cable from the connector.

4. Disconnect the speaker cable from J3 of the UIF PCB.

5. Remove the five screws in the UIF PCB (Figure 6-9).

J5

J3

Figure 6-9: UIF PCB

6. Remove the UIF PCB from the top case.


6-11

Installation

Caution: When installing the UIF PCB, hand-tighten the five screws to amaximum of 10 inch-pounds. Overtightening could strip out the inserts inthe top case, rendering them unusable.

7. Place the UIF PCB in the top case.

8. Install the five screws in the UIF PCB.

9. Lift up on the outer shell of J5 on the UIF PCB until it clicks. Insert thekeypad ribbon cable into J5 of the UIF PCB. Slide the outer shell of J5down until it clicks.

10. Connect the speaker cable to J3 of the UIF PCB.

11. Slide the Display PCB into the grooves in the top case being careful to alignthe male pins from the Display PCB to connector J4 on the UIF PCB.


6.11 ALARM SPEAKER REMOVAL/INSTALLATION

Removal


2. Disconnect the speaker wire harness for J3 on the UIF PCB (see Figure 6-10).

3. Pull the holding clip towards the center of the monitor and lift the speakerfrom the top housing.


6-12

Connect speakerwires to J3 connector

Figure 6-10: Alarm Speaker

Installation

4. Slide the speaker into the plastic holding clip provided in the top housing.

5. Connect the speaker wire harness to J3 on the UIF PCB.

6. Complete the procedure paragraph 6.5.

7-1

SECTION 7: SPARE PARTS

7.1 Introduction

7.1 INTRODUCTION

Spare parts, along with part numbers, are shown below. Item numberscorrespond to the numbers called out in Figure 7-1.

Item Description Part No.1 Top Case Assembly (Membrane Panel Included) 0484282 Fuse Drawer 6915003 Fuses 6910324 Power Entry Module 6914995 Power Supply 0352006 Display PCB 0351967 Battery 6401198 Battery Bracket 0353079 UIF PCB 035192

Sensor Lock (not shown) 022943Alarm Speaker (not shown) 033494Ground Clip (not shown) 035400Rubber Feet (not shown) 4-003818-00Power Cord (not shown) U.S. 071505

International 901862U.K. 901863

Figure 7-1 shows the NPB-190 expanded view with item numbers relating to thespare parts list.

Note: Some spare parts have a business reply card attached. When you receivethese spare parts, please fill out and return the card.

Section 7: Spare Parts

7-2

NPB190

9

8

4

6

1

5

7

2

3

Figure 7-1: NPB-190 Exploded View

8-1

SECTION 8: PACKING FOR SHIPMENT

8.1 General Instructions8.2 Repacking in Original Carton8.3 Repacking in a Different Carton

To ship the monitor for any reason, follow the instructions in this section.

8.1 GENERAL INSTRUCTIONS

Pack the monitor carefully. Failure to follow the instructions in this section mayresult in loss or damage not covered by the Mallinckrodt warranty. If the originalshipping carton is not available, use another suitable carton; North Americancustomers may call Mallinckrodt Technical Services Department to obtain ashipping carton.

Before shipping the NPB-190, contact Mallinckrodt Technical ServicesDepartment for a returned goods authorization (RGA) number. Mark theshipping carton and any shipping documents with the RGA number. Europeancustomers not using RGA numbers, should return the product with a detailed,written description of the problem.

8.2 REPACKING IN ORIGINAL CARTON

If available, use the original carton and packing materials. Pack the monitor asfollows:

1. Place the monitor in a plastic bag (not shown) and, if necessary, accessoryitems in original packaging.

Section 8: Packing for Shipment

8-2

Figure 8-1: Repacking the NPB-190

2. Place in shipping carton and seal carton with packaging tape.

3. Label carton with shipping address, return address and RGA number.

Section 8: Packing for Shipment

8-3

8.3 REPACKING IN A DIFFERENT CARTON

If the original carton is not available, use the following procedure to pack theNPB-190:

1. Place the monitor in a plastic bag.

2. Locate a corrugated cardboard shipping carton with at least 200 pounds persquare inch (psi) bursting strength.

3. Fill the bottom of the carton with at least 2 inches of packing material.

4. Place the bagged unit on the layer of packing material and fill the boxcompletely with packing material.

5. Seal the carton with packing tape.

6. Label the carton with the shipping address, return address, and RGAnumber.

9-1

SECTION 9: SPECIFICATIONS

9.1 General9.2 Electrical9.3 Physical Characteristics9.4 Environmental9.5 Alarms9.6 Factory Default Settings9.7 Performance

9.1 GENERAL

Designed to meet safety requirements of:

UL 2601-1 CSA-C22.2 No. 601-1-M90, IEC 601-1 (Class I, type BF)EMC per EN60601-1-2

9.2 ELECTRICAL

Protection Class

Class I: per IEC 601-1, clause 2.2.4

Degree of Protection

Type BF: per IEC 601-1, clause 2.2.25

Mode of Operation

Continuous

Battery

Type Rechargeable, sealed lead-acid, internal

Operating time 12 hours minimum on new, fully chargedbattery

Recharge period 14 hours for full charge

Fuses 2 each 5 X 20 mmSlow Blow. 0.5 amp, 250 volts

AC Power

Selectable by switch 100-120 VAC 50/60 Hz or 200-240 VAC 50/60 Hz

Section 9: Specifications

9-2

9.3 PHYSICAL CHARACTERISTICS

Dimensions 3.3 in H x 10.4 in W x 6.8 in D8.4 cm H x 26.4 cm W x 17.3 cm D

Weight 5.5 lb2.5 kg

9.4 ENVIRONMENTAL

Operating Temperature 5°C to 40°C (+41°F to +104°F)

Storage Temperature

Boxed -20°C to +70°C (-4°F to +158°F)

Unboxed -20°C to +60°C (-4°F to +140°F)

Operating Atmospheric Pressure 700 hPa to 1060 hPa(20.65 inHg to 31.27 inHg)

Relative Humidity 15% RH to 95% RH, noncondensing

9.5 ALARMSAlarm Limit Range

% Saturation 20–100%

Pulse Rate 30–250 bpm

9.6 FACTORY DEFAULT SETTINGS

Parameter Default SettingSpO2 High Alarm 100%SpO2 Low Alarm 85%High pulse rate Alarm 170 bpmLow pulse rate Alarm 40 bpmAudible Alarm Volume Level 5Audible Alarm Silence Duration 60 secondsPulse Beep Volume Level 4Communication Protocol Serial output mode ASCIIAlarm Silence Behavior Off with a reminderBaud Rate 9600

Section 9: Specifications

9-3

9.7 PERFORMANCE

Measurement Range

SpO2: 0–100%

Pulse/Heart Rate: 20–250 bpm

Accuracy

SpO2Adult: 70–100% ± 2 digits

0–69% unspecified

Neonate: 70–100% ± 3 digits0–69% unspecified

Accuracies are expressed as plus or minus “X” digits (saturation percentagepoints) between saturations of 70-100%. This variation equals plus or minus onestandard deviation (1SD), which encompasses 68% of the population. Allaccuracy specifications are based on testing the subject monitor on healthy adultvolunteers in induced hypoxia studies across the specified range. Adult accuracyis determined with Oxisensor II D-25 sensors. Accuracy for neonatal readings isdetermined with Oxisensor II N-25 sensors. In addition, the neonatal accuracyspecification is adjusted to take into account the theoretical effect of fetalhemoglobin in neonatal blood on oximetry measurements.

Pulse Rate (optically derived) 20–250 bpm ± 3 bpm

Accuracies are expressed as plus or minus “X” bpm across the display range.This variation equals plus or minus 1 Standard Deviation, which encompasses68% of the population.

A-1

APPENDIX (SERIAL PORT INTERFACE PROTOCOL)

A1 IntroductionA2 Enabling the Serial PortA3 Connecting to the Serial PortA4 Real-Time Print OutA5 Nurse call

A1 INTRODUCTION

When connected to the serial port on the back of the NPB-190, a real-timeprintout can be obtained. Data lines are printed at 2 second intervals. Columnheadings will be printed after every 25 lines, or if one of the values in thecolumn heading changes. Changing an alarm limit, for example, would cause anew column heading to be printed. Printouts include patient and device data. Areal-time printout cannot be obtained if the unit is operating on battery power.The real-time printout is discussed in more detail in Paragraph A4.

A2 ENABLING THE SERIAL PORT

Real-time data is constantly being sent to the serial port of the NPB-190 whenthe instrument is operating on AC power. To receive a real-time printout, seeParagraph A3 for instructions to make the connection.

Menu Item 6 is used to change baud rate. Item 6 cannot be accessed when asensor cable is connected to the instrument. To access menu Item 6, press boththe Upper Alarm Limit and the Lower Alarm Limit buttons simultaneously for 3seconds. Next, press the Upper Alarm Limit button until menu Item 6 isdisplayed. The baud rate can then be selected by pressing the Adjust Up orAdjust Down button until the desired baud rate is displayed. A baud rate of 9600is selected as a default value. Other baud rates that can be selected are 2400 and19200.

A3 CONNECTING TO THE SERIAL PORT

Data is transmitted in the RS-232 format. Only three lines are used; GND is theground, TxD represents the Transmit Data Line, and RxD is the Receive DataLine. Data can be transmitted a maximum of 25 feet. The pin outs for the serialport are listed in the chart below.

Table A-1: Serial Port Pin Outs

Pin Line2 RxD3 TxD5,10 GND11 Nurse call1, 4, 6-9, 12-15 No Connection

Appendix

A-2

The pin layouts are illustrated in Figure A-1. The conductive shell is used asearth ground. An AMP connector is used to connect to the serial port. Use AMPconnector (AMP p/n 747538-1), ferrule (AMP p/n 1-747579-2) and compatiblepins (AMP p/n 66570-2).

9 10 11 12 13 14 15

1 2 3 4 5 6 7 8

Figure A-1: Serial Port Pin Layout

The serial cable must be shielded. Connectors at both ends of the serial cablemust have the shield terminated to the full 360 degrees of the connector’s metalshell. If rough handling or sharp bends in the cable is anticipated, use a braidedshield.

A4 REAL-TIME PRINTOUT

When a real-time printout is being received, a new line of data is printed every 2seconds. Every 25th line will be a column heading line. A column heading linewill also be printed any time a value in the column heading line is changed. Areal-time printout is shown below in Figure A-2

NPB-190 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTime Tag %SpO2 PR (bpm) PA Status123456789 100 120 220123456791 100 124 220123456793 100 190 220123456795 100 190* 220 PH123456797 100 190* 220 PH123456799 100 190* 220 PH123456801 100 190* 220 PH123456803 100 190* 220 PH123456805 100 190* 220 PH LB123456807 100 190* 220 PH LB123456809 100 190* 220 PH LB123456811 - - - - - - - - - SD LB123456813 - - - - - - - - - SD LB123456815 - - - - - - - - - SD123456817 - - - - - - - - - SD123456819 - - - - - - - - - SD123456821 - - - - - - - - - SD123456823 - - - - - - - - - PS123456825 - - - - - - - - - PS123456827 - - - - - - - - - PS123456829 - - - - - - - - - PS123456831 - - - - - - - - - PS123456833 - - - - - - - - - PSNPB-190 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTime Tag %SpO2 PR (bpm) PA Status123456835 - - - - - - - - - PSNPB-190 Version 1.0.0 CRC XXXX SpO2 Limit: 80-100% PR Limit: 100-180 bpmTime Tag %SpO2 PR (bpm) PA Status123456837 79* 59* 220 SL PL LB123456839 79* 59* - - - PS SL PL LB

Figure A-2: Real-Time Printout

Appendix

A-3

A4.1 Column Headings

NPB-190 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTime Tag %SpO2 PR (bpm) PA Status

To explain the printout, it will be necessary to break it down to its keycomponents. The first two lines of the chart are the column headings shownabove. Every 25th line will be a column heading. A column heading is alsoprinted whenever a value of the column heading is changed. There are threecolumn heading lines shown in Figure A-2. Using the top row as the startingpoint, there are 25 lines before the second column heading is printed. The thirdcolumn heading was printed because the SpO2 limits changed from 30-100% to80-100%.

Printout Source


Data in the highlighted box above represents the source of the printout, in thiscase the NPB-190.

Software Revision Level


The next data field tells the user the software level, (Version 1.0.0) and asoftware verification number (CRC XXXX). Neither of these numbers shouldchange during normal operation. The numbers will change if the monitor isserviced and receives a software upgrade.

Alarm Limits


The last data field in the top line indicates the high and low alarm limits for%SpO2 and for the pulse rate (PR). In the example above, the low alarm limit forSpO2 is 30% and the high alarm limit is 100%. Pulse rate alarm limits are: low100 bpm, and high 180 bpm.

Column Headings


Actual column headings are in the second row of the column heading line.Patient data presented in the chart is, from left to right: the time that the chartwas printed, the current %SpO2 value being measured, current pulse rate in beatsper minute (bpm), current pulse amplitude (PA), and the operating status of theNPB-190.

Appendix

A-4

A4.2 Patient Data and Operating Status

Time Tag

Time Tag %SpO2 PR (bpm) PA Status123456789 100 120 220

Time Tag does not represent a real-time clock. The number beneath the TimeTag heading represents time, in seconds, since the unit was initialized at thefactory. This number will increase in size throughout the life of the monitor.

Patient Data

NPB-190 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTime Tag %SpO2 PR (bpm) PA Status123456795 100 190* 220 PH

Patient data are highlighted in the display above. Parameter values are displayeddirectly beneath the heading for each parameter. In this example, the %SpO2 is100, and the pulse rate PR is 190 beats per minute. The “*” next to the 190indicates that 190 beats per minute is outside of the alarm limits, indicated in thetop row, for pulse rate. If no data for a parameter is available three dashes (- - -)will be displayed in the printout.

PA is an indication of pulse amplitude. The number can range from 0 to 254 andwill typically range around 45. There are no alarm parameters for this value. Itcan be used for trending information. It is an indication of a change in pulsevolume, pulse strength, or circulation.

NPB-190 Version 1.0.0 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTime Tag %SpO2 PR (bpm) PA Status123456795 100 190* 220 PH

The Status column indicates alarm conditions and operating status of the NPB-190. A Pulse High alarm is indicated by the PH in this example. The statuscolumn can have as many as four codes displayed in one line of data. A completelisting of the status codes is listed in Table A-2.

Table A-2: Status Codes

Code MeaningLB Low BatteryAS Alarm SilenceAO Alarm OffSD Sensor DisconnectPS Pulse SearchLP Loss of PulseSH Sat High Limit AlarmSL Sat Low Limit AlarmPH Pulse rate High Limit AlarmPL Pulse rate Low Limit Alarm

Note: A Sensor Disconnect will also cause three dashes (- - -) to be displayedin the patient data section of the printout.

Appendix

A-5

A5 NURSE CALL

A Nurse Call signal can be obtained by connecting to the serial port. Thisfunction is only available when the instrument is operating on AC power. NurseCall will be disabled when the unit is operating on battery power, or if theaudible alarm is turned off or silenced. The remote location will be signaledanytime there is an active audible alarm.

Pin 11 on the serial port is the Nurse Call signal and pin 10 is ground (see FigureA-1). When there is no alarm condition, the voltage between pins 10 and 11 willbe -5 to -12 VDC. Whenever there is an active audible alarm condition, theoutput between pins 10 and 11 will be +5 to +12 VDC.

S-1

TECHNICAL SUPPLEMENT

S1 IntroductionS2 Oximetry OverviewS3 Circuit AnalysisS4 Functional OverviewS5 AC InputS6 Power Supply PCBS7 BatteryS8 User Interface PCBS9 Front Panel Display PCB and ControlsS10 Schematics

S1 INTRODUCTION

This Technical Supplement provides the reader with a discussion of oximetryprinciples and a more in-depth discussion of NPB-190 circuits. A functionaloverview and detailed circuit analysis is supported by block and schematicdiagrams. The schematic diagrams are located at the end of this supplement.

S2 OXIMETRY OVERVIEW

The NPB-190 is based on the principles of spectrophotometry and opticalplethysmography. Optical plethysmography uses light absorption technology toreproduce waveforms produced by pulsatile blood. The changes that occur in theabsorption of light due to vascular bed changes are reproduced by the pulseoximeter as plethysmographic waveforms.

Spectrophotometry uses various wavelengths of light to qualitatively measurelight absorption through given substances. Many times each second, the NPB-190 passes red and infrared light into the sensor site and determines absorption.The measurements that are taken during the arterial pulse reflect absorption byarterial blood, nonpulsatile blood, and tissue. The measurements that areobtained between arterial pulses reflect absorption by nonpulsatile blood andtissue.

By correcting "during pulse" absorption for "between pulse" absorption, theNPB-190 determines red and infrared absorption by pulsatile arterial blood.Because oxyhemoglobin and deoxyhemoglobin differ in red and infraredabsorption, this corrected measurement can be used to determine the percent ofoxyhemoglobin in arterial blood: SpO2 is the ratio of corrected absorption ateach wavelength.

Technical Supplement

S-2

S2.1 Functional Versus Fractional Saturation

The NPB-190 measures functional saturation, that is, oxygenated hemoglobinexpressed as a percentage of the hemoglobin that is capable of transportingoxygen. It does not detect significant levels of dyshemoglobins. In contrast,hemoximeters such as the IL482 report fractional saturation, that is, oxygenatedhemoglobin expressed as a percentage of all measured hemoglobin, includingmeasured dysfunctional hemoglobins.

Consequently, before comparing NPB-190 measurements with those obtained byan instrument that measures fractional saturation, measurements must beconverted as follows:

functional saturation =

fractional saturation x

100100-(% carboxyhemoglobin +%methemoglobin)

S2.2 Measured Versus Calculated Saturation

When saturation is calculated from a blood gas measurement of the partialpressure of arterial oxygen (PaO2), the calculated value may differ from theNPB-190 SpO2 measurement. This is because the calculated saturation may nothave been corrected for the effects of variables that can shift the relationshipbetween PaO2 and saturation.

Figure S2-1 illustrates the effect that variations in pH, temperature, partialpressure of carbon dioxide (PCO2), and concentrations of 2,3-DPG and fetalhemoglobin may have on the oxyhemoglobin dissociation curve.

010050

Sat

ura

tio

n (

%)

pHTemperaturePCO22,3-DPG

PO2 (mmHg)

100

50

pHTemperaturePCO22,3-DPG

Fetal Hb

Figure S-1: Oxyhemoglobin Dissociation Curve


S-3

S3 CIRCUIT ANALYSIS

The following paragraphs discuss the operation of each of the printed circuitboards within the NPB-190 pulse oximeter. (Refer to the appropriate schematicdiagram at the end of this supplement, as necessary.)

S4 FUNCTIONAL OVERVIEW

The monitor functional block diagram is shown in Figure S4-1. Most of thefunctions of the NPB-190 are performed on the UIF PCB. Functions on the UIFPCB include the SPO2 module, PIC, CPU, and Memory. Other key componentsof the NPB-190 are the Power Entry Module (PEM), Power Supply, and theDisplay PCB.

The Display module consists of the LED display and the Membrane Panel.Contained on the Membrane Panel are enunciators and push buttons, allowingthe user to access information and to select various available parameters. TheDisplay PCB contains; SpO2, heart rate, and Blip Bar LEDs, and their associateddriver circuits.

SPO2 Module

80196CPU

Power SupplyMembrane

Panel

LED Display

PIC

Serial port

Alarm Speaker

BatteryCharger

DCSupply

UIF PCB

PowerEntryModule

Fuses

PatientConnection

Flash ROM64K

System RAM

EEPROM

On/Off Switch

Battery

Figure S-2: NPB-190 Functional Block Diagram

S5 AC INPUT

A selector switch on the back of the NPB-190 allows the user to connect themonitor to AC power ranging from 100 VAC to 240 VAC. The switch has twopositions, one for 100 VAC through 120 VAC and one for 200 VAC through 240VAC. Verify that the switch selection matches the AC power at your locationbefore plugging the monitor into an AC outlet.

AC power enters the NPB-190 through the Power Entry Module (PEM). Boththe Line and Neutral lines are protected by a 0.5 amp fuse. These user-accessiblefuses are located in a fuse drawer, which is part of the PEM located on the backof the monitor.


S-4

S6 POWER SUPPLY PCB THEORY OF OPERATION

The NPB-190 uses an unregulated linear power supply. This power supplyprovides the DC power needed to charge the battery and to power the UserInterFace PCB (UIF). Electro Static Discharge (ESD) protection is also providedby the power supply.

AC power from the PEM is passed through a step-down transformer, T2, whichhas two primary and two secondary windings. If switch SW1 on the back of themonitor is in the 120 VAC position, the primary windings are in parallel. Theprimary windings are in series if SW1 is in the 240 VAC position.

Each secondary winding is fused with a 2.0 amp fuse (F1 and F2). If a shortcircuit should occur in the DC circuitry, these fuses prevent the transformer fromoverheating. The output of the transformer varies, depending on load and input.Voltage measured between the outlet of a secondary winding and ground can befrom 6 to 20 VAC. High frequency noise from the AC line and from the UIFPCB is filtered by C6 and C8 before passing through the bridge rectifier.

The bridge rectifier provides the DC power used in the NPB-190. The positiveoutput is the Main_DC ranging from 7 to 18 VDC. This positive voltage is usedfor the battery circuit and to power the UIF PCB.

S6.1 Battery Circuits

Two circuits are included in this section of the Power Supply PCB. One circuit isused to charge the battery, and the other circuit provides battery protection.

Charging CircuitThe Power Supply will charge the battery any time the NPB-190 is connected toAC power even if the monitor is not turned on. The voltage applied to the batteryis 6.8 ± 0.15 VDC and is current limited to 400 ± 80 mA.

Battery ProtectionTwo types of battery protection are provided by the Power Supply; protection forthe battery and protection from the battery.

SW2 is a resettable component that protects the battery. SW2 opens and turnsthe charging circuit off if the temperature of the battery rises above 50∞ C. If theoutput of the battery exceeds 2.5 amps, F3 opens. F3 protects the battery from ashort to ground of the battery output. F3 cannot be reset.

Protection from the battery is provided in case the battery is connectedbackwards. Should this happen, the output of the battery is shorted to groundthrough CR3. This provides protection for other circuits in the monitor.


S-5

S7 BATTERY

A lead-acid battery is used in the NPB-190. It is rated at 6 VDC 4 amphours.When new and fully charged, the battery will operate the monitor for 12 hours. Anew battery will last 15 minutes from the time the low battery alarm is declareduntil the unit is shut down due to battery depletion.

The battery can withstand 400 charge/discharge cycles. Recharging the battery tofull capacity takes 14 hours.

Change over from AC to battery power will not interrupt the normal monitoringoperation of the NPB-190. When the unit is running on battery power, the serialport will be turned off along with the Nurse Call.

S8 USER INTERFACE PCB (UIF)

The UIF PCB is the heart of the NPB-190. All functions except the unregulatedDC power supply, display, and keypad reside on the UIF PCB. The followingtext covers the key circuits of the UIF PCB.

S8.1 Regulated DC Power Supply

The UIF PCB receives the Main_DC unregulated voltage of 7 to 18 VDC fromthe Power Supply, or 5.8 to 6.5 VDC from the internal battery. The PowerSupply on the UIF PCB generates +10.0, -5.0 and +5.0 VDC.

S8.2 Controlling Hardware

Two microprocessors reside on the UIF PCB. The CPU is an Intel 80C196KC(196) running at 10MHz. The second microprocessor is referred to as the PICand is controlled by the CPU.

CPUThe 196 is the main controller of the NPB-190. The 196 controls the front paneldisplay, data storage, and the SpO2 function. Serial port communication iscontrolled by the 196 with the exception of the Nurse Call. The user interface iscontrolled by the CPU with the exception of the power button.

The SpO2 function is controlled by a pulse width modulator (PWM) functionbuilt into the processor. PWM signals are sent to control the intensity of theLEDs in the sensor and to control the gain of the amplifiers receiving the returnsignals from the photodetector in the sensor.

Analog signals are received from the SpO2 circuit on the UIF PCB. An A/Dfunction in the 196 converts these signals to digital values for %SpO2 and heartrate. The values are then displayed and stored.

User’s interface includes the front panel display and the keypad. By pressing anyof five keys on the keypad the operator can access different functions of theNPB-190 (the power switch is not controlled by the 196). The 196 will recognizethe keystroke and make the appropriate change to the monitor display to beviewed by the operator. Any changes made by the operator are used by the


S-6

monitor until it is turned off. Default values will be restored when the unit ispower-on again.

Patient data is stored by the NPB-190 and can be downloaded to a printerthrough the serial port provided on the back of the monitor. An in-depthdiscussion of the serial port is covered in the Appendix of this manual.

PICPrimary responsibilities of the PIC include monitoring and controlling the NPB-190ís power, and generating sounds.

Since the PIC monitors and controls system power, the Power On/Standbyswitch is interfaced with the PIC. When the Power On/Standby switch is pressed,the PIC sends power to the circuits within the NPB-190. The PIC will determineif the unit is running on AC, or battery power, and illuminate the properindicator. The serial port and nurse call functions are disabled by the PIC if theunit is running on battery power.

Battery voltage is checked periodically by the processor. A signal from theprocessor turns the charging circuit off to allow this measurement to be taken. Ifthe processor determines that the battery voltage is below 5.85 ± 0.1 VDC, a lowbattery alarm is declared by the PIC. If battery voltage on the UIF PCB ismeasured below 5.67 ± 0.1 DCV, the monitor will display an error code andsound an audible alarm. (Voltages measured at the battery will be slightly higherthan the values listed above). The user will be unable to begin monitoring apatient if the battery voltage remains below this point. If either event occurs,plug the unit into an AC source for 14 hours to allow the battery to fullyrecharge.

When the NPB-190 is powered by AC, the nurse call function is available. If noalarm conditions exist, the output will be -5 to -12 VDC. Should an alarmcondition occur, the output will be +5 to +12 VDC.

When the CPU sends a tone request, three items are used to determine the tonethat is sent by the PIC to the speaker. First, pulse tones change with the %SpO2value being measured. The pulse beep tone will rise and fall with the measured%SpO2 value. Second, three levels of alarms, each with its own tone, can occur,High, Medium, and Low priority. Third, the volume of the alarm is useradjustable. Alarm volume can be adjusted from level 1 to level 10, with level 10being the highest volume.

A time clock is provided by the NPB-190. The PIC is powered at all times tosupport this function. To conserve power, the PIC enters a low-power sleepmode when the instrument is powered down.

S8.3 Sensor Output/LED Control

The SpO2 analog circuitry provides control of the red and IR LEDs such that thereceived signals are within the dynamic range of the input amplifier. Becauseexcessive current to the LEDs will induce changes in their spectral output, it issometimes necessary to increase the received signal channel gain. To that point,the CPU controls both the current to the LEDs and the amplification in the signalchannel.


S-7

At initialization of transmission, the LED’s intensity level is based on previousrunning conditions, and the transmission intensity is adjusted until the receivedsignals match the range of the A/D converter. If the LEDs reach maximumoutput without the necessary signal strength, the PWMs will increase the channelgain. The PWM lines will select either a change in the LED current or signalgain, but will not do both simultaneously.

The LED drive circuit switches between red and IR transmission and disablesboth for a time between transmissions in order to provide a no-transmissionreference. To prevent excessive heat build-up and prolong battery life, each LEDis on for only a small portion of the duty cycle. Also, the frequency of switchingis well above that of motion artifact and not a harmonic of known ACtransmissions. The LED switching frequency is 1.485 kHz. The IR transmissionalone, and the red transmission alone, will each be on for about one-fifth of theduty cycle; this cycle is controlled by the CPU.

S8.4 Input Conditioning

Input to the SpO2 analog circuit is the current output of the sensor photodiode. Inorder to condition the signal current, it is necessary to convert the current tovoltage.

Because the IR and red signals are absorbed differently by body tissue, theirreceived signal intensities are at different levels. Therefore, the IR and redsignals must be demodulated and then amplified separately in order to comparethem to each other. Demultiplexing is accomplished by means of two circuitsthat alternately select the IR and red signal. Selection of the circuits is controlledby two switches that are coordinated with the IR and red transmissions. A filterwith a large time constant follows to smooth the signal and remove noise beforeamplification.

S8.5 Signal Gain

The separated IR and red signals are amplified so that their DC values are withinthe range of the A/D converter. Because the received IR and red signals aretypically at different current levels, the signal gain circuits provide independentamplification for each signal as needed. The gain in these circuits is adjusted bymeans of the PWM lines from the CPU.

After the IR and red signals are amplified, they are filtered to improve thesignal-to-noise ratio and clamped to a reference voltage to prevent the combinedAC and DC signal from exceeding an acceptable input voltage from the A/Dconverter.

S8.6 Variable Gain Circuits

The two variable gain circuits are functionally equivalent. The gain of eachcircuit is contingent upon the signal’s received level and is controlled to bringeach signal to approximately 3.5 V. Each circuit uses an amplifier and oneswitch in the triple SPDT analog multiplexing unit.


S-8

S8.7 AC Ranging

In order to achieve a specified level of oxygen saturation measurement and tostill use a standard type combined CPU and A/D converter, the DC offset issubtracted from each signal. The DC offsets are subtracted by using an analogswitch to set the mean signal value to the mean of the range of the A/D converterwhenever necessary. The AC modulation is then superimposed upon that DClevel. This is also known as AC ranging.

Each AC signal is subsequently amplified such that its peak-to-peak values spanone-fifth of the range of the A/D converter. The amplified AC signals are thenfiltered to remove the residual effects of the PWM modulations and, finally, areinput to the CPU. The combined AC and DC signals for both IR and red signalsare separately input to the A/D converter.

S9 FRONT PANEL DISPLAY PCB AND CONTROLS

S9.1 Display PCB

Visual patient data and monitor status is provided by the Front Panel DisplayPCB. At power up, all indicators are illuminated to allow verification of theirproper operation.

There are two sets of three 7-segment displays. One set displays %SpO2 and theother displays pulse rate. A decimal point immediately to the right of eitherdisplay indicates that an alarm limit for that parameter is no longer set at thepower on default value.

In between the two 7-segment displays is a 10-segment blip bar. The blip barilluminates with each pulse beat. The number of segments illuminated indicatethe relative signal strength of the pulse beat. A tone will accompany each pulsebeat. The sound of the tone will change pitch with the %SpO2 level beingmeasured.

Four LEDs and icons are also located on the Front Panel Display PCB. An LEDilluminated next to an icon indicates a function that is active. Functions indicatedby the LEDs are AC/Battery Charging, Low Battery, Alarm Silence active, andPulse Search.

S9.2 Membrane Keypad

A membrane keypad is mounted as part of the top case. A ribbon cable from thekeypad passes through the top case and connects to the UIF PCB. Six keys allowthe operator to access different functions of the NPB-190.

These keys allow the user to select and adjust the alarm limits, cycle power tothe unit, and to silence the alarm. Alarm volume and alarm silence duration canalso be adjusted via the keypad. A number of other functions can be accessed bypressing the Upper and Lower Alarm Limit buttons simultaneously and thenselecting the desired option with the Adjust Up or Adjust Down button. Thesefunctions are discussed in greater detail in Section 4.


S-9

S10 SCHEMATIC DIAGRAMS

The following schematics are included in this section:

Figure DescriptionS-3 Front End Red/IR Schematic Diagram

S-4 Front End LED Drive Schematic Diagram

S-5 Front End Output Schematic Diagram

S-6 Front End Power Supply Schematic Diagram

S-7 Isolation Barrier EIA-232 Port Schematic Diagram

S-8 CPU Core Schematic Diagram

S-9 PIC and Speaker Schematic Diagram

S-10 Indicator Drive Schematic Diagram

S-11 Core Power Supply Schematic Diagram

S-12 Parts Locator Diagram for UIF PCB

S-13 Display PCB Schematic Diagram

S-14 Parts Locator Diagram for Display PCB

S-15 Power Supply Schematic Diagram

S-16 Parts Locator Diagram for Power Supply PCB

S-11

Figure S-3 Front End Red/IR Schematic Diagram (1 of 10)035191

FRONT END RED/IR

IR CHANNEL

AD822 BYPASS

DG201S BYPASS

RED CHANNEL

TP2

I172

-5V

I171 I22

I8

U674HC00S

4

5

7

14

6

OFF/ON

0.01UC22

VREF

VREF

G_IRDC

G_REDDC

I24

I23

I21

I20

TP9

TP4

TP11

TP5

TP3

TP10

TP6

TP7

TP8

I18

I16

G_PWM2G_MUX1

I6 U12DG201S

V+

V-GND

10

5

9

11

13

4

I3

LF444CMU10

-

+

-

+

11

47

6

5

U10LF444CM

-

+

-

+

3

21

4

11

U10LF444CM

-

+

-

+

12

1314

4

11LF444CMU10

-

+

-

+

11

48

9

10

AD822U4

-

+

+

-

4

87

5

6

Z5U

C7

0.1U

1N914SCR2

133

1

R17100K

VREF

VCC

U1

CD4053S

Z1 3Z0 5

Z4

Y1 1Y0 2

Y15 XO 12

X1 13

X14

VSS8

VEE7

VCC16 INH 6

C 9B 10A 11

35

4

12

1513

14

8

7

16

91011

LF441SU7

2

36

1

5

8

7

4

+

-2

36

1

5

8

7

4

AD822U4

-

+

+

-

4

81

3

2

C200.01U

VCC

R13100K

R12100K

+10V

-5V

+10V

+10V

+10V

2.00KR6

VREF

88.7K_0.1%R9

-5V

-5V

-5V

R81.00M

+10V

-5V

R1582.5K 1N914S

CR4

133

1

-5V

VREF

82.5KR16

-5V

+10V

C24220P

Q72N3906S

2

311

3

2

VREF

+10VVREF

0.12UC25

100KR4

+10V

C160.068U

220PC15

2N3906SQ6

2

31

2

31

+10VVREF

C140.12U

R1100K

R5100K

VREF

-5V

CR11N914S

13

13

+10V

+10V

25V

3216

C10.47U

+

20V

C5622U

7343

+

-5V

+10V

C190.01U

0.01UC21

C280.068U

100KR14

-5V

0.068UC26

0.068UC18

R2100K

CR31N914S1

31

3

-5V

G_LEDDR

DG201SU12

V+

V-GND

4

13

3

1

5

2

R751.1K

88.7K_0.1%R10

I2

U12DG201S

V+

V-GND

4

13

6

8

5

7

I4

SAMPIR

I5

SAMPRED

I1

I10

-5V

I11

I12

I14

PWM2

I15

3.32KR11

R33.32K

0.47UC2

3216

25V +

VREF

I17

I13

IRLED/AV

I7

I9

I19

C270.12U

0.12UC17

VREF

1000PC23

C131000P

U674HC00S

3

14

7

2

1

I173

1.00KR77

1.00KR109

I25

I26

S-13

Figure S-4Front End LED Drive Schematic Diagram (2 of 10)

035191

LED DRIVE

FRONT END LED DRIVE

100KR24

OFF/ON

C38 22P

R26100K

CR5 1N914S

13 13

1N914SCR6

133 1

I50

I47

PHOTOI

I52

I49

I48I45

I38

I36

I30

TP19

TP18

TP17

TP14

TP12

-5V

G_PWM2

G_PWM1

DG201SU12

V+

V-GND

4

13

14

16

5

15

Z5U

C90.1U

VCC

182KR43

VCC

VCC VCC

0.022UC42

R42100K

0.1UC41

20.0KR41

C400.022U

100KR40

C390.1U

R3920.0K

511KR37

Q3

2

13

2N3904S1

3

2

R3622.1K

R3410.0K

10.0R33

10.0KR32

MPSA06SQ2

2

3

11

2

3

R3140.2K

Q1MPSA06S

2

3

1

3

2

1

Q10

MPSA56S

2

3

1

2

3

1

VREF

R306.04K_0.1%

+10V

1.00MR29

AD822U5

+

-6

57

8

4

R28182K

0.047UC37

VREF

AD822U5

+

- 2

31

8

4

+10V

-5V

VREF

MPSA56SQ9

2

3

11

3

2

C36390P

C350.047U

18PC34

0.01UC33

R23182K

10.0KR20

LT1013SU11

-

+

+

-2

65

4

3

U11LT1013S

-

+

+

-

1

87

6

2

VCC

2N3906S

Q82

31

3

2

14.7PC29

U2

CD4053S

Z13Z05

Z 4

Y11Y02

Y 15XO12

X113

X 14

VSS 8

VEE 7

VCC 16INH6

C9B10A1111

109

6 16

7

8

14

1312

21

4

53

0.1UC8

Z5U

VREF

R253.32K

I27

280KR27

R442.74K

R182.74K

10.0KR35

I33

I35

I34

I39

I32

I40

I43 I44

I37

I28

I46

R3815.8K

I31

R1910.0K

I42

I51

C30100P 100P

C31 C32100P

VREF

R2210.0K

J1

CON_DB9F

9

8

7

6

5

4

3

2

11

10

11

10

11

2

3

4

5

6

7

8

9

RSENS

RSENS

LEDDIS

-5V

+10V

IR/RED IR/RED

R213.32K

G_LEDDR

S-15

Figure S-5Front End Output Schematic Diagram (3 of 10)

035191

CK06

0.015U

C5I96

C461000P

I72

I71

34.8KR54

I69I68

IRDC

I63

I61

REDLED/AV

REDLED/AV

I56 I55

REDDC

REDAC

PWM0

TP20

TP21

100KR46

R45100K

12.1KR55

3.32KR49

R473.32K

R603.32K

100KR62

R593.32K

3.32KR50

R52100K

3.32KR53

G_IRDC

VCCVCC+10V

U674HC00S

9

10

7

14

8

LMC6044SU9

+

-

-

+5

67

4

11

LMC6044SU9

+

-

-

+

1314

4

11

12

U13DG201S

V+

V- GND

4

13

3

1

5

2

DG201SU13

V+

V-GND

4

13

14

16

5

15

C6GUARD

VCC

VCC +10V

-5V-5V

C430.1U

15.0KR48

U3

CD4053S

Z13Z05

Z 4

Y11Y02

Y 15XO12

X113

X 14

VSS 8

VEE 7

VCC 16INH6

C9B10A11

R513.32K

+5.7V

-5V

+5.7V

+10V

VREF

R5615.0K

VREF

R5712.1K

+10V

+5.7V

-5V

+5.7V

34.8KR58

3.32KR61

+10V

C510.01U

DG201SU13

V+

V- GND

4

13

6

8

5

7

LMC6044SU9

+

-

-

+3

11

41

2

CK060.015U

C6

0.01UC52

25V

3216

C30.47U

+

VREF

VCC

0.01UC55

VCC

DG201SU13

V+

V-GND

10

5

9

11

13

4 C5GUARD

LMC6044SU9

+

-

-

+

98

4

11

10

-5V

C540.01U

0.01UC53

7343

22UC57

20V

+

G_REDDC

C490.01U

0.01UC48

C450.01U

C440.01U

25V

3216

C40.47U

+C50

0.1U

74HC00SU6

11

14

7

13

12

VREF

PWM1

G_MUX1

G_PWM1

I58

I59

I57

ZERO-L

I62

I64

IRAC

I65

I67

I54

I70

1000PC47

I60

Guard Ring

Guard Ring

DG201S SPARESDG201S BYPASS

S-17

Figure S-6Front End Power Supply Schematic Diagram (4 of 10)

035191

4.99KR65

CURRENT

HIGH

TP22

0.1UC59

Z5U

7343

C6447U10V

+

VCC

VDD

I85

10V47UC65

7343

+

7343

C6347U10V

+

I83

I82

RAW-5V

I80

I78

TP15

TP23

TP16

VFB

11.5KR63

U14

FB 2

GND7

6 GNDS

NFB 3

4 S/S

VC1 VIN 5

VSW 8

LT1373S

8

51

4

3

6

7

2

C61330P

36.5KR66

R7149.9

0.1UC58

Z5U

Z5U

C120.1U

U8

2 GND13 GND2

6GND37GND4

VIN8 1VOUT

78L05D

18

76

32

20V

7343

22UC69

+

R7010.0K

Q5

2

13

2N3904S2

31

Q4

2

13

2N3904S1

3

2

VREF

5%1.0R69

-5V

+5.7V

7343

22UC68

20V

+

VREF

+10V

7343

22UC67

20V

+

182R68

CR7

MBRS130

1 221

MBRS130CR9

122 1

VCC

49.9R67

20V

C7022U

7343

+

7343

22UC66

20V

+Z5U

C100.1U

CR101N914S

133

1 0.1UC11

Z5U

5%

C621000P

R6449.9

I73

I76

I77

I79

RAW+10V I81

VIN

I29

I84

C6010U16V

+

T1LPE-4841

1

8

6

37

2

5

44

5

2

7 3

6

8

1

MBRS130

CR8

12 12I75

VSW

I41

TP28

S-19

035191

clockshigh power

EIA-232 PortISOLATION BARRIER

SH1 BD MTG HOLE

E

4.7UC74

35V

+I192

TXDOUT

I99

I97

IGNDTP24

I87

VMINUS

VMINUS

EXCOM-SHTDWN

100M

TH

R76

1/4W

DT1600VTH

DTRLDR

TX

6N136U18

TH

7

6

8

2

553

2

8

6

7

DTR

CR16BAV99

3

1

3

2

BAV99CR15

21

33

CR14BAV99

21

33

22VSMCJ22CCR11

21

21

R744.02K

4.02KR73

VDD

U15

13V-

V+ 2

11T2OUT

T2DIN4

T1OUT 12

3 T1DIN

RTRI 8

R2LDR6 R2IN

5 R1LDR

R1IN 10

ISO_GND14

7 BYP

AC1

MAX251S

1

7

14

10

596

8

3

12

4

11

2

13

1N914CR12

13 3 1

U164N26

45

6

12TH

451

2 6

VDD

6N136U17

TH

7

6

8

2

355 3

2

8

6

7

IBAV99CR13

21

33

U19

EN8

R1OUT9

R2OUT12

SHDN1

PWR14

D2 13

R2DIN 11R1DIN 10

GND 7

T2LDR 6T2IN5T1IN4 T1LDR 3

D1 2

MAX250S

8

912

1

1413

1110

7

64 3

2

SCHOTT 67129080T2

6

43

2

1 6

43

2

1

RXDIN

RXDLDR

NURSE-CALLTXD

RXD

TP31

TP29

I86

C721.0U20V

+

VPLUS

VPLUS

20V1.0UC73

+

I98

TP26

NCALOUT

J2

CON_DB15F

16

1

8

7

6

5

4

3

15

2

14

13

12

11

10

9

1717

9

10

11

12

13

14

2

15

3

4

5

6

7

8

1

16

RXD232

I

I88

R7210.0K

IGND

L21 600R

L22600R

L23600R

C893300P

50VC711.0U20V

+

50V2200PC75

C1173300P

50V

CLKDRV2

CLKDRV1

0.1U

C76Z5U

I238

I237

TXDLDR

Figure S-7Isolation Barrier EIA-232 Port Schematic Diagram (5 of 10)

S-21

Figure S-8 CPU Core Schematic Diagram (Sheet 6 of 10)

035191

RST-L

SPARES

ADDRESS DECODING - MEMORY MAPPING

EXTERNAL OUTPUT PORT

DISPLAY CONNECTOR

for U30

CPU CORE

EXTERNAL OUTPUT PORT0000 - EFFF

ROM - 0000 - EFFF

RAM - F000 - FFFF

IS NOT AVAILABLEONLY IF ATP-SMHC49S IS USED

ADDRESS LATCHING

Bypass cap

I185I184

I181

EEPEN

I182

10.0K

R131

R101

10.0K

10.0KR78

10.0KR92

R117 2.21K

221R89

R111 221

R88121

R110121

R87 121

R86 121

R75 121

I109I108

U41 74HC08S

10

98

I53

74HC08SU28

5

46

I92

U4174HC08S

64

5

74HC08SU41

2

13

LEDEN

RST-L

0.1UC118

10MHZY2

ATP-SM

144 1

IIC_SCK

I229I228I227

U21

74HC573S

1 OCC11

8Q 128D97Q 137D86Q 146D75Q 155D64Q 165 4D3Q 174 3D2Q 183 2D1Q 192 1D2

3456789

111

ALE

ADDR7AD7ADDR6AD6ADDR5AD5ADDR4AD4ADDR3AD3ADDR2AD2ADDR1AD1ADDR0AD0

VDD

10V47UC116

7343

+

I163

I174I170

I107I105I103

U20

74HC573S

1 OCC11

8Q 128D97Q 137D86Q 146D75Q 155D64Q 165 4D3Q 174 3D2Q 183 2D1Q 192 1D2

3456789

111

LEDENPICEN_L

I179

EXOUTEN-L

I178RST-L

U34

74HC02S

12

3

VDD

I169WR-L

ALE

RD-L

WR-L

I167

I164

I161I162

I74I89

ADDR13ADDR12ADDR11

ADDR0

I149

AD8

AD6

I126

VREF

C820.1U

I102 I104 I106 I101

10V47UC102

7343

+

RWD_RST

Y510MHZ

21

HC49S

21

VDD

VDD

VDD

Q11SI99534

6 5

3

VDD

J4

CON_7X2

98765432

1413121110

1

98642

141210

1

0.1UC91

WR-L

PORTSEL-L

ADDR15ADDR14

ADDR13ADDR12

22PC90

0.1UC78

C9522P

0.1UC81

U25

74HC20S

6

54

21

Q11SI99532

8 7

1

U27

80C196KC

6 ACH0/P0.05 ACH1/P0.17 ACH2/P0.24 ACH3/P0.3

11 ACH4/P0.410 ACH5/P0.5

8 ACH6/P0.69 ACH7/P0.7

60AD059AD1

50AD1049AD1148AD1247AD13

AD14 4645AD15

58AD257AD356AD455AD554AD653AD752AD851AD9

12 ANGND

65CLKOUT

14GND136GND268GND3

24 HSI0HSI125

26HSI2/HSO427HSI3/HSO5

28HSO029HSO134HSO235HSO3

63INST

P1.01920 P1.1

P1.22122 P1.3/PWM123 P1.4/PWM2

P2.0/TXD1817 P2.1/RXD

P2.2/EXTINT1544 P2.3/T2CLK

P2.4/T2RST4239 P2.5/PWM033 P2.6/TWUP-DN

P2.7/T2CAPT38

PWR1

37 VPPVREF13

67XTAL166XTAL2

62ADV

30 BREQ31 HLDA32 HOLD

61RD

41WRH/BHE

40WRL/WR

ALE/

P1.5/P1.6/P1.7/

64 BUSWIDTH

2 EA

3 NMI

16 RESETREADY43

25

18

3833

24

43

272635342928

6423

16

32

474849

313023222120

5051525354555657585960

19

98

1011

4

657

121337

65

6667

1

683614

63

4546

4041

62

61

1715444239

U30

~RST 6

RST 5

LTC1232

VCC 8

TOL3

TD2 ST 7

PBRST1

GND4

6

5

8

3

2 7

1

4

U25

74HC20S

8

1312

109

TP33

U34

74HC02S

108

9

U34

74HC02S

1311

12

I100

WD_RST

TP32I91

I110

ADDR15ADDR14ADDR13ADDR12ADDR11ADDR10ADDR9ADDR8

ALE

AD15AD14AD13AD12AD11AD10AD9AD8

0.1UC77C80

0.1U

0.1UC83

VDD

VDD

TP35

TP36

RAD15RAD14RAD13RAD12RAD11RAD10RAD9RAD8RAD7RAD6RAD5RAD4RAD3RAD2RAD1RAD0I113

I114

I116I115

I120I119

I118I117

I128I127I125

I124I123

I122I121


EXOUTEN-L

I144I143

I142I141

I140I139I138

I137I136

I135I134

I133I132

I131I130 AD0

AD1AD2AD3AD4AD5

AD7

AD9AD10AD11AD12AD13AD14AD15I129 ADDR15

ADDR14

ADDR10ADDR9

ADDR7

ADDR5ADDR4ADDR3ADDR2ADDR1

I159I158

I157I156

I155I154

I153I152

I151I150

I148I147

I146I145

ADDR6

ADDR8

I160

RD-LALEI168

SPI_SCKSPI_MOSI

I175

I111I112

I177

I183

BATT_INDPSRCH_INDAL_SIL_IND

VDD

U29

74HC574S

OC1

CLK11

8Q 128D97Q 137D86Q 146D75Q 155D64Q 164D53Q 173D42Q 182D31Q 191D2

16

1

11

98765432

12131415

171819

TP34

VDD

I226

4700P

L6

1 2

3 44

21

L7 0.95ULEDDIS

IR/RED0.95UL8

0.95UL9RWD_RST

L10 0.95UPWM1

0.95UL11PWM2

L12 0.95U

0.95UL13PORTSEL-L

L15 0.95UTXD

0.95UL14

L16 0.95USAMPRED

0.95UL17

0.95UL18

OFF/ON

SAMPIRSPI_MOSI

I90

I93

VDD

U28

74HC08S

1112

13

U28

74HC08S

89

10

TP25

VDD

TP27

RAMEN-L

C940.1U

VDD

RP2120

910111213141516

7654321

8

16151413121110

9

RP1120

910111213141516

8765432

910111213141516 1

AD0AD1AD2AD3AD4AD5AD6AD7AD8AD9AD10AD11AD12AD13AD14AD15

BTN_5BTN_4PICINTRXD

IRDCREDACREDDC

IRACRSENSBTN_1BTN_2BTN_3

IRLED/AV

RAMEN-L SPI_SCKPHOTOI

REDLED/AVZERO-L

SPI_MISO

RAD0RAD1RAD2RAD3RAD4RAD5RAD6RAD7RAD8RAD9RAD10RAD11RAD12RAD13RAD14RAD15RALE-L

RRD-LRWR-L

CLK_OUT

196PWR

50V

470PC79

I166

I231

I224

I230

ROMEN-L

I234

I233

IIC_SCK

I221IICDATA

PWM0PICINTSPI_MISO

VDD

IICDATA

RST-L

DISP_DATA

I176

I66

I239U41

74HC08S

1112

13

I242

S-23

035191

Figure S-9PIC and Speaker Schematic Diagram (Sheet 7 of 10)

U22 N190PIC

VSS18

OSC2OSC19

1 MCLRVDD20

12RC1

RA46

RA023 RA1

RA24

RA35

21RB0RB1 22

23RB2RB3 24

25RB4RB5 26

27RB6RB7 28

PIC16C62

7 RA5

18RC7RC6 17

16RC5RC4 15

14RC3RC2 13

11RC0

19 VSS219

11

131415161718

7

2827262524232221

5432

6

12

201

910

8

UPPER MEMORY - 2000 - 3FFF

LOWER MEMORY - 0000 - 1FFF

SPEAKER DRIVER

7343

C10547U10V

+

7343

C10347U10V

+

R10010.0K

R9610.0K

R104 100R95 100

4.99KR93

R98150K

U31 FLASH

64KX16

A024

A125

A1036

A1137

A1238

A1339

A1440

A1541

A226

A327

A428

A529

A630

A731

A832

A935

CE3

D021

D1 20

9D108D117D126D135D144D15

D2 19

D3 18

D4 17

D5 16

D6 15

D7 1411D810D9

12GND1GND2 34

OE22

PWR 44

WE43

2425

363738394041

2627282930313235

3

2120

987654

1918171615141110

1234

22

44

43

I225

I193

Y1

32.768KHZ

14

ECPSM29T

4 1

I189 PWR_STATUS

PWRIND-L

PICPWR

I204

I203

I201

I198

RP3

10K

1234 5

678

PICPWR

C850.1U

0.1UC93

10.0KR80

R7910.0K RAMEN-L

RD-LWR-L


ADDR13ADDR12ADDR11ADDR10ADDR9ADDR8ADDR7ADDR6ADDR5ADDR4ADDR3ADDR2ADDR1ADDR0

10V47UC101

7343

+

0.1UC92

10V47UC104

7343

+

C870.1U

0.1UC86

22PC99C98

22P

VDD

VDD

VDD

U24 8KX8

A01

A12

A23

GND 4

PWR 86 SCL

SDA5

WP7

AT24C64S

4

5

6 8

321

7

U32 32KX8

A010

A19

A1021

A11232 A12

A13261 A14

A28

A37

A46

A55

A643 A7

A825

A924

CE20 14GND

O0 1112O113O215O316O417O518O619O7

OE22

28PWR

27 WE

55257S

109

2123

226

1

876543

2524

20 14

1112131516171819

22

28

27

U28

74HC08S

2

13

0.1UC84

IICDATA

IICDATA

IIC_SCK

EEPEN

TP37

Y39.83MHZ

21

HC49S

1 2

Y49.83MHZ

ATP-SM

1 44

1N914S

CR20

13

13

U23 8KX8

A01

A12

A23

GND 4

PWR 86 SCL

SDA5

WP7

AT24C64S

4

5

6 8

321

7

U34

74HC02S

6

54

I94

PICPWR

VDD

33PC100 C97

33P

EXCOM-SHTDWN

PICEN_L

PICINT

PICPWR

RST-L

VDD

I186

I187

332R81

I188

I197

I190

I202

SRAMPWR

I194

I195

I196

I191

FREQNURSE-CALL

SPI_MISOSPI_MOSI

SPI_SCK

CRIT_BATT-LLOW_BATT-L

AC_OK-LPWR_BTN

PWR_CTRLBATT_CHECK

PWM_VOL

VDD

221R130

10.0KR91

PICPWR

L20

0.9

5U

L19

0.9

5U

RD-L

FLASHWR-L

ROMEN-L

ADDR1ADDR2

ADDR11ADDR12ADDR13ADDR14ADDR15

ADDR3ADDR4ADDR5ADDR6ADDR7ADDR8ADDR9ADDR10

AD0AD1

AD10AD11AD12AD13AD14AD15


FLASHPWR

1.00KR133

I199

VDD

R102100K

I200

6.49KR99

U266GND1

7 N.C.

1 VCC

VI22

VI44VO1 5

VO2 8

TDA7052A

TH

3GND2

85

6

24

1

37

20V1.0U

C96+

VDD

VDD

I95

1.00KR132

PWM_VOL

FREQ

PORTSEL-L

U40TC7S32F

5

3

2

144

1

2

3

5WR-L

FLASHWR-L

VDD

U39

-

+

+

-

TLC27L2

2

31

8

4

U39

-

+

+

-

TLC27L2

6

57

8

4

Z5UC88

0.1U

I235I236

J3

CON_2R

2112

I165

10V47UC110

7343

+

7343

C12047U10V

+

7343

C12147U10V

+

S-25

035191

Figure S-10Indicator Drive Schematic Diagram (Sheet 8 of 10)

R8510.0K

R9010.0K

R12910.0K

4.75KR84

4.75KR83

R824.75K

4.75KR94

PULSE SEARCH IND DRIVE CKT

AC LED DRIVE CIRCUIT

ALARM SILENCE INDICATOR DRIVE CKT

BATTERY IND DRIVE CKT

MEMBRANE PANEL CONNECTOR

VDDVREF

BTN_3

BTN_2

BTN_1BTN_4

I207I206

I205

VDD

CR19

13

1N914S

1PWRIND-L

ACIND_L

CR21

13

1N914S

3 1

10KRP4

1 2 3 4

8 7 6 5

1 2 3 4

8 7 6 5

RAL_SIL_IND

RBATT_INDRPWR_IND

BATT_IND

PSRCH_IND

AL_SIL_IND

249R97

VDD

Q122N3906S

2

31

2

31

RPWR_IND

Q142N3906S

2

31

2

31

VDD

Q132N3906S

2

31

2

31

Q152N3906S

2

31

2

31

RAL_SIL_IND

R103249

249R105

RPSRCH_IND

RBATT_IND

R106249

PICPWR

PWR_BTN

CON_FLEX13

J5

13

98765432

1110

1

1213

98765432

1110

1

12

BTN_5

RPSRCH_IND

VDD

PICPWR

I209 I208

I211 I210

I213 I212

S-27

035191

Figure S-11Core Power Supply Schematic Diagram (9 of 10)

Sh 9

Sh 8

Critical at approx 5.68V

Low at approx 5.85V

To Linear Power Supply

HIGH to turn ON

Normally HIGH, active LOW

Normally HIGH, active LOW

VDD outputLOW to enable

PICPWR

R11610.0M

10.0KR140

R137100K

CR241N914S

133

1

I215

R139100K

I214

TP46

ACIND_L

10.0MR115

10.0MR113

MBRS330T3

CR23

12 12

SI9953Q16

1

2

78

SI9953Q16

65

4

3

AC_OK

VDD

100KR138

R123

100K

127KR114

CR26

1 3

1N914S

3

VDD

BATT

BATT

AC_OK-L

U35

-

+

+

-

LM393S

1

4

8

2

3

CR25

BAT54

3 11

R13610.0M

R108

6.81K

R107200K

0.1UC114

0.1UC119

C1130.1U

20.0KR112

MBRS330T3

CR17

122 1

CR22VC1206

5.6V

122

1

VDD

U36

Requires Heatsink NPB #891196

3OUT1 IN

5

HSG1

2

CS

4

LM2940H

TH 2 5

1 3

I241

I232

249KR119

100KR125

R134

10.0K

Q18

2

13

2N3904S

31

2

Q17

3

21 2N7002S1

2

3

C1091U35V

+

VDD

U38

-

+

+

-

LM393S5

6

8

4

7

U38

-

+

+

-

LM393S

1

4

8

2

3

U35

-

+

+

-

LM393S5

6

8

4

7

V_REF

R12049.9K

I223

I220

I217

TP39GND

TP38VDD

PICPWRTP1

4.99KR128

VDD

U33

GND2

42

GND1

3OUT1 IN

MIC5200-5

42

31

R1271000.22U

C106

50V

R126332K

C107470U16VTH

+

R1244.99K

U37LT1009S

86

5

4

R122

150K

10.0KR121

4.99KR118

C10810U16V

+

VDD

CR181N914S

13 13

PWR_CTRL

CRIT_BATT-L

PICPWR

J6

CON_4L_156

4321

BATT_CHECK

I216

TP47

I218

TP42

TP43

I222

TP13

VDD

VDD

LOW_BATT-L

C1110.1U

0.1UC112

20V1.0UC115

+

I219

MAIN_OUT

MAIN_OUT

R135100K

VDD

MAIN_DC1

I180

I240

PICPWR

S-29

035192

Figure S-12 Parts Locator Diagram for UIF PCB (10 of 10)

TOP SIDE BOTTOM SIDE

NELLCOR PURITAN BENNETTNPB-190 MAIN BOTTOM SIDE

NELLCOR PURITAN BENNETTNPB-190 MAIN TOP SIDEFAB 035190 REV A

S-31

Figure S-13Display PCB Schematic Diagram (1 of 2)

035195

VDD

TP2 VDD

PULSE RATESpO2

IICDATA

TH

0.1U

C1C247U10VTH

+

IIC_SCK

LEDEN

VDD

DS6

THNKR141SC

E4

A10

B9

C8

1 CA16 CA2

D5

DP7

F2

G3E

DC

BG

F

A

DP

324

7

5

61

89

10

J1

CON_7X2R235

98765432

1413121110

1

98642

1413121110

1

TP1GND

DIG7

DIG8

1000PC3

TH

DS7 TH

HDSP-4830

12

13

14

15

16

17

18

19

11

20

9

8

7

6

5

4

3

2

10

11

10

2

3

4

5

6

7

8

9

20

11

19

18

17

16

15

14

13

12

DS2

7 DPG 3

CA11

10 A9 B8 C5 D4 E2 F3 G

A

FG

B

CD

E

NKR141SC TH

F 2E 4

DP 7

D 5

CA26

C 8B 9A 10

61

7324589

10 109854237

DS3

7 DPG 3

CA11

10 A9 B8 C5 D4 E2 F3 G

A

FG

B

CD

E

NKR141SC TH

F 2E 4

DP 7

D 5

CA26

C 8B 9A 10

61

7324589

10 109854237

DS4

7 DPG 3

CA11

10 A9 B8 C5 D4 E2 F3 G

A

FG

B

CD

E

NKR141SC TH

F 2E 4

DP 7

D 5

CA26

C 8B 9A 10

61

7324589

10 109854237

DS5

7 DPG 3

CA11

10 A9 B8 C5 D4 E2 F3 G

A

FG

B

CD

E

NKR141SC TH

F 2E 4

DP 7

D 5

CA26

C 8B 9A 10

61

7324589

10 109854237

DIG6DIG5

SEGC

SEGD

SEGE

SEGF

SEGG

SEGDP

DIG1

SEGDPSEGGSEGFSEGESEGDSEGCSEGBSEGA

DIG1DIG2DIG3DIG4DIG5DIG6DIG7DIG8

SEGASEGBSEGCSEGDSEGESEGFSEGGSEGDP

DIG3

DS1

7 DPG 3

CA11

10 A9 B8 C5 D4 E2 F3 G

A

FG

B

CD

E

NKR141SC TH

F 2E 4

DP 7

D 5

CA26

C 8B 9A 10

61

7324589

10 109854237

DIG2

SEGB

DIG4

33.2KR9

TH

U1

MAX7219

SEGG 17SEGF 15

21SEGE

SEGDP 22

SEGD 23SEGC 20SEGB 16

14SEGA

PWR19

LOAD12

ISET18

4 GND2GND19

24DOUT

DIN1DIG7 8

5DIG6DIG5 10

3DIG4

7DIG3

6DIG2

11DIG1DIG0 2

CLOCK13

TH

9

17

24

22

152123201614

851037611219

4

13

12

1

18

SEGA

S-33

Figure S-14Parts Locator Diagram for Display PCB (2 of 2)

035196

NELLCOR PURITAN BENNETTNPB-190 DISPLAY TOP SIDE

S-35

035199

Battery Charge

HIGH CURRENT VIAS

ESD Protection

Power Entry

Fan Control

230V

115V

Nellcor # 891196

To Fan

Requires Heat Sink

Battery -

Main Board

Battery +

BATT_OUT

Q6

3

21 2N7002S

2

3

TH2ASB

F3

I12

NEUTRAL

I10

MPSA56Q5

1

3

22

3

1

F2

2ASB TH

I9

I8

10.0KR14 10.0K

R3 CR7

1 3

1N914S

1 3

R1610.0K

CHG_OUT

CR6

13

1N914S

3 1

R7154K

100KR6

Q2

TH2

1

3

4

IRF9510

2

3

1

CHG_IN

R1310.0K

Q3

MPSA56

1

3

2

1

3

2

10.0KR12

U2

4LM385S

8

4

8

10.0KR11

1/2W

R101.50

TH

BATT+

TH

Q42N3904

2

1

32

1

3

MBRS330T3CR4

122

1

T2

OB24-9TH

15

1312

108

63

1

10

12

15

13

8

63

1

FAC-

FAC+

MAIN_DCMAIN_DC

AC-

AC+

0.01UC8

DT1600V TH

I3

W522GA_BLK

18GA_BRNW2

22GA_ORN

W6

W9

22GA_RED

22GA_WHT

W7

W118GA _GRN/YEL

E

BATT_CHK

FAN_CTRL

0.1UC10

100MTH

R2

1/4W

I2

TP1

1/2W

R1390K

TH

LINE

NEUT_IN

LINE_IN

EPS2PC3

SW1

TH

6

5

3 2

11

2

4 5

6

SW2MTS50BTH

NC

T1

E3490ATH

429 7

2 479

E

LM358U1

-

+

+

-

4

81

3

2

0.01UC6

J1

CON_2L

21

TP2GND

250V4700P

C2

TH

C1220P250VTH

C3

250VTH

220P

THQ12N3904

2

1

33

1

2

I1

GBU8BBR1

TH

4 1

3

2

4 1

3

2

CR522V

SMCJ22C21

21

1N4702CR1

TH15V

21

21C5

15000U35VTH

+

BATT_CHK

499R4

1.00KR8

10.0KR22

U3

TH

3 GND

1 VIN2VOUT

LM35D

31

2

1.00KR9

C9

TH

100U35V

+

CR222VSMCJ22C2

112

FAN_CTRL

10.0KR17

C4100P

C70.1U

0.1U

C11

R2010.0K

1/4W

49.9

TH

R24

TH

1.00KR5

1/2W

LM358U1

-

+

+

-6

57

8

4

R2510.0M

R2173.2K

R191.00K

10.0KR23

49.9KR15

18GA_BLUW3

W8

22GA_BLK

22GA_REDW4

I5

I6

E

I7

VREF

TH2ASB

F1I11

MAIN_DC

I4

Figure S-15Power Supply Schematic Diagram (1 of 2)

S-37

"+"

"-"

"GND"

"N"

"L"

NE

LLC

OR

PU

RIT

AN

BE

NN

ET

TN

PB

-190

LP

S T

OP

SID

E

035200

Figure S-16Parts Locator Diagram for Power Supply PCB (2 of 2)

pulsoximeter

Documents

trademarks of mallinckrodt

mallinckrodt patent

nellcor puritan bennett

battery replacement

list of figures

disassembly guide

replacement level

replacement parts