Nellcor NPB-3900 User manual

SERVICE MANUAL

Nellcor Puritan Bennett

™

NPB-3900 Patient Monitor

To contact Nellcor Puritan Bennett’s representative: In the United States, call 1-800-NELLCOR or 510 463-4000; outside the United States, call your local Nellcor Puritan Bennett representative.

Caution: Federal law (U. S.) restricts this device to sale by or on the order of a physician.

0123

Corporate Headquarters

Regional/Local Offices

Nellcor Puritan Bennett Inc. 4280 Hacienda Drive Pleasanton, California 94588 U.S.A. Tel. 510 463-3900 or 1-800-NELLCOR

U. S. Service Repair Center

Nellcor Puritan Bennett Inc. 2200 Faraday Avenue Carlsbad, California 92008 U.S.A. Tel. 619 482-5000

European Office

Nellcor Puritan Bennett Europe BV Hambakenwetering 1

5231 DD ’s-Hertogenbosch The Netherlands Tel. +31.73.6485200

Asia/Pacific Office

Nellcor Puritan Bennett HK Ltd. Room 1602 Evergo House 38 Gloucester Road Wanchai Hong Kong Tel. +852.2529.0363

Nellcor Puritan Bennett UK Ltd. 10, Talisman Business Centre London Road Bicester, Oxfordshire OX6 0JX United Kingdom Tel. +44.1869.322700

Nellcor Puritan Bennett Belgium NV/SA Interleuvenlaan 62/8, Zone 2 B-3001 Heverlee Belgium Tel. +32.16.400467

Nellcor Puritan Bennett France 3 avenue du Canada, Bâtiment Sigma LP851 Les Ulis 91975 Courtaboeuf Cedex France Tel. +33.1.69.82.14.66

Nellcor Puritan Bennett Germany GmbH Black-&-Decker-Strasse 28 65510 Idstein Germany Tel. +49.6126.5930

Nellcor Puritan Bennett Italia S.r.L. Via Edison 6 20090 Assago (MI) Italy Tel. +39.2.4577161

Nellcor Puritan Bennett Finland Oy Kappelitie 8 02200 Espoo Finland Tel. +358.9.270.92.900

To obtain information about a warranty, if any, for this product, contact Nellcor Puritan Bennett Technical Services or your local Nellcor Puritan Bennett representative.

Nellcor Puritan Bennett, Durasensor, Oxisensor II, Oxichip, C-Lock, and the Nellcor Puritan Bennett knob configuration are trademarks of Nellcor Puritan Bennett Incorporated.

SureTemp is a trademark of Welch Allyn, 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; 4,928,692; 4,934,372; 5,078,136; 5,368,224; 5,632,555; Re.35,122.

TABLE OF CONTENTS

List of Figures List of Tables

List of Figures..................................................................................................v

List of Tables..................................................................................................vi

Section 1: Introduction....................................................................................1-1

1.1 Manual Overview..................................................................................1-1

1.2 Warnings, Cautions, and Notes ........................................................... 1-1

1.3 NPB-3900 Patient Monitor Description................................................1-1

1.4 P-3900 Introduction.............................................................................. 1-2

1.5 Related Documents..............................................................................1-2

Section 2: Routine Maintenance .................................................................... 2-2

2.1 Cleaning............................................................................................... 2-2

2.2 Periodic Safety and Functional Checks...............................................2-2

2.3 Battery..................................................................................................2-2

2.4 Environmental Protection..................................................................... 2-3

Section 3: Performance Verification..............................................................3-1

3.1 Introduction .......................................................................................... 3-1

3.2 Equipment Needed .............................................................................. 3-1

3.3 Performance Tests...............................................................................3-2

3.4 Safety Tests.......................................................................................3-15

Section 4: Power-Up Defaults Menu and Diagnostic Mode......................... 4-1

4.1 Introduction .......................................................................................... 4-1

4.2 Power-Up Defaults Menu..................................................................... 4-1

4.3 Restoring Factory Settings................................................................... 4-4

4.4 Diagnostic Mode .................................................................................. 4-4

Section 5: Troubleshooting ............................................................................ 5-1

5.1 Introduction .......................................................................................... 5-1

5.2 How to use This Section ...................................................................... 5-1

5.3 Who Should Perform Repairs .............................................................. 5-1

5.4 Replacement Level Supported............................................................. 5-1

5.5 Obtaining Replacement Parts..............................................................5-2

5.6 Troubleshooting Guide......................................................................... 5-2

5.7 Troubleshooting the Oximetry Function.............................................5-11

5.8 P-3900 Troubleshooting Guide..........................................................5-17

Section 6: Disassembly Guide........................................................................6-1

6.1 Introduction .......................................................................................... 6-1

6.2 How to use This Section ...................................................................... 6-2

6.3 Disassembly Flow Charts.....................................................................6-2

6.4 Closed Case Disassembly...................................................................6-7

6.5 Front Case Disassembly.................................................................... 6-16

6.6 Rear Case Disassembly.....................................................................6-20

6.7 Main PCB Disassembly......................................................................6-22

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

7.1 Introduction .......................................................................................... 7-1

7.2 Top Level Assembly............................................................................. 7-1

7.3 Front Case Assembly........................................................................... 7-2

7.4 Rear Case Assembly ........................................................................... 7-2

7.5 Main PCB Assembly ............................................................................ 7-3

Table of Contents

iii

Table of Contents

7.6 P-3900 Printer...................................................................................... 7-4

Section 8: Packing For Shipment................................................................... 8-1

8.1 General Instructions............................................................................. 8-1

8.2 Repacking In Original Carton............................................................... 8-1

8.3 Repacking In a Different Carton........................................................... 8-1

Section 9: Specifications ................................................................................ 9-1

9.1 General ................................................................................................9-1

9.2 Safety Standards..................................................................................9-1

9.3 Electrical...............................................................................................9-2

9.4 Environmental......................................................................................9-2

9.5 Measuring Parameters.......................................................................... 9-2

9.6 Trends.................................................................................................. 9-7

9.7 P-3900 Printer (Optional).....................................................................9-7

Section 10: RS-232 Interface.........................................................................10-1

10.1 Serial Interface Connection.............................................................. 10-1

10.2 Nurse Call ........................................................................................ 10-1

10.3 Exporting Trend Data....................................................................... 10-2

Appendix - Technical Supplement..................................................................A-1

A-1 General................................................................................................A-1

A-2 Block Diagram.....................................................................................A-1

A-3 Isolated Patient Connection Section....................................................A-2

A-4 Temperature Measurement Circuit......................................................A-4

A-5 ECG Inputs..........................................................................................A-7

A-6 On/Off Power Control..........................................................................A-9

A-7 Audio Volume and Speaker Drive .....................................................A-11

A-8 Power Supplies..................................................................................A-12

A-9 NIBP Section.....................................................................................A-17

A-10 System A/D......................................................................................A-20

A-11 Buttons And Lights ..........................................................................A-22

A-12 SpO

2................................................................................................A-22

A-13 Microcontroller.................................................................................A-28

A-14 Program Storage/Execution ............................................................A-32

A-15 Dram Control...................................................................................A-33

A-16 Real Time Clock (RTC) ...................................................................A-34

A-17 Uart Operation.................................................................................A-36

A-18 FPGA Glue Logic.............................................................................A-37

LIST OF FIGURES

Table of Contents

Figure 5-1: Preamplifier and PGA Outputs......................................................5-12

Figure 5-2: Filter Outputs and ADC Input ...................................................... 5-513

Figure 5-3: SpO Figure 5-4: SpO Figure 5-5: SpO

2 Module with an SRC-2......................................................... 5-14

2 Module with SRC-2 Drive Current Test at TP7....................5-15

2 Module with SRC-2.............................................................. 5-16

Figure 6-1: Top Level Disassembly Flow Chart.6-Error! Bookmark not defined.

Figure 6-2: Front Case Disassembly Flow Chart...............................................6-4

Figure 6-3: Rear Case Disassembly Flow Chart................................................6-5

Figure 6-4: Main Board Disassembly Flow Chart .............................................. 6-6

Figure A-1: NPB-3900 Block Diagram...............................................................A-2

Figure A-2: Temperature Measurement Circuit .................................................A-6

Figure A-3: ECG Processing Circuitry, First Stage............................................A-8

Figure A-4: ECG Processing Circuitry, Second Stage.......................................A-9

Figure A-5: Power ON/OFF Circuitry...............................................................A-10

Figure A-6: Watchdog Circuitry........................................................................A-11

Figure A-7: Audio Volume Circuitry..................................................................A-12

Figure A-8: Buck Power Regulator, Simplified Schematic & Waveforms........A-13

Figure A-9: Battery Charger Circuitry...............................................................A-14

Figure A-10: 3.3V Regulated Supply................................................................A-15

Figure A-11: 5V Regulated Supply Circuitry....................................................A-15

Figure A-12: LCD Bias Supply Circuitry...........................................................A-16

Figure A-13: LCD Backlight Supply Circuitry...................................................A-16

Figure A-14: Isolated ±5V Supply Circuitry......................................................A-17

Figure A-15: NIBP Power Sourcing Circuitry...................................................A-17

Figure A-16: NIBP Pump Control Circuitry.......................................................A-18

Figure A-17: NIBP Pressure Sensors Processing Circuitry.............................A-19

Figure A-18: Proportional Valve Powering Circuitry.........................................A-20

Figure A-19: A/D Circuitry................................................................................A-21

Figure A-20: Interfacing with SpO2 Processing...............................................A-23

Figure A-21: Microcontroller Signal Assignments............................................A-29

Figure A-22: Flash Timing Parameters............................................................A-32

Figure A-23: DRAM Timing Parameters..........................................................A-33

Figure A-24: RAS and CAS Timing..................................................................A-34

Figure A-25: Read Timing................................................................................A-35

Figure A-26: Write Timing................................................................................A-35

Figure A-27: Data Signal..................................................................................A-37

Figure A-28: Control Signal..............................................................................A-37

Figure A-29: NPB-3900 Top Assembly Drawing (Sheet 1 of 2).......................A-43

Figure A-29: NPB-3900 Top Assembly Drawing (Sheet 2 of 2).......................A-45

Figure A-30: NPB-3900 Front Case Assembly Drawing (Sheet 1 of 2)...........A-47

Figure A-30: NPB-3900 Front Case Assembly Drawing (Sheet 2 of 2)...........A-49

Figure A-31: NPB-3900 Rear Case Assembly Drawing...................................A-51

Figure A-32: P-3900 Assembly Drawing..........................................................A-53

Figure A-33: NPB-3900 Interconnect Diagram................................................A-55

Figure A-34: Main PCB Schematic Diagram (Sheet 1 of 5).............................A-57

Figure A-34: Main PCB Schematic Diagram (Sheet 2 of 5).............................A-59

Figure A-34: Main PCB Schematic Diagram (Sheet 3 of 5).............................A-61

Figure A-34: Main PCB Schematic Diagram (Sheet 4 of 5).............................A-63

Figure A-34: Main PCB Schematic Diagram (Sheet 5 of 5).............................A-65

Figure A-35: NPB-3900Patient Connector PCB Schematic Diagram..............A-67

Table of Contents

LIST OF TABLES

Table 1-1: Model Configuration..........................................................................1-2

Table 3-1: Required Test Equipment................................................................. 3-1

Table 3-2: SRC Settings and NBP-3900 Indications.........................................3-6

Table 3-3: Serial Interface Measurements....................................................... 3-13

Table 3-4: Current Test....................................................................................3-16

Table 3-5: Leakage Current............................................................................. 3-16

Table 4-1: Power-Up Defaults Menu..................................................................4-1

Table 4-2: A/D Channel Designators.................................................................4-7

Table 5-1: Problem Categories.......................................................................... 5-2

Table 5-2: Power Problems ............................................................................... 5-3

Table 5-3: Serviceable Hardware Error Codes..................................................5-5

Table 5-4: Error Code Categories...................................................................... 5-8

Table 5-5: Buttons/Knob Problems.................................................................... 5-9

Table 5-6: Display/Audible Tones Problems...................................................... 5-9

Table 5-7: Operational Performance Problems ............................................... 5-10

Table 5-8: Fault Evaluation.............................................................................. 5-11

Table 5-9: P-3900 Troubleshooting Guide....................................................... 5-17

Table 7-1: Top Level Assembly ......................................................................... 7-1

Table 7-2: Front Case Assembly ....................................................................... 7-2

Table 7-3: Rear Case Assembly........................................................................ 7-2

Table 7-4: Main Board Assembly....................................................................... 7-3

Table 7-5: Main PCB Jumper Configuration......................................................7-3

Table 7-5: P-3900 Printer...................................................................................7-4

Table 10-1: RS-232 Serial Interface Connections.............................................7-1

Table A-1:

Oxichip

Circuit Pin Descriptions.....................................................A-23

SECTION 1: INTRODUCTION

1.1 Manual Overview

1.2 Warnings, Cautions, and Notes

1.3 NPB-3900 Patient Monitor Description

1.4 P-3900 Introduction

1.5 Related Documents

1.1 MANUAL OVERVIEW

This manual contains information for servicing the NPB-3900 series of patient monitors. Only qualified service personnel should service this product. Before servicing the NPB-3900, read the operator’s manual carefully for a thorough

understanding of operation.

1.2 WARNINGS, CAUTIONS, AND NOTES

This manual uses three terms that are important for proper operation of the monitor: Warning, Caution, and Note.

1.2.1 Warning

A warning precedes an action that may result in injury or death to the patient or user. Warnings are boxed and highlighted in boldface type.

1.2.2 Caution

A caution precedes an action that may result in damage to, or malfunction of, the monitor. Cautions are highlighted in boldface type.

1.2.3 Note

A note gives information that requires special attention.

1.3 NPB-3900 PATIENT MONITOR DESCRIPTION

The purpose and function of the NPB-3900 series of patient monitors is to monitor: ECG; heart rate; noninvasive blood pressure (systolic, diastolic, and mean arterial pressures); functional arterial oxygen saturation; and temperature for adult and pediatric patients in all hospital areas and hospital-type facilities. They may be used during hospital transport and in mobile, land-based environments, such as ambulances.

Refer to the NPB-3900 operator’s manual for a description of the NPB-3900 controls, indicators, and operation. The physical and operational characteristics of the monitors are described in the operator’s manual and Section 9, Specifications, of this manual.

The parameter measurements for each model in the NPB-3900 series are indicated in Table 1-1.

1-1

Section 1: Introduction

Model Parameter

NPB-3910 X X

NPB-3920 X X X

NPB-3930 X X X

NBP-3940 X X X X

1.4 P-3900 INTRODUCTION

The P-3900 is an optional, standalone printer designed for use with the NPB-3900 patient monitor. The P-3900 communicates with the monitor using a

null-modem cable connected between each device’s RS-232 connector. The P-3900 contains an internal battery, which, when fully charged, will operate the

printer for 3 hours (typical, at 25°C, producing fifteen 20-second printouts per hour). The P-3900 can be connected to AC power using an external power supply. The P-3900 uses the same type power supply as the NPB-3900 monitor, the PS-120V or PS-240V.

Table 1-1: Model Configuration

NIBP SpO2 TEMP ECG

The P-3900 does not have an On/Off switch. The printer can sense when it has an established communications link with the monitor. At that time, the green LINKED indicator on the front panel lights, indicating that the printer is ready for operation. See the NPB-3900 operator’s manual for more information regarding use of the printer.

1.5 RELATED DOCUMENTS

To perform test and troubleshooting procedures and to understand the principles of operation and circuit analysis sections of this manual, you must know how to operate the monitor. Refer to the NPB-3900 operator’s manual. To understand the various Nellcor Puritan Bennett sensors, ECG leads, blood pressure cuffs, and temperature probes that work with the monitor, refer to the operator’s manual and individual directions for use that accompany these accessories.

1-2

SECTION 2: ROUTINE MAINTENANCE

2.1 Cleaning

2.2 Periodic Safety and Functional Checks

2.3 Battery

2.4 Environmental Protection

2.1 CLEANING

WARNING: Do not spray, pour, or spill liquid on the NBP-3900, its accessories, connectors, switches, or openings in the chassis. Do not immerse the NPB-3900 or its accessories in liquid or clean with caustic or abrasive cleaners.

To clean the NPB-3900, dampen a cloth with a commercial, nonabrasive cleaner and wipe the exterior surfaces lightly. Do not allow any liquids to come in contact with the power connector or switches. Do not allow any liquids to penetrate connectors or openings in the instrument. For cables, sensors, and cuffs, follow the cleaning instructions in the directions for use that accompany these accessories.

2.2 PERIODIC SAFETY AND FUNCTIONAL CHECKS

Nellcor Puritan Bennett recommends that the following checks be performed at least every 2 years by a qualified service technician.

1. Inspect the exterior of the NPB-3900 for damage.

2. Inspect labels for legibility. If the labels are not legible, contact Nellcor

Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative.

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 fails these electrical safety tests, do not attempt to repair. Contact Nellcor Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative.

2.3 BATTERY

If the NPB-3900 has not been used for a long period of time, the battery will need charging. To charge the battery, connect the NPB-3900 to an AC source as described in the Setup & Use section of the operator’s manual.

NOTE: Storing the NBP-3900 for a long period without charging the battery

may degrade the battery capacity. A complete battery recharge when not using the monitor requires 8 hours. The battery may be recharged while the monitor is in use; in which case, the battery will require 14 hours to be recharged. The battery may require a full charge/discharge cycle to restore normal capacity.

2-1

Nellcor Puritan Bennett recommends that the NPB-3900’s sealed, lead-acid

battery be replaced at 2-year intervals. Refer to Section 6, Disassembly Guide.

2.4 ENVIRONMENTAL PROTECTION

Follow local governing ordinances and recycling plans regarding disposal or recycling batteries and other device components.

Section 3: Performance Verification

2-3

SECTION 3: PERFORMANCE VERIFICATION

3.1 Introduction

3.2 Equipment Needed

3.3 Performance Tests

3.4 Safety Tests

3.1 INTRODUCTION

This section discusses the tests used to verify performance following repairs or during routine maintenance. All tests can be performed without removing the NPB-3900 covers.

If the NPB-3900 fails to perform as specified in any test, repairs must correct the problem before the monitor is returned to the user.

3.2 EQUIPMENT NEEDED

Table 3-1 lists the equipment required for performance verification.

Table 3-1: Required Test Equipment

Equipment Description

Digital multimeter (DMM) Fluke Model 87 or equivalent Sensor extension cable EC-8

Durasensor® finger clip sensor Oxisensor® II adhesive sensor

DS-100A D-25

ECG cable CE-10 ECG electrodes Standard ECG leads LE series NIBP hose SHBP-10 NIBP cuff SCBP series Temperature probe Welch Allyn SureTemp® (blue capped

probe) Pulse oximeter tester Nellcor Puritan Bennett SRC-2 ECG simulator Dynatech Nevada medSim 300 or

equivalent NIBP simulator Bio-Tek “BP Pump” or equivalent

Thermometer Calibrator Key Welch Allyn Model 767 Safety analyzer Bio-Tek 601 Pro or equivalent Stopwatch Manual or electronic

3-1

Section 3: Performance Verification

3.3 PERFORMANCE TESTS

The battery charge and battery performance tests should be performed before monitor repairs whenever the battery is suspected as being a source of a problem. All other tests should be performed following monitor repairs. Before performing the battery performance test, ensure that the battery is fully charged (paragraph 3.3.1).

This section is written using Nellcor Puritan Bennett factory-set power-up defaults. If your institution has reconfigured custom defaults, those values will be displayed.

3.3.1 Battery Charge

Perform the following procedure to fully charge the battery.

1. Connect the monitor to an AC power source using the PS-120 or PS-240 external power supply and power cord, if needed.

2. Verify that the EXTERNAL POWER indicator is lit.

3. Charge the battery for at least 8 hours. The battery may require a complete charge/discharge cycle to restore its normal capacity.

4. To check for a full charge, perform the procedure in paragraph 3.3.2

“Battery Performance Test.”

3.3.2 Battery Performance Test

The monitor is specified to operate typically on battery power for a minimum of 4 hours, at 25°C, with one NIBP measurement every 15 minutes. Before performing this test, ensure that the battery is fully charged (paragraph 3.3.1).

1. Connect the Nellcor Puritan Bennett SRC-2 pulse oximeter tester to the monitor via the EC-8 sensor cable. Connect the NIBP simulator to the monitor via the SHBP-10 hose.

2. Set the SRC-2 switches as follows:

SWITCH

POSITION

RATE 38 LIGHT LOW MODULATION LOW RCAL/MODE RCAL 63/LOCAL

3- 2

3. Set the NIBP simulator to simulate a pressure setting of 120/80 mmHg and heart rate of 80 bpm.

4. Ensure that the monitor is not connected to AC power.

Section 3: Performance Verification

5. With the NPB-3900 turned off, press the ON/STANDBY button and verify that the battery icon appears at the bottom of the display after the power-on self-test is completed. The boxes in the battery icon should all be filled, indicating the battery is charged.

6. Verify that the monitor is responding to the SpO2 simulator signal and that the audible alarm is sounding. Use the knob to select the SpO

Menu and permanently silence the SpO2 audible alarm.

7. Use the knob to select the NIBP Menu and set the Automatic Measurement Interval to 15 minutes. Exit the menu and press the front panel NIBP button to manually initiate the first NIBP measurement. Subsequent NIBP measurements will be taken automatically every 15 minutes.

8. The monitor must operate for at least 4 hours before the monitor automatically powers down due to low battery condition.

9. Verify that the low battery alarm occurs 15-30 minutes before the battery fully discharges.

10. Allow the monitor to operate until it automatically powers down due to low battery condition. Verify that an audible alarm sounds when the monitor automatically shuts down. Press the alarm silence button to terminate this audible alarm.

11. If the monitor passes this test, immediately recharge the battery

3.3.3 Power-On Self-Test

1. Connect the monitor to an AC power source using the PS-120 or PS-240

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

3. Observe the monitor front panel. With the monitor off, press the

(paragraph 3.3.1, steps 1–3).

power supply and power cord, and verify that the EXTERNAL POWER indicator is lit.

ON/STANDBY button. The monitor must perform the following sequence.

a. The monitor emits a beep. b. A few seconds later, the display backlight illuminates, but the display

is blank.

c. The Nellcor Puritan Bennett logo then appears for a few seconds,

with the version numbers of the boot and operational software displayed in the lower left corner of the display. (The upper version number corresponds to the boot software, the lower version number corresponds to the operational software.)

d. A beep signals the end of the power-on self-test. The power-on self-

test takes approximately 10 seconds to complete.

e. Upon successful completion of the power-on self-test, the display will

be in the normal monitoring screen configuration. No vital-sign numeric values or trend values will be displayed.

3-3

Section 3: Performance Verification

3.3.4 Hardware and Software Tests

Hardware and software testing includes the following tests applicable to the indicated models in the series.

• 3.3.4.1 SpO

• 3.3.4.2 Operation with an ECG Simulator — NPB-3930, NPB-3940

• 3.3.4.3 Verification of Pneumatic System — NPB-3900

• 3.3.4.4 Operation with a Temperature Simulator — NPB-3920, NPB-3940

• 3.3.4.5 General Operation — NPB-3900

3.3.4.1 SpO

2 Testing (NPB-3900)

2 testing includes the following tests.

SpO

• 3.3.4.1.1 Alarms and Alarm Silence

• 3.3.4.1.2 Heart Rate Tone Volume Control

• 3.3.4.1.3 Dynamic Operating Range

• 3.3.4.1.4 LED Excitation Test

3.3.4.1.1 Alarms and Alarm Silence

1. Connect the SRC-2 pulse oximeter tester to the EC-8 sensor extension cable and connect the cable to the monitor. Set the SRC-2 as follows:

2 Testing  NPB-3900

SWITCH

POSITION

RATE 38 LIGHT LOW MODULATION OFF RCAL/MODE RCAL 63/LOCAL

2. Press the ON/STANDBY button to turn the monitor on. After the normal power-up sequence, verify that the SpO

2% display initially indicates zero

or is blank.

NOTE: The pulse bar may occasionally indicate a step change as the monitor is

in the pulse search mode.

3. Move the modulation switch on the SRC-2 to LOW.

4. Verify the following monitor reaction:

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

b. Initially, zero is displayed in the SpO

2 frame, or it is blank.

c. After about 10 to 20 seconds, the monitor displays saturation and heart

rate as specified by the tester. Verify that the values are within the following tolerances: Oxygen Saturation Range 79% to 83% Heart Rate Range 35 to 41 bpm

3- 4

Section 3: Performance Verification

d. The audible alarm sounds and both the SpO2% and HEART RATE

displays flash, indicating both parameters have violated the default alarm limits.

e. The heart rate tone is heard. (Heart rate tone source, found in the

Heart Rate Menu, should be set to “SpO2”.)

5. Press the ALARM SILENCE button on the front panel of the monitor. The audible alarm is temporarily silenced.

6. Verify the following: a. The audible alarm remains silenced. b. The “slashed bell” icon appears in each numeric frame on the display. c. The SpO d. The heart rate tone remains audible.

e. The audible alarm returns in approximately

60 seconds.

3.3.4.1.2 Heart Rate Tone Volume Control

Connect the SRC-2 pulse oximeter tester to the EC-8 sensor extension cable and connect the cable to the monitor. Set the SRC-2 as follows:

SWITCH

RATE 38 LIGHT LOW MODULATION LOW RCAL/MODE RCAL 63/LOCAL

1. Power on the monitor and verify that the SpO2 and heart rate values are correctly displayed. Press the ALARM SILENCE button on the front panel of the monitor to temporarily silence the audible alarm.

2. Verify that the heart rate tone source, found in the Heart Rate Menu, is set to “SpO

2”. Press the VOLUME button on the front panel of the monitor.

Within 3 seconds of having pressed the button, rotate the knob CW and verify that the beeping heart rate tone sound level increases.

2% and HEART RATE displays continue flashing.

POSITION

3. Rotate the knob CCW and verify that the beeping heart rate tone decreases until it is no longer audible. Rotate the knob CW to return the beep volume to a comfortable level. (Note that 3 seconds after the last button-press or rotation of the knob, function of the knob reverts to moving the highlight on the display screen.)

3-5

Section 3: Performance Verification

3.3.4.1.3 Dynamic Operating Range

The following test sequence verifies proper monitor operation over a range of input signals.

1. Connect the SRC-2 to the NPB-3900 (using an EC-8) and turn the NPB-3900 on.

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

3. Set the SRC-2 as indicated in Table 3-2. Verify that the NPB-3900 readings are within the indicated tolerances. Allow the monitor several seconds to stabilize the readings.

NOTE: A “*” indicates values that produce an alarm. Press the ALARM

SILENCE button to temporarily silence the audible alarm.

Table 3-2: SRC Settings and NBP-3900 Indications

RATE LIGHT MODULATION SpO2 Pulse Rate

38 HIGH2 LOW 79 - 83* 35 - 41* 112 HIGH1 HIGH 79 - 83* 109 - 115 201 LOW LOW 79 - 83* 195 - 207* 201 LOW HIGH 79 - 83* 195 - 207*

SRC-2 Settings NPB-3900 Indications

NOTE: For the pulse rate setting of 201 bpm, the pulse rate tolerance of 195 to

4. Turn the monitor off.

3.3.4.1.4 LED Excitation Test

This procedure uses normal system components to test circuit operation. A Nellcor Puritan Bennett Oxisensor II adhesive sensor, model D-25, is used to examine LED intensity control. The red LED is used to verify intensity modulation caused by the LED intensity control circuit.

1. Connect an EC-8 sensor extension cable to the monitor.

2. Connect a D-25 sensor to the sensor extension cable.

3. Press the ON/STANDBY button to turn the monitor on.

4. Leave the sensor open with the LED and photodetector visible.

5. After the monitor completes its normal power-up sequence, verify that the

207 bpm is greater than the ±3 bpm accuracy specification of the monitor, due to the performance characteristics of the SRC-2 tester.

sensor LED is brightly lit.

3- 6

6. Slowly move the sensor LED in proximity to the photodetector element of the sensor. Verify, as the LED approaches the optical sensor, that the LED intensity decreases.

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

8. Repeat step 6 and the intensity again decreases. This variation is an indication that the microprocessor is in proper control of LED intensity.

9. Turn the NPB-3900 off.

3.3.4.2 Operation with an ECG Simulator (NPB-3930, NPB-3940)

1. With the monitor off, connect the ECG leads to the appropriate jacks on

the ECG tester.

2. Connect the leads to the CE-10 ECG cable. Connect the CE-10 to the ECG

input port on the NPB-3900. Set the ECG tester as follows:

Heart rate: 30 bpm Amplitude: 1 millivolt Lead select: II

Section 3: Performance Verification

Normal sinus rhythm Adult mode

NOTE: The accuracy of the monitor’s ECG measurements is ±5 bpm. In the

procedure below, add the tolerance of the simulator to the acceptable range of readings.

3. Press the ON/STANDBY button to turn the monitor on. After the normal power-up sequence, verify the following monitor reactions:

a. After at least five heartbeats, the monitor displays a heart rate of

30 ±5 bpm.

b. The audible alarm sounds and the HEART RATE display flashes,

indicating the heart rate is below the default lower alarm limit.

4. Press the ALARM SILENCE button. Verify that the audible alarm is silenced.

5. Increase the heart rate setting on the ECG simulator to 240 bpm.

6. After at least five heartbeats, verify that the monitor displays a heart rate

of 240 ±5 bpm.

7. Verify that the audible alarm sounds and the HEART RATE display

flashes, indicating that the heart rate is above the default upper alarm limit.

8. Press the ALARM SILENCE button to silence the alarm.

3-7

Section 3: Performance Verification

9. Decrease the heart rate setting on the ECG simulator to 120 bpm.

10. After at least five heartbeats, verify that the monitor displays a heart rate

of 120 ±5 bpm.

11. Disconnect the LL lead from the ECG simulator. Verify that the “Leads

Off” alarm message appears, three dashes are displayed in the HEART RATE display, and a low priority audible alarm sounds.

12. Reconnect the LL lead to the ECG simulator. Verify that the “Leads Off”

alarm message no longer appears and that the audible alarm is silenced.

13. Repeat steps 11 and 12 for the LA and RA leads.

14. Turn the monitor off.

3.3.4.3 Verification of Pneumatic System (NPB-3900)

Tests in paragraphs 3.3.4.3.1 through 3.3.4.3.5 verify the functionality of the NPB-3900 pneumatic system. These tests were designed to use the Bio-Tek “BP Pump” noninvasive blood pressure simulator. The internal test volume of the Bio-Tek simulator is 250 cm

, which is used to calculated the inflation/deflation rate periods. The Bio-Tek simulator, or any equivalent NIBP simulator, is required to perform these tests.

The NPB-3900 must be placed in Diagnostic Mode, with the NIBP Test screen active for each of the NIBP tests. For a detailed explanation of the Diagnostic Mode, refer to Section 4, Power-up Defaults Menu and Diagnostic Mode.

Each of the tests described in paragraphs 3.3.4.3.1 through 3.3.4.3.5 must be performed to verify pneumatic system functionality. These tests can be performed individually (in any order) or sequentially. Prior to performing any of these tests, perform the following setup procedure. If these tests are performed in sequence, this procedure needs to be performed once prior to the first test.

1. Turn on the Bio-Tek simulator and press the MODE button to place the simulator in test mode. The simulator screen will indicate “Internal Cuff” and “Pressure Gauge”.

2. Connect the simulator hose to the NIBP connector on the NPB-3900.

3. Follow the procedure described in Section 4 to place the NPB-3900 in Diagnostic Mode with the NIBP Test screen active.

3.3.4.3.1 Pressure Transducer Accuracy

The pressure transducer accuracy test verifies the pressure accuracy of the NBP-3900 pressure transducer.

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Section 3: Performance Verification

1. Confirm that the Bio-Tek simulator is in test mode. The simulator should

display “Pressure Gauge”. Confirm that the simulator is set up for the internal cuff.

2. Confirm that the NIBP Test screen is active on the NPB-3900. Press, then release, the SPEAKER button on the NPB-3900 to verify that the valve is closed.

3. Press the CONTRAST button on the NPB-3900, then the ZERO button on the simulator, to perform an offset adjustment so that the simulator and NBP-3900 both display a pressure of 0 mmHg.

4. Press the SELECT button on the simulator until the simulator displays “Pressure Source Set Test Pressure”. Use the UP/DOWN buttons on the simulator to adjust for 250 mmHg.

5. Press the START PUMP button on the simulator. The simulator will begin to pressurize. The current pressure in mmHg is displayed on both the simulator and NPB-3900 displays.

6. Allow 15-20 seconds for the pressure to stabilize. The pressure displayed on the NPB-3900 and the simulator should be within 5 mmHg of one another to complete the test successfully.

7. Press the STOP PUMP button on the simulator to stop the test.

8. Press and hold the SPEAKER button until the NPB-3900 displays a

9. Additional NIBP tests may be performed at this time. If no further NIBP

3.3.4.3.2 Pneumatic Leakage

The pneumatic leakage test verifies the integrity of the pneumatic system. A timer/stopwatch is required for this test.

1. Ensure that the Bio-Tek simulator is in test mode. The simulator should

2. Ensure that the NIBP Test screen is active on the NPB-3900. Press, then

3. Press the CONTRAST button on the NPB-3900, then the ZERO button on

pressure of 0 mmHg.

tests are to be conducted, turn the NPB-3900 off. Normal monitoring operation will return the next time the monitor is turned on.

display “Pressure Gauge”. Confirm that the simulator is set up for the internal cuff.

release, the SPEAKER button on the NPB-3900 to verify that the valve is closed.

the simulator, to perform an offset adjustment so that the simulator and NBP-3900 both display a pressure of 0 mmHg.

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Section 3: Performance Verification

4. Press the NIBP button on the NPB-3900 to activate the pump. Hold the

5. Press and hold the SPEAKER button until the NPB-3900 displays a

6. Additional NIBP tests may be performed at this time. If no further NIBP

3.3.4.3.3 Inflation Rate

The inflation rate test verifies the inflation rate of the NPB-3900. A timer/stopwatch is required for this test.

1. Ensure that the Bio-Tek simulator is in test mode. The simulator should

button until the NPB-3900 displays a pressure of approximately 250 mmHg. Allow 15-20 seconds for the pressure to stabilize. Record the pressure displayed on the monitor, and initiate a 1-minute timer. After 1 minute, again record the pressure displayed. The test is successfully completed if the pressure has dropped by 6 mmHg, or less, during the 1-minute period.

pressure of 0 mmHg.

tests are to be conducted, turn the NPB-3900 off. Normal monitoring operation will return the next time the monitor is turned on.

display “Pressure Gauge”. Confirm that the simulator is set up for the internal cuff.

3.3.4.3.4 Deflation Rate

2. Ensure that the NIBP Test screen is active on the NPB-3900. Press, then release, the SPEAKER button on the NPB-3900 to verify that the valve is closed.

3. Press the CONTRAST button on the NPB-3900, then the ZERO button on

the simulator, to perform an offset adjustment so that the simulator and NBP-3900 both display a pressure of 0 mmHg.

4. Press the NIBP button on the NPB-3900 to activate the pump, and

simultaneously start the timer. Hold the NIBP button until the monitor displays a pressure of 280 mmHg. When a pressure of 280 mmHg is reached, stop the timer. The test is successfully completed if the inflation time is between 1 and 6 seconds.

5. Press and hold the SPEAKER button until the NPB-3900 displays a

pressure of 0 mmHg.

6. Additional NIBP tests may be performed at this time. If no further NIBP

tests are to be conducted, turn the NPB-3900 off. Normal monitoring operation will return the next time the monitor is turned on.

The deflation rate test verifies the deflation rate of the NPB-3900. A timer/stop watch is required for this test.

3- 10

1. Ensure that the Bio-Tek simulator is in test mode. The simulator should

display “Pressure Gauge”. Confirm that the simulator is set up for the internal cuff.

Section 3: Performance Verification

2. Ensure that the NIBP Test screen is active on the NPB-3900. Press, then

release, the SPEAKER button to verify that the valve is closed.

3. Press the CONTRAST button on the NPB-3900, then the ZERO button on

the simulator, to perform an offset adjustment so that the simulator and NBP-3900 both display a pressure of 0 mmHg.

4. Press the NIBP button on the NPB-3900 to activate the pump. Hold the button until the NPB-3900 displays a pressure of 280 mmHg. Initiate a 1-minute timer, and simultaneously press and hold the ALARM SILENCE button on the NPB-3900. This will cause the pneumatic system to deflate at

a rate of 3 mmHg/sec ±1.5 mmHg/sec. After 1 minute, record the pressure displayed on the NPB-3900. The test is successfully completed if the monitor displays a pressure reading of 10 mmHg to 190 mmHg.

5. Press and hold the SPEAKER button until the NPB-3900 displays a pressure of 0 mmHg.

6. Additional NIBP tests may be performed at this time. If no further NIBP tests are to be conducted, turn the NPB-3900 off. Normal monitoring operation will return the next time the monitor is turned on.

3.3.4.3.5 Over-pressure

The over-pressure test verifies the functionality of the over-pressure relief system of the NPB-3900.

1. Ensure that the Bio-Tek simulator is in test mode. The simulator should

display “Pressure Gauge”. Confirm that the simulator is set up for the internal cuff.

2. Ensure that the NIBP Test screen is active on the NPB-3900. Press, then release, the SPEAKER button on the NPB-3900 to verify that the valve is closed.

3. Press the CONTRAST button on the NPB-3900, then the ZERO button on

the simulator, to perform an offset adjustment so that the simulator and NBP-3900 both display a pressure of 0 mmHg.

4. Press the SELECT button on the simulator until the simulator displays

“Overpressure Test”. Press the START TEST button on the simulator. The simulator will pressurize the system until the monitor’s over-pressure relief system activates, including the warning display screen. The simulator will display the pressure value that caused the NPB-3900 over-pressure relief system to activate. The test is successfully completed if the simulator displays a pressure reading of 280 mmHg to 330 mmHg.

5. Press and hold the SPEAKER button to ensure that the NPB-3900 displays a

pressure of 0 mmHg.

6. Additional NIBP tests may be performed at this time. If no further NIBP

tests are to be conducted, turn the NPB-3900 off. Normal monitoring operation will return the next time the monitor is turned on.

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Section 3: Performance Verification

3.3.4.4 Operation with a Thermometer Calibration Key (Models 3920 and 3940)

1. Remove the probe from its holder.

2. Insert the calibration key in the temperature input port

3. Press the ON/STANDBY button to turn the monitor on. After the normal

power-up sequence, verify that the temperature reads 36.3 ±0.1 °C (or 97.3 ±0.2 °F).

4. Turn the monitor off.

3.3.4.5 General Operation

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

• 3.3.4.4.1 Operation with a Human Subject

• 3.3.4.4.2 Serial Interface Test

• 3.3.4.4.3 Printer Verification

3.3.4.5.1 Operation with a Human Subject

Patient monitoring involves connecting the monitor to a human subject for a qualitative test.

1. Connect an EC-8 sensor extension cable to the monitor. Connect a Nellcor Puritan Bennett Durasensor finger clip sensor, model DS-100A, to the sensor extension cable. Clip the DS-100A to the subject as described in the sensor directions for use.

on the NPB-3900.

2. Connect a CE-10 ECG cable to the NPB-3930 or NPB-3940. Connect ECG leads to the cable. Connect ECG electrodes to the leads. Apply ECG electrodes to the subject according to the lead’s and electrodes’ directions for use.

3. Connect an SHBP-10 blood pressure hose to the monitor. Apply the appropriate SCBP series blood pressure cuff to the subject according to the cuff directions for use.

4. Connect a blue-capped SureTemp oral thermometer probe to the NPB-3920 or NPB-3940. Place the probe in its holder in the module on the rear of the monitor.

5. Press the ON/STANDBY button to turn the monitor on and verify that the monitor is operating.

6. The monitor should stabilize on the subject’s physiological signals in about 15 to 30 seconds. Verify that the saturation and heart rate are reasonable for the subject.

7. Press the NIBP button on the front panel of the monitor. Verify that the blood pressure values are reasonable for the subject.

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8. Remove the temperature probe from its holder. Following the directions

3.3.4.5.2 Serial Interface Test

Perform the following procedure to test the serial port voltages. The test is

RS-232

qualitative and only verifies that the serial interface port is powered correctly, and that the “nurse call” signal is operational. The serial connector is a male DB-9 located on the monitor’s rear panel, identified with the RS-232 symbol.

1. Turn the monitor ON.

2. Set up the DMM with the function set to “VDC” at a range of 10 volts.

3. Connect the DMM negative lead to connector pin 5 (GND), or the shell of

4. Connect the DMM positive lead to the following pins, in turn, and verify

Section 3: Performance Verification

in the NPB-32900 operator’s manual, apply a new probe cover and take the subject’s temperature. Verify that the temperature measurement is reasonable for the subject.

the RS-232 connector.

the voltage values listed in Table 3-3. (Voltage for pin 9 is that listed for the “no alarm” condition.)

Table 3-3: Serial Interface Measurements

Measurement (V)

Pin Signal Min Typical Max

1 not used -0.4 0.0 0.4 2 RXD <<< -0.4 0.0 0.4 3 TXD >>> -5.0 -9.0 -15.0 4 DTR >>> -5.0 -9.0 -15.0 5 GND -0.4 0.0 0.4 6 DSR <<< -0.4 0.0 0.4 7 RTS >>> -5.0 -9.0 -15.0 8 CTS <<< -0.4 0.0 0.4 9 Alarm Out >>>

(no alarm) -5.0 -9.0 -15.0

9 Alarm Out >>>

(alarm underway) 5.0 9.0 15.0

5. Connect the Nellcor Puritan Bennett SRC-2 pulse oximeter tester to the monitor via the EC-8 sensor extension cable.

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Section 3: Performance Verification

6. Set the SRC-2 switches as follows:

SWITCH

RATE 38 LIGHT LOW MODULATION LOW RCAL/MODE RCAL 63/LOCAL

7. Verify that the monitor is responding to the SpO2 simulator signal and the

audible alarm is sounding. If desired, press the ALARM SILENCE button to temporarily silence the audible alarm.

8. Connect the DMM positive lead to pin 9 and verify the voltage value listed in Table 3-3. (Voltage for pin 9 is that listed for the “alarm underway”

condition.)

3.3.4.5.3 Printer Verification (For Optional Printer)

Printer verification consists of connecting the printer to the monitor and the monitor to a human subject for a qualitative test.

1. Connect the output of the appropriate power supply, PS-240V or PS-120V, to the labeled connector in the rear of the printer. When the printer’s external

15V - 1A

power supply is connected, the printer front-panel charging LED is lighted.

POSITION

RS-232

2. Connect the serial cable between the labeled connectors in the rear panels of the monitor and the printer.

3. The printer front-panel communication LED is lighted when the RS-232 communications link is completed.

4. Rotate the monitor knob to highlight the setup icon . Press the knob and ensure Communications Selection is (Printer).

5. Connect an EC-8 sensor extension cable to the monitor. Connect a Nellcor Puritan Bennett Durasensor oxygen transducer, model DS-100A, to the sensor extension cable. Attach the DS-100A to the subject as described in the sensor directions for use.

6. Press the ON/STANDBY button to turn the monitor on and verify that the monitor is operating.

7. The monitor should stabilize on the subject’s physiological signal in about 15 to 30 seconds. Verify that the saturation and heart rate is reasonable for the subject.

3- 14

8. Press the printer CONTINUOUS BUTTON. Verify that the printout contains vital signs across the top of the paper, and that aSpO marks, occupies the center portion of the paper. Press the CONTINUOUS BUTTON again to terminate printout.

9. Disconnect the sensor and shut off the monitor.

3.4 SAFETY TESTS

NPB-3900 safety tests consist of the following Leakage Currents elements, performed in accordance with IEC 601-1.

3.4.1 Protective Ground Continuity

NOTE: The NPB-3900 does not require an isolated Earth Ground terminal,

neither is one installed. No Protective Ground Continuity check is required.

3.4.2 Electrical Leakage

NPB-3900 leakage current tests consist of the following elements, performed in accordance with IEC 601-1, clause 19:

Section 3: Performance Verification

2 waveform, with grid

• Patient Leakage Current

• Patient Leakage Current, with Mains Voltage on the Applied Part

3.4.2.1 Patient Leakage Current

This test measures patient leakage current in accordance with IEC 601-1, clause 19, for Class II, type CF equipment. Patient leakage current in this test is measured from any individual patient connection to earth (power ground).

NOTE: This test requires a test cable for each patient connector. For example,

the ECG test cable consists of the ECG cable connector, with all the conductors shorted together, connected to a test lead from the electrical safety analyzer. Test cables for SpO in a similar manner.

1. Configure the electrical safety analyzer as recommended by the analyzer operating instructions.

2. Connect the appropriate external power supply input power cord to the analyzer as recommended by the analyzer operating instructions. Connect the external power supply output cord to the monitor.

3. Connect the ECG test cable to the ECG connector on the NPB-3930 /3940 and the appropriate input connector on the analyzer. Turn on the NPB-3930/3940.

2 and temperature can be configured

4. Perform the test as recommended by the analyzer operating instructions. Patient leakage current is measured under various conditions of the AC mains. For each condition, the measured leakage current must not exceed that indicated in Table 3-4.

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Section 3: Performance Verification

5. Repeat the test for the SpO2 and temperature patient connections, using the appropriate test cables.

Table 3-4: Current Test

Allowable Leakage

Test Condition

Current (milliamps)

Normal polarity 0.01 Normal polarity; Neutral (L2) open 0.05 Reverse polarity 0.01 Reverse polarity; Neutral (L2) open 0.05

3.4.1.3 Patient Leakage Current, with Mains Voltage on the Applied Part

This test measures patient leakage current in accordance with IEC 601-1, clause 19, for Class II, type CF equipment. In this test, 110% of mains voltage is applied between each patient connection and earth (power ground). Patient leakage current is then measured from any individual patient connection to earth.

NOTE: This test requires the same test cables for each patient connector as

described in section 3.4.1.2.

WARNING: AC mains voltage will be present on the applied part terminals during this test. Exercise caution to avoid electrical shock hazard.

1. Configure the electrical safety analyzer as recommended by the analyzer operating instructions.

2. Connect the monitor’s appropriate external power supply input power cord

to the analyzer as recommended by the analyzer operating instructions. Connect the external power supply output cord to the monitor.

3. Connect the ECG test cable to the ECG connector on the NPB-3930/3940 and the appropriate input connector on the analyzer. Turn on the NPB-3930/3940.

4. Perform the test as recommended by the analyzer operating instructions. Patient leakage current is measured with normal and reverse mains polarity. For each condition, the measured leakage current must not exceed that indicated in Table 3-5.

5. Repeat the test for the SpO2 and temperature patient connections, using the

appropriate test cables.

Table 3-5: Leakage Current

Allowable Leakage

Test Condition

Current (milliamps)

Normal polarity 0.05 Reverse polarity 0.05

3- 16

SECTION 4: POWER-UP DEFAULTS MENU AND DIAGNOSTIC MODE

4.1 Introduction

4.2 Power-up Defaults Menu

4.3 Restoring Factory Settings

4.4 Diagnostic Mode

4.1 INTRODUCTION

This section discusses use of the Power-up Defaults Menu to configure power-on default settings, and the Diagnostic Mode to obtain service-related information about the monitor.

4.2 POWER-UP DEFAULTS MENU

The purpose of the Power-up Defaults Menu (Table 4-1) is to allow the

authorized user to create a “power-up default” for each setting in the NPB-3900. Power-up defaults are the settings in effect each time the NPB-3900 is powered on. Once the Power-up Defaults Menu is entered, physiological monitoring is terminated. The screen layouts do NOT display any information associated with normal monitoring operation.

Use the following procedure to configure the power-up default settings for the NPB-3900 monitor.

1. While in normal monitoring mode, adjust each accessible setting on the monitor as desired, using the techniques described in the operator’s manual. Such settings include alarm limits, choice of display type for the graphic frame, and ECG lead select.

2. Use the knob to invoke the Set-up Menu (choose the screwdriver icon found along the bottom of the display).

3. Select the menu item “Enter Power-Up Defaults Menu”. Once selected, a pop-up box appears with the text “Enter 3-Digit Passcode”. Use the knob to enter the passcode, 2 1 5. This passcode is set at the factory and may not be changed.

4. The Power-up Defaults Menu is now present. The available menu items are

explained in the table that follows. Make changes to these menu items as desired.

Table 4-1: Power-Up Defaults Menu

MENU ITEM* CHOICES** EXPLANATION

Accept Current Settings?

“Yes”

“No”

If “Yes” is chosen, the current NPB-3900 settings become the power-up defaults.

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Section 4: Power-up Defaults Menu and Diagnostic Mode

Table 4-1: Power-Up Defaults Menu - (Continued)

MENU ITEM* CHOICES** EXPLANATION

Permanent Audible

“Make Available”

Alarm Silence

“Deny Access”

Alarm Suspend “Make Available”

“Deny Access”

Auto-Set Limits

“Make Available”

“Deny Access”

If “Make Available” is chosen, the caregiver may permanently silence the audible alarm for a particular parameter via the Alarm/Limits Menu. Some institutions may wish to prevent audible alarms from being permanently silenced. If so, “Deny Access” should be selected.

If “Make Available” is chosen, the caregiver may invoke the Alarm Suspend Mode by pressing and holding the Alarm Silence button for 2 seconds. Some institutions may wish to prevent Alarm Suspend from being invoked. If so, “Deny Access” should be selected.

If “Make Available” is chosen, the caregiver may invoke the Auto-Set Limits function via the Alarm/Limits Menu. Some institutions may wish to prevent Auto-Set Limits from being invoked. If so, “Deny Access” should be selected.

4-2

Section 4: Power-up Defaults Menu and Diagnostic Mode

Table 4-1: Power-Up Defaults Menu - (Continued)

MENU ITEM* CHOICES** EXPLANATION

Language

Enter Diagnostic Mode

“English”

“Français”

“Deutsch”

“Español”

“Italiano”

“Portugués”

“Japanese”

“Chinese”

“Russian”

“Yes”

“No”

The language selected will be used for all the text shown on the display; the selected language will be effective the next time the monitor is powered up.

If “Yes” is chosen, the Powerup Defaults Menu is exited and the Diagnostic Menu appears.

Done When selected, the Power-up

Defaults Menu is immediately exited and the user is instructed to power down the monitor.

* The choice in effect at the time the screen is accessed is shown

in parentheses following the menu item.

** Bold type indicates the choice when the factory-set default menu

appears. The highlighting is displayed in reverse video.

5. After making any desired changes to the menu items, choose the menu item “Accept current settings?”, select “YES”, then select “Done”.

6. Upon selecting “Done”, a Notice screen will appear, with the directions that the monitor must be powered off, and that any changes made to the power-up defaults will be in effect next time the unit is powered up.

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Section 4: Power-up Defaults Menu and Diagnostic Mode

Turn off the monitor at this time. Any changes made to the power-up defaults will be in effect the next time the monitor is turned on.

4.3 RESTORING FACTORY SETTINGS

CAUTION: In addition to restoring factory defaults, this procedure will also clear the contents of trend memory.

NOTICE

NOTE: Read this procedure completely before performing the first step.

The following technique can be used to restore the monitor’s power-up default settings which were originally established at the factory:

1. With the monitor powered off, simultaneously press the Volume and

2. While continuing to press the Volume and Contrast buttons, power-up the

3. Continue to keep the Volume and Contrast buttons depressed until the

4.4 DIAGNOSTIC MODE

The purpose of Diagnostic Mode is to allow factory, field-service, and hospital biomedical technicians access to a series of test and system-related information screens for the purpose of verifying NPB-3900 performance or troubleshooting problems.

To access the Diagnostic Mode, first invoke the Power-up Defaults Menu as described in section 4.2. Then, select the menu item, “Enter Diagnostic Mode”. Choose “Yes”. The Power-up Defaults Menu will be exited and the Diagnostic Menu will appear.

Contrast buttons on the front keypad.

monitor.

power-up diagnostic sequence is complete. When the normal monitoring screen appears, release the two buttons.

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Section 4: Power-up Defaults Menu and Diagnostic Mode

DIAGNOSTIC MENU

Error Codes System Information System A/D Values NIBP Test

Return

The Diagnostic Menu lists the test and system-related information screens. Selection of an item in the menu will invoke that test or information screen. The test and information screens that appear in the Diagnostic Menu are as follows:

• Error Codes

4.4.1 Error Codes

• System Information

• System A/D Values

• NIBP Test

• Return

This screen displays the 10 most recent error code types, logged by the NPB-3900. After 10 error code types have been logged, the oldest error code type will be deleted as new error code types are added. Adjacent to each error code will be an entry which is the number of occurrences of that error. This means that if there are many occurrences of one type of error code, that one error

code won’t “overwrite” the other 9 error codes. Next to the occurrence field is the time and date of the most recent occurrence of

the error code. Error codes may not be changed or reset in this screen. When in the Error Code screen, the “Return” item is always highlighted; a press of the knob will return the user to the Diagnostic Menu. Rotating the knob while in the Error Code screen will have no effect.

NOTE: Refer to Section 5.6.2 for more detail on error codes.

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Section 4: Power-up Defaults Menu and Diagnostic Mode

4.4.2 System Information

SYSTEM INFORMATION

Monitor On-Time 1563

Backlight On-Time 871

Battery Deep

Discharges

152

System Software

Version

2 Software Version Nellcor MP204/205

SpO

Return

V 2.01

V1.1.0.6 10/06/95

This screen displays several system-related items:

• Monitor On-time: Displays the number of hours, rounded to the nearest hour, that the Main PCB has been operational. This value may not be reset. (See Note 1.)

NOTE 1: Monitor on-time, backlight on-time, and battery deep

discharge values are stored in nonvolatile memory. When a new Main PCB is installed, this value will be set at zero.

• Backlight On-time: Displays the number of hours, rounded to the nearest hour, that the LCD Backlight has been operational. This value may be reset to zero, for instance, when a technician changes the backlight or installs a new LCD. (See Note 1.)

• Battery Deep Discharges: Displays the number of deep-discharge cycles seen by the battery. The monitor records a deep discharge cycle when the

battery voltage reaches 5.6 V, the voltage at which a “Low Battery” alarm is issued. This value may be reset to zero, for instance, when a technician installs a new battery. (See Note 1.)

4-6

• System software version: Displays the revision level of the system software. This revision level is also momentarily shown on the LCD as part of the Copyright screen. This value may not be changed by the user.

• SpO

2 software version: Displays the revision level of the software of the

SpO

2 EEPROM module. This value may not be changed by the user.

When in the System Information screen, the knob may be rotated to select any of the “changeable” items. If one of those items is selected, a press of the knob will cause a pop-up menu to appear. The first item in the pop-up will read “Make no change”; the second item in the pop-up will read “Reset to zero”. Exiting the screen is accomplished in the normal manner, by selecting “Return”.

4.4.3 System A/D Values

Section 4: Power-up Defaults Menu and Diagnostic Mode

SYSTEM A/D VALUES

1. 1.478 12. 1.478

2. 0.235 13. 0.235

3. 3.652 14. 3.652

4. 0.782 15. 0.782

5. 4.012 16. 4.012

6. 0.045 17. 0.045

7. 2.149 18. 2.149

8. 1.025 19. 1.025

9. 0.478 20. 0.478

10. 1.369 21.

11. 0.702

2 S1 S018 SpO2 S2 S0010

SpO

Return

This screen displays the current value of each analog-to-digital (A/D) channel, in volts. Some of the channels are for AC-coupled signals (such as ECG input), so the numbers on the screen will be constantly changing when an input signal is present. These AC-coupled values indicate whether basic functionality of the channel is present, but no significance can be derived from the values of the numbers displayed. However, other A/D channels read DC voltages, (for example, power supply voltages and battery voltage) so those voltage values provide useful diagnostic information.

The Primary and Secondary Status messages from the SpO

2 module will be

displayed and updated at the rate of about once per second. Presence of the correct SpO the SpO

2 message indicates that, at a basic level, communication between

2 module and the main monitor processor is working correctly. None of

the displayed values may be changed or reset in this screen. When in the System

A/D screen, the “Return” item is always highlighted; a press of the knob will return the user to the Diagnostic Menu. Rotating the knob while in the System A/D screen will have no effect. The A/D channel designators are shown in Table 4-2.

Table 4-2: A/D Channel Desi

A/D CHANNEL DESIGNATO

1. ECG 12. (BATTERY VOLTAGE) X 0.5

A/D CHANNEL DESIGNATO

nator

2. RWAVE 13. TEMP PROBE <=0=ORAL, 1=RECTAL,2=CAL KEY, >=3 NONE)

3. PACEMAKER 14. +3.3VDC POWER SUPPLY

4. TEMP 1(93° TO 112°) 15. (NIBP VOLTAGE REF) X 0.8

4-7

Section 4: Power-up Defaults Menu and Diagnostic Mode

Table 4-2: A/D Channel Designators - (Continued)

5. PRESSURE XDUCER 1 16. GROUND REFERENCE

6. PRESSURE XDUCER 2 17. (+5 VDC POWER SUPPLY) X 0.8

7. NIBP OSCILLATORY 18. ADC MID-SCALE VALUE

8. ECG LEADS OFF 19. ADC FULL-SCALE VALUE

9. TEMP 2(59° TO 93°) 20. ADC ZERO-SCALE VALUE

10. ISOLATED VOLTAGE REF 21. (NOT USED)

11. ISOLATED VOLTAGE ZERO

SpO2 S1 S018 SpO2 S2 S010

4.4.4 NIPB Test

WARNING: Never apply an attached blood pressure cuff to a patient while the monitor is in Diagnostic Mode. Injury could result.

NIBP TEST

Pressure

179 (mmHg) Valve: OPEN

Press “NIBP” to activate pump; release to stop pump.

Press “Volume” to open valve; release to close valve.

Press “Alarm Silence” to open proportional valve and deflate at 3 mmHg/s; release to close valve.

Press “Contrast” to perform offset adjust.

Return

4-8

An NIBP Test screen is provided to facilitate troubleshooting problems and perform verification testing for the NIBP subsystem. Typically, when these tests are performed, the pneumatic system is connected to an external pressure-

Section 4: Power-up Defaults Menu and Diagnostic Mode

reading device and a closed reference volume. The NIBP Test screen provides a real-time numeric display of the pressure in the pneumatic system, means for controlling the pump and valve, and a display indicating whether the valve is open or closed.

The NIBP Test screen elements are described below.

• Pressure Display: The real-time value of the system pneumatic pressure is

displayed in mmHg. The value is updated at the rate of approximately two times per second.

• Valve Display: A display indicates whether the valve is open or closed.

• Activate pump: While the NIBP button is pressed, the pump will run. If

system pressure reaches the hardware over-pressure protection point (280 to 330 mmHg), the safety valve will open and the pump will be disabled, until the pressure falls below the safety threshold.

• Deflate: For as long as the Alarm Silence button is pressed, the valve will

open and bleed off pressure at the rate of 3 ±1.5 mmHg/sec. It is useful to

control the bleed rate to 3 mmHg/sec to facilitate certain AAMI SP10 tests. Any time the bleed rate falls below 3 mmHg/sec, the valve will open and remain at maximum as long as the button is pressed.

• Open Valve: While the Volume button is pressed, the valve opens and

remains at maximum as long as the button is pressed.

• Offset Adjust: A momentary press of the Contrast button will invoke the

“zero calibration” routine that is performed immediately prior to each blood pressure measurement. This routine looks at the pressure in the system, and if the pressure is non-zero, an offset is applied which causes the system pressure to be displayed as “zero”.

When in the NIBP Test screen, the “Return” item is always highlighted; a press of the knob will return the user to the Diagnostic Menu. Rotating the knob while in the NIBP Test screen will have no effect.

4-9

SECTION 5: TROUBLESHOOTING

5.1 Introduction

5.2 How to Use this Section

5.3 Who Should Perform Repairs

5.4 Replacement Level Supported

5.5 Obtaining Replacement Parts

5.6 Troubleshooting Guide

5.7 Troubleshooting the Oximetry Function

5.8 P-3900 Troubleshooting Guide

5.1 INTRODUCTION

This section explains how to troubleshoot the NPB-3900 if problems arise. Tables are 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, and Section 7, Spare Parts. To remove and replace a part you suspect is defective, follow the instructions in Section 6, Disassembly Guide. The circuit analysis section in the Technical Supplement offers information on how the monitor functions.

5.3 WHO SHOULD PERFORM REPAIRS

Only qualified service personnel should open the monitor housing, remove and replace components, or make adjustments. If your medical facility does not have qualified service personnel, contact Nellcor Puritan Bennett Technical Services or your local Nellcor Puritan Bennett representative.

5.4 REPLACEMENT LEVEL SUPPORTED

The replacement level supported for this product is to the printed circuit board (PCB) and major subassembly or component level. Once you isolate a suspected PCB, follow the procedures in Section 6, Disassembly Guide, to replace the PCB with a known good PCB. Check to see if the trouble symptom disappears and that the monitor passes all performance tests. If the trouble symptom persists, swap back the replacement PCB with the suspected malfunctioning PCB (the original PCB that was installed in the monitor before you started troubleshooting) and continue troubleshooting as directed in this section.

5-1

Section 5: Troubleshooting

5.5 OBTAINING REPLACEMENT PARTS

Nellcor Puritan Bennett Technical Services provides technical assistance information and replacement parts. To obtain replacement parts, contact Nellcor Puritan Bennett or your local Nellcor Puritan Bennett representative. Refer to parts by the part names and part numbers listed in Section 7, Spare Parts.

5.6 TROUBLESHOOTING GUIDE

Problems with the NPB-3900 are separated into the categories indicated in Table 5-1. Refer to the paragraph indicated for further troubleshooting instructions.

NOTE: Taking the recommended actions discussed in this section will correct

the majority of problems you may encounter. However, problems not covered here can be resolved by calling Nellcor Puritan Bennett Technical Services or your local representative.

Problem Area Refer to

Table 5-1: Problem Categories

Paragraph

1. Power

5.6.1

• No power-up

• Fails power-on self-test

• Powers down without apparent cause

2. Error Messages 5.6.2

3. Buttons/Knob

5.6.3

• Monitor does not respond properly to buttons

4. Display/Audible Tones

5.6.4

• Display does not respond properly

• Tones do not sound properly

5. Operational Performance

5.6.5

• Displays appear to be operational, but monitor shows no readings

• Suspect readings

• Printer not responding

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

5-2

5.6.1 Power

Section 5: Troubleshooting

Table 5-2 lists recommended actions to address power problems.

Table 5-2: Power Problems

Condition Recommended Action

1. With external power supply connected, the green EXTERNAL POWER indicator

on the front panel is not lit.

1. Ensure that the external power supply input (PS120V or PS-240V) is plugged into an operational AC outlet of the appropriate voltage and frequency.

2. Disconnect the power supply output cable from the monitor. Measure the voltage across pins 1 and 4 of output connector. If the open circuit voltage does

not measure approximately 17 ±3 V~ RMS, replace the power supply.

3. If the battery is severely discharged or shorted, the EXTERNAL POWER indicator will not light. Connect the external power supply to an AC outlet and to the monitor. Allow the battery to charge for 30 minutes. If the EXTERNAL POWER indicator still does not light, replace the battery.

4. Inside the monitor, check the ribbon cable and ensure that it is properly connected to the main PCB.

5. The EXTERNAL POWER indicator is embedded in the keypad. Ensure that the keypad is plugged into Main PCB. If the connection is good, replace the keypad.

2.The NPB-3900 fails to power-up when the ON/STANDBY button is pressed ... with the monitor connected to external power supply

6. If the problem persists, replace main PCB.

1. Connect the appropriate external power supply (PS120V or PS-240V) to the monitor. Ensure that the external power supply input is plugged into an operational AC outlet of the appropriate voltage and frequency. Ensure that the green EXTERNAL POWER indicator is lit. If the indicator is not lit, follow the steps described in Condition 1, above.

2. Ensure that the keypad is plugged into Main PCB. If the connection is good, replace keypad.

3. If the problem persists, replace the main PCB.

5-3

Section 5: Troubleshooting

Table 5-2: Power Problems - (Continued)

Condition Recommended Action

3. The NPB-3900 fails to power-up when the ON/STANDBY button is pressed with the monitor not connected to external power supply.

4. The NPB-3900 turns on, then shuts off and sounds an alarm and no error code is displayed.

1. First, follow the steps described in Condition 2, above, to ensure that the monitor will operate when connected to an external power supply.

2. Check fuse F301 located on the Main PCB, near the battery cable connector. Replace fuse if necessary.

3. Recharge the battery as directed in paragraph 3.3.1. If the battery fails to hold a charge, replace the battery.

4. If the problem persists, replace the main PCB.

1. Press the alarm silence button to terminate the audible alarm. Ensure that the external power supply is connected and the green EXTERNAL POWER indicator is lit. If the monitor operates successfully, the battery may be discharged, or the battery fuse may be blown.

2. Recharge the battery as directed in paragraph 3.3.1. If the battery fails to hold a charge, replace the battery.

3. Check fuse F301 located on the Main PCB, near the battery cable connector. Replace the fuse if necessary.

5.6.2 Error Codes

4. If problem persists, replace the main PCB.

When the NPB-3900 detects an error condition, the monitor shows an error code on the display screen. If such an error occurs during monitoring operation, an audible alarm tone will sound, as well. Press the ALARM SILENCE button to terminate the audible alarm tone.

When an error code appears on the display, a number in hexadecimal representation indicates the nature of the error. Additionally, Diagnostic Mode may be used to gain access to an error code record, stored in nonvolatile memory, of the last 10 error codes encountered by the monitor. See Section 4 for further details on Diagnostic Mode.

Each error code corresponds to a particular problem in the monitor. Recommended actions to take when an error code is encountered are listed in the sections that follow.

As an aid to troubleshooting, the NPB-3900 provides the capability for technicians to print out a copy of the error log.

5-4

Generating an Error Log printout

1. Connect a P-3900 printer to the monitor, and its power supply to an

appropriate source. Refer to the operator’s manual.

2. Use the Setup button and displayed menu to verify that the Printer mode is the selected option for the Communications Selection item. (It is the factoryset default value.)

3. Turn monitor power OFF.

4. Simultaneously press the contrast button and the On/Standby button to power up the monitor. Keep the contrast button depressed until the monitoring screen appears (after 10 seconds). The error code printout is generated automatically.

If error codes listed on the Diagnostic Mode error code screen or on the error log printout are in the range from 1 to 65 (hex), a hardware problem has been detected. Refer to Table 5-3, Serviceable Hardware Codes for additional information on these codes.

5.6.2.1 Serviceable Hardware Error Codes

Section 5: Troubleshooting

In Table 5-3 are error codes that correspond to hardware problems, and the recommended actions to take should such an error be encountered.

Table 5-3: Serviceable Hardware Error Codes

Hex

Explanation Recommended Action

Code

1 Improper shutdown. 1. Cycle power.

2. If this error persists, return monitor for service.

2 NIBP Sensor Error. The

two pressure

1. Check for blocked hoses in the pneumatic system.

transducers do not agree.

NIBP Pressure Violation Error. The pressure on the cuff could not be removed by normal means. A fault has been detected in the NIBP system that could not be handled by releasing pressure by normal means.

2. Replace Main PCB.

1. Cycle power.

2. Check for blocked hoses in the pneumatic system.

3. Replace Main PCB.

5-5

Section 5: Troubleshooting

Table 5-3: Serviceable Hardware Error Codes - (Continued)

Hex

Explanation Recommended Action

Code

4 The measured value of

the 3.3-volt power supply is low.

5 The measured value of

the 3.3-volt power supply is high.

7 The measured value of

the 12-volt power supply is high.

8 The measured value of

the 5-volt power supply is low.

9 The measured value of

the 5-volt power supply is high.

A The measured value of

the isolated reference supply on the front end is low.

1. Check power supply.

2. Replace Main PCB.

1. Check power supply.

2. Replace Main PCB.

1. Check power supply.

2. Replace Main PCB.

1. Check power supply.

2. Replace Main PCB.

1. Check power supply.

2. Replace Main PCB.

1. Check power supply.

2. Replace Main PCB.

5-6

B The measured value of

the isolated reference supply on the front end is high.

D A checksum error is

detected on the NIBP region of Flash Memory.

1. Check power supply.

2. Replace Main PCB.

Cycle power. If error persists, replace Main PCB.

Section 5: Troubleshooting

Table 5-3: Serviceable Hardware Error Codes - (Continued)

Hex

Explanation Recommended Action

Code

E A checksum error is

detected on the powerup settings region of Flash memory.

64 The SpO2 module is

sending an error messages to the host CPU.

65 The SpO2 module is

not communicating with the host CPU.

1. Turn Power Off

2. Turn power back on while

pressing both the Contrast and Volume buttons. See Section 4.3.

3. All user selections must be

restored.

4. If error persists, replace Main

PCB.

Cycle power. If problem persists, replace Main PCB.

Cycle power. See Section 5.7.

If problem persists, replace main

PCB.

5.6.2.2 Other Error Codes

If an error code occurs that is not listed in Section 5.6.2.1, take the following actions:

1. Turn the monitor off, then on again.

2. If the error code still appears, take the monitor out of service and contact Nellcor Puritan Bennett Technical Services or your local Nellcor Puritan Bennett representative for advice on remedial action.

3. If the monitor powers up and the error code does not recur, enter the Diagnostic Mode and invoke the Error Code screen. Examine the record of the last 10 error codes and determine if the same error code occurred previously.

4. If the Error Code screen indicates that the same error has occurred previously, take the monitor out of service and contact Nellcor Puritan Bennett Technical Services or your local Nellcor Puritan Bennett representative for advice on remedial action.

5. If the Error Code screen indicates no previous occurrences of this error, the monitor may be returned to service.

5-7

Section 5: Troubleshooting

As a reference, Table 5-4 lists the general categories for other error codes. The error code categories are shown only in hexadecimal format.

Table 5-4: Error Code Categories

Code (hex) Explanation

500xxxx internal user interface error 501xxxx remote serial port error 502xxxx date and time error 503xxxx NIBP error 504xxxx front end error 505xxxx alarm error 506xxxx audio error 507xxxx recorder error 508xxxx trend error

5.6.3 Buttons/Knobs

509xxxx flash memory data error

50axxxx SpO2 error

50bxxxx ECG error

50cxxxx power-down task error

50dxxxx on-board diagnostic error

50exxxx power monitor error

50fxxxx temperature measurement error 510xxxx internal user interface error 511xxxx error handling error 513xxxx serial driver error 514xxxx system software errors

Table 5-5 lists recommended actions to address problems with the knob and front-panel buttons.

5-8

Section 5: Troubleshooting

Table 5-5: Buttons/Knob Problems

Condition Recommended Action

1. The NPB-3900 fails to power-up when the ON/STANDBY button is pressed.

2. The NPB-3900 powers-up, but some/one of the other buttons does not respond.

3. When the knob is rotated, no highlight appears on the display screen, and/or the monitor does not respond to knob presses.

5.6.4 Display/Audible Tones

Table 5-6 lists recommended actions to address problems with the display and audible tones.

Take steps as noted in section 5.6.1.

1. Ensure that the keypad is plugged into the Main PCB. If the connection is good, change the keypad.

2. If the problem persists, change the Main PCB.

1. Ensure that the encoder cable is plugged into the Main PCB. If the connection is good, change the encoder.

2. If the problem persists, replace the Main PCB.

Table 5-6: Display/Audible Tones Problems

Condition Recommended Action

1. System powers-up

and…

• LCD screen is totally black or white.

Or,

• LCD screen is illuminated, but no data is visible.

Or,

• LCD screen has data, but is not illuminated.

1. Adjust the LCD screen contrast by pressing the contrast button momentarily, then turning the knob four revolutions in each direction. Turning the knob clockwise should brighten the screen; turning the knob counterclockwise should darken the screen.

2. Ensure that the backlight cable is connected to the main PCB.

3. Ensure that the LCD connector is properly connected to the main PCB.

4. If problem persists, replace main PCB.

5. If problem persists, replace LCD assembly.

5-9

Section 5: Troubleshooting

Table 5-6: Display/Audible Tones Problems - Continued

Condition Recommended Action

2. NPB-3900 responds to button press, but key press tone fails to sound.

3. Audible alarm does not sound.

1. Ensure that the speaker cable is connected to the main PCB.

2. If the problem persists, replace the speaker assembly.

3. If the problem persists, replace the Main PCB.

1. Verify alarm volume setting in the Alarm/Limits menu, and test operation of the alarm tone by pressing the volume button while the alarm volume setting is displayed.

2. Ensure that the speaker cable is connected to the Main PCB.

3. If the problem persists, replace the speaker assembly.

4. If the problem persists, replace the Main PCB.

5.6.5 Operational Performance

Table 5-7 lists recommended actions to address problems related to operational performance.

Condition Recommended Action

1. The monitor appears to be operational, but the physiological values are suspect or nonexistent.

Table 5-7: Operational Performance Problems

1. Replace each patient cable (or hose) with a known-good cable.

2. Ensure that the Patient Connector PCB is

properly connected to the main PCB. Ensure that the hoses in the pneumatic system are properly connected, and that the NIBP pump motor is connected to the Rear Connector PCB.

3. If the problem persists, replace the Patient

Connector PCB.

4. If the problem persists, replace Main PCB.

5-10

5.7 TROUBLESHOOTING THE OXIMETRY FUNCTION

5.7.1 Introduction

The oximetry functional hardware is embedded on the NBP-3900 main printed

circuit board. (Note that “oximetry” and “SpO manual.) This section assumes that the NBP-3900 has been thoroughly checked and that all indications point to an oximetry malfunction.

5.7.2 Fault Evaluation

Table 5-8 provides fault indications and possible solutions.

Table 5-8: Fault Evaluation

Indication Action

Section 5: Troubleshooting

2” are used interchangeably in this

NPB-3900 gives error code 64 or 65, indicating communications problem w/ SpO2 module.

NPB-3900 gives lowpriority alarm, “SpO2 Cable/Sensor Disconnect”

NPB-3900 gives status message “SpO

2 Pulse

Search”

Check 5-volt digital power supply. Check processor clock Y1. Check TXD buffer U5.

Sensor may be disconnected or damaged. Patient Connector PCB may be defective.

The sensor may be improperly applied to the patient or may be damaged. Try another sensor. Try an SRC-2 pulse oximeter tester to check oximetry functionality.

Cover the sensor to eliminate the possibility of ambient light interference.

The patient’s perfusion may be too poor for the instrument to detect an acceptable pulse. Try using C-Lock ECG synchronization, if available.

Check + and –5 volt analog power supplies.

Waveform output incorrect

Check for proper LED drive function. Check the signal path from the

photodetector input to the A:D converter. Sensor or interconnecting cables may be

damaged. Noise may be present.

5-11

Section 5: Troubleshooting

5.7.3 Waveforms

Figures 5-1 through 5-5 are typical waveforms as measured at various test points (labeled TP) on the oximetry module. These waveforms are valuable in tracing signals and locating faults. The user must use a Nellcor Puritan Bennett SRC-2

pulse oximeter tester. Contact Nellcor Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative if you have difficulty replicating these waveform examples.

5.7.3.1 Preamplifier and PGA Outputs Waveform

5.7.3.1.1 SRC-2 Settings

Rate: Light: Modulation: RCAL/MODE:

112 High2 LOW RCAL 63/LOCAL

5.7.3.1.2 Trace Descriptions

CHNL 2 : CHNL 1 : CHNL 3 :

5-12

Figure 5-1: Preamplifier and PGA Outputs

TP3 Primary Input Preamplifier TP4 Secondary Input Preamplifier TP9 PGA output

5.7.3.2 Filter Outputs and ADC Input Waveform

5.7.3.2.1 SRC-2 Settings

Section 5: Troubleshooting

Rate: Light: Modulation: RCAL/MODE:

112 High2 HIGH RCAL 63/LOCAL

5.7.3.2.2 Trace Descriptions

CHNL 3 : CHNL 1 : CHNL 2 :

Figure 5-2: Filter Outputs and ADC Input

TP5 ADC Input TP6 Red Filter Output TP2 IR Filter Output

5-13

Section 5: Troubleshooting

5.7.3.3 SpO2 Module with an SRC-2 Waveform

5.7.3.3.1 SRC-2 Settings

Rate: Light: Modulation: RCAL/MODE:

112 High2 HIGH RCAL 63/LOCAL

5.7.3.3.2 Trace Descriptions

Figure 5-3: SpO2 Module with an SRC-2

CHNL 2 : CHNL 1 :

TP6 Red Filter Output TP2 IR Filter Output

5-14

Section 5: Troubleshooting

5.7.3.4 SpO2 Module with an SCR-2 LED Drive Current Test at TP7 Waveform

5.7.3.4.1 SRC-2 Settings

Rate: Light: Modulation: RCAL/MODE:

112 High2 HIGH RCAL 63/LOCAL

Figure 5-4: SpO2 Module with SRC-2 Drive Current Test at TP7

5-15

Section 5: Troubleshooting

5.7.3.5 SpO2 Module with SCR-2 Waveform

5.7.3.5.1 SCR-2 Settings

Rate: Light: Modulation: RCAL/MODE:

112 High2 HIGH RCAL 63/LOCAL

5.7.3.5.2 Trace Description

Serial Port TXD Signal, U4 Pin 25

Figure 5-5: SpO2 Module with SRC-2

5-16

5.8 P-3900 TROUBLESHOOTING GUIDE

Table 5-9 lists recommended actions to address printer problems.

Table 5-9: P-3900 Troubleshooting Guide

Condition Recommended Action

Section 5: Troubleshooting

1. With external power supply connected, the green EXTERNAL POWER indicator on the front panel is not lit.

1. Ensure that the external power supply input (PS120V or PS-240V) is plugged into an operational AC outlet of the appropriate voltage and frequency.

2. Disconnect the power supply output cable from the printer. Measure the voltage across pins 1 and 4 of output connector. If the open circuit voltage does

not measure approximately 17 ±3 V~ RMS, replace the power supply.

3. If the battery is severely discharged, the EXTERNAL POWER indicator may not light. Connect the external power supply to an AC outlet and to the printer. Allow the battery to charge for 30 minutes.

4. Open the printer enclosure and ensure that all connectors are properly seated.

5. If the problem persists, replace the battery.

6. If the problem persists, replace the Printer PCB.

7. The EXTERNAL POWER indicator is embedded in the Front Panel. If the problem persists, replace the Front Panel.

5-17

Section 5: Troubleshooting

Table 5-9: P-3900 Troubleshooting Guide - (Continued)

Condition Recommended Action

2. No printout occurs when control buttons are pressed on P-3900 front panel.

1. Open the printer paper door and verify that the printer is properly loaded with paper.

2. Ensure that the green LINKED indicator is lit. If not, first determine that the serial cable is properly connected between printer and NPB-3900 monitor. Next, on the NPB-3900 monitor, check the “Set-up

Menu” and verify that “Communications Selection” is set to “Printer”. If the indicator is still not lit, replace the serial cable with a known-good cable.

3. Connect a known-good external power supply to an AC outlet and to the printer. If both the green front panel indicators are lit (EXTERNAL POWER and LINKED), then the printer should operate. If the EXTERNAL POWER indicator still fails to light, follow the steps outlined in Condition 1.

4. Open the printer enclosure and ensure that all connectors are properly seated.

5. If the problem persists, replace the Printer PCB.

3. Printer paper will advance, but paper remains blank when printing should be present.

6. If the problem persists, replace the printer mechanism.

1. Open the printer door and verify that paper is oriented correctly. The PAPER icon adjacent to the door release button illustrates proper orientation of the paper roll. (The paper is thermally sensitive on one side only; if the roll is installed backwards, printing will not occur.)

2. If the problem persists, replace the printer mechanism.

5-18

SECTION 6: DISASSEMBLY GUIDE

6.1 Introduction

6.2 How to Use this Section

6.3 Disassembly Flow Charts

6.4 Closed Case Disassembly

6.5 Front Case Disassembly

6.6 Rear Case Disassembly

6.7 Main PCB Disassembly

6.1 INTRODUCTION

WARNING: Performance Verification. Do not place the NPB-3900 into operation after repair or maintenance has been performed, until all Performance Tests and Safety Tests listed in Section 3 of this service manual have been performed. Failure to perform all tests could result in erroneous monitor readings.

The NPB-3900 can be disassembled down to all major component parts, including:

• PCBs

• battery

• cables

• function buttons

• chassis enclosures The following tools are required:

• medium, Phillips-head screwdriver

• needle-nose pliers

• 9/16-inch socket (for knob encoder) 3/16 inch socket (for rear-panel RS-232 connector).

WARNING: Before attempting to open or disassemble the NPB-3900, disconnect the power supply from the NPB-3900.

WARNING: High voltage is generated by the LCD backlight driver. Exercise caution when operating monitor with covers open.

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

6-1

Section 6: Disassembly Guide

Caution: If internal battery cable has been disconnected, pay particular attention to polarity of the cable before reattaching. If battery cable polarity is reversed, it is likely that circuit damage will occur.

NOTE: Some spare parts have a business reply card attached. When you receive

these spare parts, please fill out and return the card.

6.2 HOW TO USE THIS SECTION

The step-by-step procedures that are used to access replaceable parts of the NPB-3900 are illustrated in the Disassembly Flow Charts in paragraphs 6.3, Figures 6-1, 6-2, 6-3 and 6-4. As indicated in the flow charts, the monitor consists of two main assemblies, the Front Case Assembly, and Rear Case Assembly. The Main PCB assembly is separable from the front case assembly.

The circles on the flow charts contain reference designators that point to specific steps in the Disassembly Procedures. The Disassembly Procedures, paragraphs

6.4, 6.5, and 6.6 contain detailed disassembly instructions, accompanied by

illustrations. The rectangular boxes on the flow charts represent the various spare components

or subassemblies. The digits appearing in these boxes are their respective part numbers. Section 7, Spare Parts, contains a complete listing of the available spare parts.

The Disassembly Flow Charts are organized so that minimum disassembly is required to remove and replace defective items.

Further important disassembly information may be found in the diagrams in the Appendix.

6.3 DISASSEMBLY FLOW CHARTS

The charts have been developed for use with all models of the NPB-3900 family. Therefore, some disassembly procedures will not be applicable to model configurations of less than the full complement of functions. In most cases, the relevant subassemblies will not have been installed, and it will be apparent that the pertinent procedures will not apply. However, when a temperature-measuring function is involved, a different hardware configuration of the rear-case assembly is shown in the flow chart.

The charts have been developed to provide service personnel with the most direct route to a replaceable item after a troubleshooting analysis has led to a probable cause, traced to hardware sources.

6-2

A1 A3

Battery

)

048936

048939

048938

Switch

048992

Batter

Cover

048935

Batter

048987

Batter

Pads

048937

Temp

Model

NPB-3900

Cover(Temp

Temp

Housin

Temp

Grommet

Probe

Section 6: Disassembly Guide

SpO2 Hood

048942

Rear Cover

Gasket

048991

Rear Case

Assembl

Fig. 6-3

Batter

Cable

048940

Front Case

Assembl

Fig. 6-2

Main PCB

Assembl

Fig. 6-4

Figure 6-1: Top Level Disassembly Flow Chart

6-3

Section 6: Disassembly Guide

Display

Shield

048944

Front Case

Assembl

Spring

Retainer

048990

Speaker

048948

LCD Display 048943

Display

Window

048945

Front

Cover

048947

Encoder

291186

Knob

044727

Keypad

048946

Figure 6-2: Front Case Disassembly Flow Chart

6-4

Rear Conn.

PCB

048956

Section 6: Disassembly Guide

Rear Case

Assembl

Pump

Clamp

048989

NIBP

Pump

048949

Handle

048941

Foot

Cushion

048950

Rear

Cover

048951

Figure 6-3: Rear Case Disassembly Flow Chart

6-5

Section 6: Disassembly Guide

NIBP

Pneumatics

048957

Main PCB

Assembl

Main

PCB

048952…54

Fuse F301

048970

Figure 6-4: Main Board Disassembly Flow Chart

Patient

Conn. PCB

048962…65

Connector

Panel

048966…69

6-6

6.4 CLOSED CASE DISASSEMBLY

The paragraphs in this section describe and photographically illustrate procedures for disassembling the NPB-3900 to enable removal and replacement of suspected defective assemblies/components.

The sequence supports the guides in the previous paragraphs of this section.

The illustrations may also contain juxtaposed photographs of the relevant spares.

Section 6: Disassembly Guide

See Figure 6-1. If there is no apparent reason to replace the battery, begin with procedure B1. If the battery needs replacement, and there is no temperature module (Models 3910 and 3930), begin with procedure A1.

6-7

Section 6: Disassembly Guide

Step A1

Procedure

To remove the Battery from Models 3910 and 3930, when a Temperature module is not installed:

Use a Phillips head screwdriver to remove the two screws fastening the battery cover to the rear case.

Remove the battery cover.

Illustration

Battery Pad

6-8

Section 6: Disassembly Guide

Step A2

Procedure

Disconnect the spade terminal connectors from the battery terminals.

Caution: Pay particular attention to polarity of the battery cable before reattaching. If battery cable polarity is reversed, it is likely that circuit damage will occur.

Remove battery. As required, remove the battery cushions on the inside of the battery

compartment and battery cover.

Illustration

Foot Cushions

Battery Cover

Step A3

Procedure

To remove the battery from Models 3920 and 3940, when a temperature module is installed:

Illustration

Temp

Rear View

Models

3920, 3940

Module

6-9

Section 6: Disassembly Guide

Step A3

Procedure

Use a Phillips head screwdriver to remove the two screws fastening the temperature module housing to the rear case assembly.

Illustration

Step A3

Procedure

Remove the temperature module housing and the battery cover.

Illustration

6-10

Section 6: Disassembly Guide

Procedure

The probe sensor contact switch is mounted on the outer side of the battery cover.

As required, disconnect the leads from the probe switch to the rear panel connector. Remove the switch.

Illustration

Temperature Probe

Probe

Sensor

Switch

Grommet

Spare Probe Sensor Switch

Step A4

Procedure

Disconnect the spade terminal connectors from the battery terminals.

Caution: Pay particular attention to polarity of the battery cable before reattaching. If battery cable polarity is reversed, it is likely that circuit damage will occur.

Remove battery. As required, remove the battery cushions on the inside of the battery

compartment and battery cover.

Illustration

Battery Cover

Plate

Foot Cushions

6-11

Section 6: Disassembly Guide

Step B1

Procedure

To separate the Front and Rear Case Assemblies:

Remove the SpO

2 connector hood by squeezing the sides to release the detents

holding the hood in place.

Illustration

SpO2 Connector Hood

Step B2

Procedure

Use a Phillips head screwdriver to remove the four screws fastening the front to rear case assemblies.

6-12

Separate the main front and rear case assemblies.

If the rear cover gasket seal is to be replaced, remove it.

Illustration

Rear Case

Assembly

Front Case Assembly

Section 6: Disassembly Guide

Step B2

Procedure

Disconnect the ribbon cable and its connector from the PCB assembly.

Illustration

Ribbon Cable and Connector

Procedure

To remove the Main PCB Assembly from the Front Case Assembly:

Use a Phillips head screwdriver to remove screws holding the Main PCB Assembly in place in the Front Cover Assembly.

For reassembly, note the two guides in the cover and the corresponding two notches in the PCB.

Illustration

6-13

Section 6: Disassembly Guide

Step B3

Procedure

Disconnect the remaining connectors at the Main PCB. Disconnect the battery cable spade terminals from the main PCB assembly. If

the battery cable is to be removed, the cable must also be disconnected from the battery, as described in Procedure A.

Caution: Pay particular attention to polarity of the battery cable before reattaching. If battery cable polarity is reversed, it is likely that circuit damage will occur.

Illustration

Luer Connector

to NIBP pump

tubing

Battery Cable

6-14

Section 6: Disassembly Guide

Step B3

Procedure

Unscrew the NIBP Luer connector. See Illustration in Step B2. There are now three separate items:

Front Cover Assembly Rear Case Assembly

Main PCBPCB Assembly

Illustration

Rear Case

Assembly

Main PCB Assembly

Front Case Assembly

6-15

Section 6: Disassembly Guide

6.5 FRONT CASE DISASSEMBLY

See Figure 6-2.

Step C1

To remove the Display:

Use a Phillips head screwdriver to unfasten the four corner screws and remove the display shield.

The four screws also hold the LCD assembly in place.

Speaker

Connector

Procedure

Illustration

Backlight Connector

Keypad Cable and Connector

Knob Encoder Assembly

6-16

Section 6: Disassembly Guide

Step C2

Procedure

Remove the LCD Assembly, providing access to the Display Window. Remove Display Window by carefully prying up one corner, then peeling back.

Illustration

Display

Window

Shield

LCD Assembly

Speaker

Spare Display Window

6-17

Section 6: Disassembly Guide

Step C3

Procedure

To remove the speaker:

Remove the retaining spring clip. Remove the speaker.

Illustration

Spare Speaker, Leads Attached

Step C4

Procedure

To remove the NPB Knob and Encoder:

From the front, remove the knob by grasping the sides of the knob firmly and pulling straight back from the monitor. (The knob is friction fit on the stem of the encoder assembly.)

Use a 9/16” hex socket to unscrew the fastening nut on the outside of the front case. The encoder may now be pulled away from the front case.

Illustration

Nut

Spare Knob

Encoder Assembl

6-18

Section 6: Disassembly Guide

Step C5

Procedure

To remove the Keypad

The keypad is attached with an adhesive to the front panel. From the front side of the panel, carefully pry up one corner of the keypad from the cover, and peel away from the cover.

Carefully, thread the cable out through the slot in the cover.

Illustration

Keypad,

Integral Cable

and Connector

Spare Knob

6-19

Section 6: Disassembly Guide

6.6 REAR CASE DISASSEMBLY

See Figure 6-3.

Step D1

To remove a Rear Connector PCB:

Use a Phillips head screwdriver to remove the two screws holding the Rear Connector PCB to the rear cover.

From outside the rear cover, use 3/16 socket driver to remove the two standoff fasteners of the RS-232 connector.

From inside the rear cover, remove the Rear Connector PCB Assembly.

NIBP Pump,

Hose and

Lead Attached

Procedure

Illustration

Rear Connector

Board Assembly

6-20

Section 6: Disassembly Guide

Step D2

Procedure

To remove NIBP Pump:

Use Phillips head screwdriver to unfasten screw holding clamp to rear cover. Disconnect power lead from Rear Connector PCB. Remove Clamp and Pump.

Illustration

Pump

Power Lead

NIBP Pump

Step D3

Procedure

To remove Handle and Foot Cushions:

Each end of the handle is friction-fit onto a cross-shaped boss. Use flat-bladed screwdriver to carefully pry one end of the handle.

When the end of the handle has begun to loosen from the boss, use the same technique to begin to pry up the other end.

Alternate prying action between each end of the handle until the handle is free of the rear case.

Foot cushions are attached with an adhesive to the bottom surface of the rear cover, and can be removed by lifting one end of the foot and peeling off.

6-21

Section 6: Disassembly Guide

6.7 MAIN PCB DISASSEMBLY

See Figure 6-4.

Step E1

To remove NIBP Pneumatic Assembly from the Main PCB Assembly:

Pull tubing from barbed fitting on rear of NIBP panel connector. Pull tubing from fittings on the pressure sensors and valve.

Pressure

Sensor

Procedure

Illustration

NIBP Pneumatic Assembly Group

Step E2

Procedure

To separate the Patient Connector PCB Assembly from the Main PCB Assembly:

Use wire cutters to remove the two Tinnerman fasteners securing the Patient Connector PCB Assy to the underside of the Main PCB.

Disconnect the Patient Connector PCB Assy by pulling it straight up from the Main PCB.

The battery fuse F301, located near the battery cable connector on the Main PCB, may be replaced if necessary.

Illustration

Patient Connector PCB

Main PCB

Assembly

Foot of Molded Connector Panel after removal of Tinnerman nut

6-22

Section 6: Disassembly Guide

Step E3

Procedure

To separate the Patient Connector PCB from the Connector Panel:

Use Phillips head screwdriver to remove four screws fastening the two assemblies together. NOTE: Two of the screws are accessible on the face of the Connector PCB; two are accessible through access holes in the PCB.

Illustration

Connector

Panel

Patient Connector PCB

6-23

SECTION 7: SPARE PARTS

7.1 Introduction

7.2 Top Level Assembly

7.3 Front Case Assembly

7.4 Rear Case Assembly

7.5 Main PCB Assembly

7.6 P-3900 Printer

7.1 INTRODUCTION

Spare parts, along with part numbers, are listed in the tables that follow. “Item No.” corresponds to the callout numbers in Figures A 29 through A-31 that are found in the Appendix. The “Step Ref.” corresponds to the disassembly procedures described in Section 6.

7.2 TOP LEVEL ASSEMBLY

Table 7-1: Top Level Assembly

Item

No.

Description NPB Part No. Step

Ref.

1 Battery Cover (Models 3910, 3930) 048935 A1 2 Battery Cover (Models 3920, 3940) 048936 A3 3 Battery 048987 A2/A4 4 Battery Pads 048937 A2/A4 5 Temperature Module Housing 048939 A3 6 Temperature Probe Sensor Switch 048992 A3 7 Temperature Probe Grommet 048938 A3 8 SpO2 Connector Hood 048942 B1

9 Rear Cover Gasket 048991 B2 10 Ribbon Cable and Connector 048934 B2 44 Battery Cable 048940 B3

7-1

Section 7: Spare Parts

7.3 FRONT CASE ASSEMBLY

Table 7-2: Front Case Assembly

Item

No.

11 Front Cover Assembly (with Keypad and

12 Display Shield 048944 C1 13 LCD Assembly 048943 C2 14 Display Window (with Gasket) 048945 C2 15 Speaker 048948 C3 16 Spring Retainer Clip and Pad 048990 C3 17 Knob 044727 C4 18 Encoder 291186 C4 19 Keypad 048946 C5

7.4 REAR CASE ASSEMBLY

Item

No.

Description NPB

Display Window)

Table 7-3: Rear Case Assembly

Description NPB

Step

Part No.

Ref.

048947 C2

Step

Part No.

Ref.

7-2

20 Rear Connector PCB (with Ribbon

048956 D1

Cable) 21 Pump Clamp 048989 D2 22 Pump Pad 048988 D2 23 NIBP Pump, Fitting, and Tubing 048949 D3 24 Rear Cover (Assembly) with Feet

048951 D3

Cushions and Gasket 25 Foot Cushion 048950 D3 45 Handle 048941 D3

7.5 MAIN PCB ASSEMBLY

Section 7: Spare Parts

Table 7-4: Main Board Assembly

Item

Description NPB Part No. Step

No.

26 Main PCB (Model 3910) 048952 E2 27 Main PCB (Model 3920/3940) 048953 E2 28 Main PCB (Model 3930) 048954 E2 30 NIBP Pneumatic (Assembly) with

048957 E1

Tubing, and Fittings 31 Patient Connector PCB (Model 3910) 048962 E3 32 Patient Connector PCB (Model 3920 048963 E3 33 Patient Connector PCB (Model 3930) 048964 E3 34 Patient Connector PCB (Model 3940) 048965 E3 35 Fuse F301, 4A 048970 E2 40 Connector Panel (Model 3910) 048966 E3 41 Connector Panel (Model 3920) 048967 E3 42 Connector Panel (Model 3930) 048968 E3

Ref.

43 Connector Panel (Model 3940) 048969 E3

Note: The Main PCB for all of the NPB-3900 models has jumpers which must

be set correctly so that the User Interface software is configured to support the measuring parameters of each particular model . There are

two jumpers, marked “JP101” and “JP102”, located immediately below the NIBP valve. Ensure that the jumpers are installed as noted in the table which follows:

Table 7-5: Main PCB Jumper Configuration

Model Number JP101 JP102

NPB-3910 Installed Installed NPB-3920 Installed Empty NPB-3930 Empty Installed NPB-3940 Empty Empty

7-3

Section 7: Spare Parts

7.6 P-3900 PRINTER

Spare parts, along with part numbers, are listed in the table that follows. “Item No.” corresponds to the callout numbers in Figure A-32 found in the Appendix.

Table 7-5: P-3900 Printer

Item

No.

Description NPB

Part No.

1 Battery, 12 V Rechargeable 048972 2 PCB Assembly 048971 3 Chassis 048973 4 Cover 048974 5 Cable, Battery to PCB 048976 6 Cable, Power Conn. to PCB 048977 7 Panel, Front 048978 8 AR-42 Printer Mechanism (complete) 048979 9 Door Assembly 048980

10 Switch, Membrane 048983 11 Rubber Foot 891435 12 Cable, RS-232 902202

7-4

SECTION 8: PACKING FOR SHIPMENT

8.1 General Instructions

8.2 Repacking in Original Carton

8.3 Repacking in a Different Carton

8.1 GENERAL INSTRUCTIONS

Pack the monitor carefully. Failure to follow the instructions in this section may result in loss or damage to the monitor. If the original shipping carton is not available, use another suitable carton. North American customers may call Nellcor Puritan Bennett Technical Services to obtain a shipping carton.

Prior to shipping the monitor, contact Nellcor Puritan Bennett’s Technical

Services Department or your local Nellcor Puritan Bennett representative for a returned goods authorization (RGA) number. Mark the shipping carton and any shipping documents with the RGA number. European customers not using RGA numbers, should return the product with a detailed, written description of the problem.

Return the monitor by any shipping method that provides proof of delivery. To pack the monitor for return, disconnect all cables. It is not necessary to return

sensors, patient cables, NIBP hose and cuff, temperature probe, or external power supply.

8.2 REPACKING IN ORIGINAL CARTON

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

1. Place the monitor in original packaging.

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

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

8.3 REPACKING IN A DIFFERENT CARTON

If the original carton is not available, use the following procedure to pack the monitor:

1. Place the monitor in a plastic bag.

2. Locate a corrugated cardboard shipping carton with at least 200 pounds per

square 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 box

completely with packing material.

5. Seal the carton with packing tape.

8-1

Section 8: Packing for Shipping

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

number, if applicable.

8-2

SECTION 9: SPECIFICATIONS

9.1 General

9.2 Electrical

9.3 Physical Characteristics

9.4 Environmental

9.5 Measuring Parameters

9.6 Trends

9.7 P-3900 Printer (Optional)

9.1 GENERAL

Size:

Width: 10.5” (26.7 cm) Height: 6.2” (15.7 cm) Depth: 3.7” (9.4 cm)

4.6” (11.7 cm) with temperature module

Weight:

Display:

9.2 SAFETY STANDARDS

IEC 601-1, UL 2601-1, CAN/CSA C22.2 601.1 Protection Class:

Degree of Protection: Mode of Operation:

4.9 lb (2.2 kg) excluding accessories, options, cables

Screen Type: Liquid Crystal Display (LCD),

Monochrome, Cold Cathode Fluorescent

Backlit Screen Size: 103 mm x 79 mm Resolution: 320 x 240 pixels

Class II, internally powered equipment, per

IEC 601-1, clause 2.2.5

Type CF: per IEC 601-1, clause 2.2.26

Continuous

9-1

Section 9: Specifications

9.3 ELECTRICAL

9.4 ENVIRONMENTAL

Power Sources Internal Battery:

Type: 6V, 4 Ampere Hours; Sealed, lead-acid Battery Operating Time: 4 hours, typical, for a fully charged battery,

at 25°C, one NIBP per 15 min.

External Power Supply:

PS-120V: 100 - 120VAC, 50 - 60 Hz, 0.15 A PS-240V: 220 - 240VAC, 50 - 60 Hz, 0.8 A

Mechanical Shock:

IEC 68-2-27; 100 g; 6 msec; three axes; 18 total shocks; non-operating

Mechanical Vibration:

IEC 68-2-6; Sinusoidal; 10 - 58 Hz; 0.15 in. displacement 58 - 150 Hz; 2 g acceleration 4 min/sweep; 20 sweeps/axes, non-operating

Thermal:

Operating Temperature: 0 to 50°C

Storage Temperature: -20 to 60°C

Humidity:

Operating: 5 to 95% RH, non-condensing Storage: 5 to 95% RH, non-condensing

Water Resistance:

IEC 529 Classification IPX1 (Protected against vertically dripping water)

Altitude:

0 - 10,000 ft ( 0 - 3050 m)

Electromagnetic Compatibility

9.5 MEASURING PARAMETERS

9.5.1 ECG Measurement/Display

Heart Rate Range: Heart Rate Accuracy:

9-2

Radiated and conducted electromagnetic energy per CISPR 11, Class B

20 - 250 BPM ±5 BPM

Bandwidth:

Normal Monitoring: 0.5 Hz to 40 Hz

Section 9: Specifications

Extended Low Frequency Response:

Leads: Display Sweep Speeds: Pacemaker Detection:

ECG Size (sensitivity): Lead Off Detection: Input Impedance:

CMMR (common mode rejection ratio):

Input Dynamic Range: Defibrillator Discharge

Recovery: Standards:

0.05 Hz to 40 Hz (user selectable)

3 Lead (user selectable)

12.5, 25, and 50 mm/sec Indicator on waveform display (user

selectable)

0.5, 1, 2, 4 mV/cm Detected and displayed

> 5 MΩ > 90 dB at 50 Hz or 60 Hz

±5 mV AC, ±300 mV DC <5 sec per IEC 601-2-27

<8 sec per AAMI EC13-1992 Meets the performance standards of

ANSI/AAMI EC13-1992. Instead of a 1 mV standardizing voltage (section 3.2.2.9), a fixed, 1 cm reference bar is always present in the ECG display, along with the ECG size setting expressed in mV/cm. The following information references particular sections of ANSI/AAMI EC13-1992.

Leads-off sensing waveform.

Section 3.1.2.1(b)

Tall T-wave rejection.

Section 3.1.2.1(c)

Heart rate averaging

Section 3.1.2.1(d)

Response to irregular rhythm.

Section 3.1.2.1(e)

Applied currents less than 0.25 microamps.

T-wave of 0.6 mV amplitude will not affect heart rate determination.

Averages six of the most recent eight detected R-R intervals excluding the longest and shortest of the eight intervals.

a) Ventricular bigeminy: the NPB-3900 counts both large and small QRS complexes to display a rate of 80 bpm.

9-3

Section 9: Specifications

b) Slow alternating ventricular bigeminy: the NPB-3900 inconsistently counts the large Twave following the first Q-wave and the smaller QRS complexes, Thus causing the rate to vary between 38 and 80. With slightly smaller T-wave, the rate was 30 bpm consistently.

c) Rapid alternating ventricular bigeminy: the NPB-3900 generally counts only the first QRS complex of each pair to display a rate of 60 bpm, with infrequent counting of the second complex, resulting in a momentary increase to 70 bpm.

d) Bi-directional systoles: the NPB-3900 counts both the positive and negative phases of the large complexes due to the long interval between them. It also counts the small complexes, for an averaged heart rate of 135 bpm, with variation between 127 and 157 bpm due to inconsistent counting.

Heart rate meter response time.

Section 3.1.2.1(f)

Time to alarm for tachycardia. 3.1.2.1(g)

a) Change from 80 to 120 BPM: 3 sec b) Change from 80 to 40 BPM: 7 sec

Waveform 4(a)

Amplitude

0.5 mV 1mV 2mV

Waveform 4(b)

Amplitude

1 mV

2mV 4mV

Pacemaker pulse rejection without over/undershoot. 3.1.4.1 a. For single (ventricular-only) pacemaker pulses alone, with 0.1 and 2.0

ms. pulse-widths and ±2 mV and ± 700 mV pulse-amplitudes, the NBP3900 correctly displays heart rate as zero bpm (Asystole).

9-4

Section 9: Specifications

b) For single (ventricular-only) pacemaker pulses with normally paced QRS-

T, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulseamplitudes, the NBP3900 correctly displays heart rate of the QRS-T rhythm (60 bpm for the specified test waveform).

c) For single (ventricular-only) pacemaker pulses with ineffectively paced

QRS pattern, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulse-amplitudes, the NBP3900 correctly displays heart rate of the underlying QRS-T rhythm (30 bpm).

d) For atrial/ventricular pacemaker pulses alone, with 0.1 and 2.0 ms. pulse-

widths and ±2 mV and ± 340 mV pulse-amplitudes, the NBP3900 correctly displays heart rate of zero bpm (Asystole).

e) For atrial/ventricular pacemaker pulses with normally paced QRS-T, with

0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulse-amplitudes, the NBP3900 correctly displays heart rate of the QRS-T rhythm (60 bpm), except for the case of 2.0 ms width and -700 mV amplitude, which causes a displayed heart rate of 120 bpm.

f) For atrial/ventricular pacemaker pulses with ineffectively paced QRS

pattern, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 340 mV pulse-amplitudes, the NBP3900 correctly displays heart rate of the underlying QRS-T rhythm (30 bpm).

Pacemaker pulse rejection with over/undershoot. 3.1.4.2

a) For single (ventricular-only) pacemaker pulses alone, with 0.1 and 2.0 ms.

pulse-widths and ±2 mV and ± 120 mV pulse-amplitudes, the NBP3900 correctly displays heart rate of zero bpm (Asystole), except for cases with

2.0ms width and ± 2mV amplitude and 25% over/undershoot (time constant t0 is 55 ms.) which cause a displayed heart rate of 60 bpm.

b) For single (ventricular-only) pacemaker pulses with normally paced QRS-

T, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulseamplitudes, the NBP-3900 correctly displays heart rate of the QRS-T rhythm (60 bpm), except for the case of 2.0 ms width and +700 mV amplitude, which causes a displayed heart rate of 120 bpm.

c) For single (ventricular-only) pacemaker pulses with ineffectively paced

QRS pattern, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 120 mV pulse-amplitudes, the NBP3900 correctly displays heart rate of the underlying QRS-T rhythm (30 bpm).

d) For atrial/ventricular pacemaker pulses alone, with 0.1 and 2.0 ms. pulse-

widths and ±2 mV and ± 120 mV pulse-amplitudes, the NBP3900 correctly displays heart rate of zero bpm (Asystole), except for cases with

2.0ms width and ± 2mV amplitude and 25% over/undershoot (time constant t0 is 55 ms.) which cause a displayed heart rate of 60 bpm.

9-5

Section 9: Specifications

e) For atrial/ventricular pacemaker pulses with normally paced QRS-T, with

0.1 and 2.0 ms. pulse-widths and ±2 mV and ± 700 mV pulse-amplitudes, the NBP3900 correctly displays heart rate of the QRS-T rhythm (60 bpm for the specified test waveform).

f) For atrial/ventricular pacemaker pulses with ineffectively paced QRS

pattern, with 0.1 and 2.0 ms. pulse-widths and ±2 mV and ±120 mV pulseamplitudes, the NBP3900 correctly displays heart rate of the underlying QRS-T rhythm (30 bpm).

9.5.2 NIBP (Noninvasive Blood Pressure) Measurement/Display

Technique:

Oscillometric

Measurement Modes:

Auto: Automatic BP measurements at intervals of 1,

3, 5, 10, 15, 30, 60, and 90 minutes

Manual: Single measurement initiated by Start/Stop

button

STAT: Series of consecutive measurements for 5

minutes

Cuff Pressure Display:

10 - 300 mmHg

Blood Pressure Measurement Range:

Systolic: 60 to 250 mmHg Mean Arterial Pressure: 30 to 235 mmHg Diastolic: 20 to 220 mmHg

Pulse Rate Range: Blood Pressure

Accuracy:

40 to 200 BPM Mean error and standard deviation per

ANSI/AAMI SP10, 1992

Pulse Rate Accuracy:

Standards:

9.5.3 Temperature Measurement/Display

Technique: Range: Accuracy: Measurement Time:

9-6

Greater of ±2 BPM or ±2% of pulse rate value

Meets performance standards of ANSI/AAMI SP10-1992

Welch-Allyn SureTemp

F to 108oF (28.9oC to 42.2oC)

±0.2

F, (±0.1°C)

Thermistor Probe

Oral - approximately 4 seconds Rectal - approximately 15 seconds

9.5.4 SpO2 Measurement/Display

Range:

Pulse Rate: 20–250 BPM

% Saturation: 0–100%

Accuracy:

Pulse Rate: ±3 BPM

2: 70–100%: ±2 digits

SpO

Accuracies are expressed as plus or minus “X” digits (saturation percentage points) between saturations of 70-100%. This variation equals plus or minus one standard deviation (1SD), which encompasses 68% of the population. All accuracy specifications are based on testing the subject monitor on healthy adult volunteers in induced hypoxia studies across the specified range. Adult accuracy is determined with Oxisensor II D-25 sensors. Accuracy for neonatal readings is determined with Oxisensor II N-25 sensors. In addition, the neonatal accuracy specification is adjusted to take into account the theoretical effects of fetal hemoglobin in neonatal blood on oximetry measurements.

Section 9: Specifications

0–69% Unspecified

Pulse Rate (optically derived)

Accuracies are expressed as plus or minus “X” bpm across the display range. This variation equals plus or minus 1 Standard Deviation, which encompasses 68% of the population.

9.6 TRENDS

Type: Memory Storage: Data interval:

Tabular Format:

Display interval:

9.7 P-3900 PRINTER (OPTIONAL)

Type: Size:

20–250 bpm ±3 bpm

Tabular 12 hours, nonvolatile 20 seconds: (Stored data point is the average

over 20-second interval) One table for all variables

Six fields per row (time and 5 vital signs) Per NIBP measurement, or 15 minutes for no

NIBP, or 20 seconds during alarm condition.

Thermal

6.7” x 3.8” x 5.0” (17.0cm x 9.7cm x 12.7cm)

Weight: Paper Width Print Speed:

3.8 lb (1.5 kg) 50 mm 25 mm/s

9-7

Section 9: Specifications

POWER SOURCES Internal Battery

Type: Sealed, lead-acid, 12V, 1.2 amp/hr

Battery Operating Time: 3 hours, typical, at 25

C (fifteen 20-second

printouts per hour)

External Power Supply

PS-120V PS-240V

100 - 120V, 50 - 60Hz, 0.15A 220 - 240V. 50 - 60 Hz, 0.8A

9-8

SECTION 10: RS-232 INTERFACE

10.1 Serial Interface Connections

10.2 Nurse Call

10.3 Exporting Trend Data

10.1 SERIAL INTERFACE CONNECTION

The 9-pin connector mounted on the rear panel provides an access port for a serial (RS-232) interface to the P-3900 Printer, or to a suitably configured personal computer. Alternatively, qualified service personnel can use the connector to send a Nurse Call signal.

NOTE: The “Communications Selection” item in monitor’s “Set-up Menu”

must be set to “Printer” if the P-3900 is to be used; or, must be set to “Trend Xfer” if trend data is to be exported to a personal computer. (Set-up Menu is opened by selecting the screwdriver icon found along the bottom of the display.)

Table 10-1: RS-232 Serial Interface

Connections

10.2 NURSE CALL

Pin # Signal Direction

1 not used 2 Rx data <<<< 3 Tx data >>>> 4 DTR >>>> 5 Signal Ground <<>> 6 DSR <<<< 7 RTS >>>> 8 CTS <<<< 9 Alarm Out >>>>

Pin 9 of the RS-232 serial interface connector provides an “Alarm Out” signal. Any time there is an alarm condition active in the NPB-3900, pin 9 will go to plus RS-232 level voltage (> +5 VDC), if “Nurse Call Signal” is set to ON in the Set-up Menu. Any time there is no active alarm condition, pin 9 will be at minus RS-232 level voltage (< -5 VDC). If in the Set-up Menu “Nurse Call Signal” is set to OFF, pin 9 will always be at the minus RS-232 level voltage. In order to make use of the Alarm Out signal, pin 9 should be connected to a high-

impedance circuit (> 1000Ω) and protected against transient voltages.

10-1

Section 10: RS-232 Interface

10.3 EXPORTING TREND DATA

In order to download trend data from the NPB-3900, communication software,

such as PROCOMM™, should be installed in the external computer. The transfer protocol should be set as follows:

Baud Rate: 19,200 Data Bits: 8 Start Bit: 1 Stop Bits: 1 Parity: None

Connect the NPB-3900 to the serial port of the computer using a null modem cable. Start the communication program on the computer and enter terminal emulation mode. To initiate the transfer, type tr (lower case is necessary), followed by a carriage return <cr>.

If the command is not accepted, the response to an invalid command is ??, followed by a carriage return <cr>.

In response to a valid command, the NPB-3900 will send a comma-delimited ASCII text file comprising the entire contents of the NPB-3900’s trend memory. Each line is divided into five main groups, separated by a space <sp> and ending with a carriage return <cr> and line feed <lf>. The format for each line is:

RECORD<sp>DATE<sp>TIME<sp>ALARMS<sp>VITALS<cr><lf> The fields within each group are identified and defined as follows:

RECORD:

record number, Format:

2 characters no leading zero suppression right justified

DATE:

day, month, year, Format:

day and month: 2 characters year: 4 characters no leading zero suppression right justified

10-2

Section 10: RS-232 Interface

TIME:

hours, minutes, seconds, Format:

2 characters no leading zero suppression right justified

ALARMS:

heart rate alarm, SpO2 alarm, (respiration rate alarm), systolic pressure alarm, diastolic pressure alarm, mean arterial pressure alarm, (temperature alarm),

Each field in this group is either: 0: corresponding vital sign was not in alarm state or, 1: corresponding vital sign was in alarm state

NOTE: In order to maintain a consistent trend data format between the

NPB-3900 and NPB-4000 patient monitors, the NPB-3900 maintains a

field for “respiration rate alarm” and “temperature alarm”, even though the NPB-3900 does not have an alarm for respiration rate or temperature. For the NPB-3900, the fields for “respiration rate alarm” and “temperature alarm” will always have a value of “0”.

VITALS:

heart rate, SpO2, (respiration rate), systolic pressure, diastolic pressure, mean arterial pressure, temperature,

Field Name Units Format

heart rate 1/min 4 characters; leading zeroes

suppressed; right justified

SpO2 % 4 characters; leading zeroes

suppressed; right justified

respiration rate - value will always be “0”; right

justified

systolic pressure mmHg 4 characters; leading zeroes

suppressed; right justified

diastolic pressure mmHg 4 characters; leading zeroes

suppressed; right justified

mean arterial pressure

temperature degrees C

mmHg 4 characters; leading zeroes

suppressed; right justified 4 characters, including decimal

(no degrees F)

point; leading zero not suppressed; right justified

10-3

Section 10: RS-232 Interface

01, 04,02,1998, 08,37,22, 0,0,0,0,0,0,0, 72, 96, 0, 140, 90, 106,37.8,

01, 04,02,1998, 08,37,02, 0,1,0,0,0,0,0, 69, 82, 0, , , ,38.0,

02, 04,01,1998, 22,43,05, 0,0,0,0,0,0,0, 103,----, 0, , , ,38.2,

02, 04,01,1998, 22,42,45, 0,0,0,0,0,0,0, 103,----, 0, 127, 73, 95,38.1,

NOTE: In order to maintain a consistent trend data format between the

NPB-3900 and NPB-4000 patient monitors, the NPB-3900 maintains a

field for “respiration rate”, even though the NPB-3900 does not measure respiration rate. For the NPB-3900, the field for “respiration rate” will always have a value of “0”.

If no vital sign was measured during a 20-second trend interval, characters in the corresponding field will be blank (<sp><sp><sp><sp>,). If the vital sign displayed dashes during a 20-second trend interval, characters in the corresponding field will contain dashes (----,).

Example of several lines of a trend file:

10-4

APPENDIX - TECHNICAL SUPPLEMENT

A-1 General A-2 Block Diagram A-3 Isolated Patient Connection Section A-4 Temperature Measurement Circuit A-5 ECG Inputs A-6 On/Off Power Control A-7 Audio Volume and Speaker Drive A-8 Power Supplies A-9 NIBP Section A-10 System A/D A-11 Buttons and Lights A-12 SpO A-13 Microcontroller A-14 Program Storage/Execution A-15 DRAM Control A-16 Real Time Clock A-17 UART Operation A-18 FPGA Glue Logic

A-1 GENERAL

This section contains descriptions of the principles of operation of the major functional modules of the monitor, including the overall block diagram, power supply, isolated front end, NIBP control, the SpO microcontroller.

A-2 BLOCK DIAGRAM

The Monitor (see Figure A-1) contains an isolated front-end section, powered by an isolated power supply, and in which the signals from SpO ECG sensors are processed. The plastic tubing provides sufficient isolation for signals from the cuff in NIBP monitoring.

2 processing module, and

2, temperature, and

A single A/D converter is used to digitize processed temperature, NIBP, and ECG inputs; the SpO2 module produces digitized data.

A microcontroller, Intel 386, requests and receives instructions from a flash memory. The processor has a 16-bit data bus, and uses 19 of the 24-bit address bus. These, and eight control signals, are used to read and write to the DRAM, flash memory, UART, and FPGA (programmable gate array). Other interface connections are made through the I/O port signals, timer signals, and interrupt signals.

A-1

Appendix - Technical Supplement

The FPGA provides signals for control and data to the LCD. Bias voltage and backlight power for the LCD are provided by the power supply section. The FPGA processes front-panel button and Nellcor Puritan Bennett knob operations.

Circuit details for these blocks are contained in this section, of the manual. This section provides a brief theory of operation of the circuits noted in the block diagram. Portions of the schematic diagrams are reproduced for some paragraphs.

Temp Probe

Switch

TEMP Probe

ECG Input Connector

SPO2 Input

Connector

NIBP

Fitting

ISOLATED FRONT END

Pressure Sensor

Proportiona

Keypad/Knob

RTC

FPGA DRAM

CNTL

FLASH ADDRESS FPGA ADDRESS

FLASH

ON/OFF Control

and Watchdog

DRAM CNTL

ADDRESS BUS

FPGA DATA

16 Bit Bi-directional bus

FLASH DATA

ON/OFF Control

Failure

Alarm

Volume Control

Audio Driver

6V 4AH Battery

LCD CNTL/DATA

DRAM ADDRESS

Back Light Power

Supply (300 VRMS)

+5 V

DRAM DATA

Speake

Battery Charger

LCD Display

Bias

Voltage

Charger

Connecto

Backlight

Power

RS-232

Connecto

External

16V RMS

Battery

AC INPUT

Charger

FRONT END CNTL

A/D

SPO2 SERIAL CNTL

PS CLK

MSTR

CLK

OSC

A/D

CNTL

386EX

C STEP

FLASH CNTL

UART/RS232

+5 V Regulator

ISO PS

Heater

TEMP

XFMR

DIG

OPTO

LIN

ECG

OPTO

SPO2

Pump

Valve

DIG

OPTO

NIBP

Amplifiers

Ven

LCD Bias Regulator

+3.3 V Regulator

Figure A-1: NPB-3900 Block Diagram

A-3 ISOLATED PATIENT CONNECTION SECTION

A-3.1 General

The connections to the patient consist of:

ECG (three directly connected leads) Temperature (probe)

2 (DS-100A sensor, etc.)

SpO NIBP (pneumatic cuff)

A-2

Nellcor NPB-3900 User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.1 Manual Overview

1.4 P-3900 INTRODUCTION

1.5 RELATED DOCUMENTS

2.1 Cleaning

2.3 Battery

2.4 ENVIRONMENTAL PROTECTION

3.1 Introduction

3.2 Equipment Needed

3.3 PERFORMANCE TESTS

3.4 SAFETY TESTS

4.1 Introduction

4.2 Power-up Defaults Menu

4.3 RESTORING FACTORY SETTINGS

4.4 DIAGNOSTIC MODE

5.1 Introduction

5.2 How to Use this Section

5.3 Who Should Perform Repairs

5.4 Replacement Level Supported

5.5 OBTAINING REPLACEMENT PARTS

5.6 TROUBLESHOOTING GUIDE

5.7 TROUBLESHOOTING THE OXIMETRY FUNCTION

5.8 P-3900 TROUBLESHOOTING GUIDE

6.1 Introduction

6.2 HOW TO USE THIS SECTION

6.3 DISASSEMBLY FLOW CHARTS

6.4 CLOSED CASE DISASSEMBLY

6.5 FRONT CASE DISASSEMBLY

6.6 REAR CASE DISASSEMBLY

6.7 MAIN PCB DISASSEMBLY

7.1 Introduction

7.2 Top Level Assembly

7.3 FRONT CASE ASSEMBLY

7.4 REAR CASE ASSEMBLY

7.6 P-3900 PRINTER

8.1 General Instructions

8.2 Repacking in Original Carton

8.3 Repacking in a Different Carton

9.1 General

9.2 SAFETY STANDARDS

9.3 ELECTRICAL

9.4 ENVIRONMENTAL

9.5 MEASURING PARAMETERS

9.6 TRENDS

9.7 P-3900 PRINTER (OPTIONAL)

10.2 Nurse Call

10.1 SERIAL INTERFACE CONNECTION

10.3 EXPORTING TREND DATA

APPENDIX - TECHNICAL SUPPLEMENT

A-1 GENERAL

A-2 BLOCK DIAGRAM

A-3 ISOLATED PATIENT CONNECTION SECTION