Philips M3921A, M3922A, M3923A, M3924A, M3926A User manual

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Philips A1 and A3 Patient Monitors

A1 Models: M3921A

M3922A M3923A M3924A

A3 Models: M3926A

M3927A M3928A M3929A

Service Guide

*M3921-9000C

Part Number M3921-9000C

Printed in the U.S.A. February 2002

First Edition

Page 2

About this Manual

Proprietary Information

This document contains proprietary information, which is protected by copyright. All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws.

Philips Medical Systems 3000 Minuteman Road Andover, MA 01810-1085 (978) 687-1501

Publication number M3921-9000C Printed in USA

Warranty

The information contained in this document is subject to change without notice.

Philips Medical Systems makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties or merchantability and fitness for Philips Medical Systems shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

Copyright

Printing History

New editions of this document incorporate all material updated since the previous edition. Update packages may be issued between editions and contain replacement and additional pages to be merged by a revision date at the bottom of the page. Pages that are rearranged due to changes on a previous page are not considered revised.

The documentation printing date and part number indicate its current edition. The printing date changes when a new edition is printed. (Minor corrections and updates that are incorporated at reprint do not cause the date to change.) The document part number changes when extensive technical changes are incorporated.

This edition, M3921-9000C combines both A1 and A3 Service Guides into one book. There is no M3921-9000B book.

First Edition............................................................... February 2002

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Philips Software License Terms

ATTENTION: USE OF THE SOFTWARE IS SUBJECT TO THE PHILIPS SOFTWARE LICENSE

TERMS SET FORTH BELOW. USING THE SOFTWARE INDICATES YOUR ACCEPTANCE OF THESE LICENSE TERMS. IF YOU DO NOT ACCEPT THESE LICENSE TERMS, YOU MAY RETURN THE SOFTWARE FOR A FULL REFUND. IF THE SOFTWARE IS BUNDLED WITH ANOTHER PRODUCT, YOU MAY RETURN THE ENTIRE UNUSED PRODUCT FOR A FULL REFUND.

PHILIPS SOFTWARE LICENSE TERMS

The following License Terms govern your use of the accompanying Software unless you have a separate signed agreement with Philips Medical Systems.

License Grant. Philips Medical Systems grants you a license to Use one copy of the Software. "Use" means storing, loading, installing, executing or displaying the Software. You may not modify the Software or disable any licensing or control features of the Software. If the Software is licensed for "concurrent use", you may not allow more than the maximum number of authorized users to Use the Software concurrently.

About this Manual

Ownership. The Software is owned and copyrighted by Philips or its third party suppliers. Your license confers no title to, or ownership in, the Software and is not a sale of any rights in the Software. Philips’ third party suppliers may protect their rights in the event of any violation of these License Terms.

Copies and Adaptations. You may only make copies or adaptations of the Software for archival purposes or when copying or adaptation is an essential step in the authorized Use of the Software. You must reproduce all copyright notices in the original Software on all copies or adaptations. You may not copy the Software onto any public network.

No Disassembly or Decryption. You may not disassemble or decompile the Software unless Philips prior written consent is obtained. In some jurisdictions, Philips consent may not be required for limited disassembly or decompilation. Upon request, you will provide Philips with reasonably detailed information regarding any disassembly or decompilation. You may not decrypt the Software unless decryption is a necessary part of the operation of the Software.

Transfer. Your license will automatically terminate upon any transfer of the Software. Upon transfer, you must deliver the Software, including any copies and related documentation, to the transferee. The transferee must accept these License Terms as a condition to the transfer.

Termination. Philips Medical Systems may terminate your license upon notice for failure to comply with any of these License Terms. Upon termination, you must immediately destroy the Software, together with all copies, adaptations and merged portions in any form.

Export Requirements. You may not export or re-export the Software or any copy or adaptation in violation of any applicable laws or regulations.

U.S. Government Restricted Rights. The Software and any accompanying documentation have been developed entirely at private expense. They are delivered and licensed as

iii

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About this Manual

"commercial computer software" as defined in DFARS 252.227-7013 (Oct. 1988), DFARS

252.211-7015 (May 1991) or DFARS 252.227-7014 (Jun. 1995), as a "commercial item" as defined in FAR 2.101(a), or as "Restricted computer software" as defined in FAR 52.227-19 (Jun. 1987)(or any equivalent agency regulation or contract clause), whichever is applicable. You have only those rights provided for such Software and any accompanying documentation by the applicable FAR or DFARS clause or the Philips standard software agreement for the product involved.

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Text Conventions

The following conventions for Notes, Cautions, and Warnings are used in this manual.

NOTE

A Note calls attention to an important point in the text.

A Caution calls attention to a condition or possible situation that could damage or destroy the product or the user’s work.

A Warning calls attention to a condition or possible situation that could cause injury to the user and/or patient.

About this Manual

Caution

WarningWarning

Explanation of Symbols

Symbols on products and packaging mean the following:

Battery Gauge icon

Defibrillator-proof type CF equipment

On/Standby button.

Alarm Limits icon.

Adjust Screen Contrast to display (monochrome) or invert the video to (color).

Adjust Heart Rate Tone volume.

Initiate NiBP measurement

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About this Manual

Temperature

NiBP

ECG

SpO

Located on recorder. Produces a 20 Second Snapshot

Located on recorder. Produces a Continuous Print

Signal (ECG) Input

Signal (ECG) Output

Data input/output

Alternating Current

Direct Current

Temperature

Humidity

Altitude or atmospheric pressure

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About this Manual

Contains parts that may not be put into normal waste disposal but must be recycled or

dealt wi disposed as chemical waste

Fragile, handle with care

Keep dry

Consult instructions for use

Date of manufacture

Refer to User’s Guide

DC Lines

DC Input

Defib Sync.

RS-232 I/O

Class II Equipment

Power supply if for indoor use only

Silence Alarm

Equipotential Ground

vii

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About this Manual

Recorder’s front-panel charging LED

Recorder’s front-panel communication LED

Ground Wire

viii

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Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Manual Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Patient Monitor Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Introduction to External Recorder (M3925A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Periodic Safety And Functional Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Environmental Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3. Performance Verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Test And Inspection Matrix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Equipment Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Performance Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Battery Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Battery Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Power-On Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Hardware and Software Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

SpO

Operation with an ECG Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Operation with a Respiration Simulator (A3 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Verification of Pneumatic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Operation with a Temperature Simulator (A1 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Operation with a Temperature Simulator (A3 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

General Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Serial Interface Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Printer Verification (For A1 Optional Printer M3925A) . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Safety Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Ground Integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Electrical Leakage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4. Power-up Defaults Menu And Diagnostic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Power-up Defaults Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Diagnostic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

System A/D Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

NIBP Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Restoring Factory Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Contents ix

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5. Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

How To Use This Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Who Should Perform Repairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Replacement Level Supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Obtaining Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Generating an Error Log Printout (A1 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Serviceable Hardware Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Other Error Codes (All Monitors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Buttons/Wheels (All Monitors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Display/Audible Tones (All Monitors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Operational Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

6. Disassembly Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

How To Use This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Disassembly Procedures (A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Closed Case Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Separation of Front and Rear Case Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Front Case Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Rear Case Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Main PCB Disassembly Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Disassembly Procedures (A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Closed Case Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Separation of Front and Rear Case Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Front Case Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Rear Case Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

7. Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Small Parts Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Top Level Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Front Case Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Rear Case Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Main PCB Assembly (A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Power Supply, Cables, and Miscellaneous Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Exchange Unit Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

8. Packing For Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Repacking In Original Carton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Repacking In A Different Carton. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

x Contents

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9. RS-232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116

Nurse Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

10. Training Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117

Levels of Involvement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Preventative Maintenance Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Phone Support or Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117

Training Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Essential Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Optional Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Support Strategies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120

Unit exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Bench repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120

Theory of Operation and System Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121

System Overview - A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Block Diagram - A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Block Diagram - A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

System Overview - A3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Block Diagram - A3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Block Diagram - A3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129

Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Monitor Applications and Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Reference Documents and Other Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Preventative Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Index

Contents xi

Page 12

xii Contents

Page 13

Manual Overview

Introduction

This manual contains information for servicing the A1 and A3 patient monitors, subsequently referred to as the monitor throughout this manual. Only where there are differences in service procedures for the two monitor types is each monitor referred to specifically as A1 and A3. Only qualified service personnel should service this product. Before servicing the monitor, read the User Guide carefully for a thorough understanding of operation.

Introduction 1

Page 14

Patient Monitor Description

The purpose and function of the patient monitor is to monitor: ECG; heart rate; noninvasive blood pressure (systolic, diastolic, and mean arterial pressures); functional arterial oxygen saturation; respiration rate (A3 only); and temperature for adult and pediatric patients in all hospital areas and hospital-type facilities. It can be used during hospital transport and in mobile, land-based environments, such as ambulances.

The physical and operational characteristics of the monitor are described in the User Guide.

The measurement parameters and features for each model are indicated below.

Model

NIBP SpO

M3921A Yes Yes No No No No Mono

M3922A Yes Yes Yes No No No Mono

M3923A Yes Yes No Yes No No Mono

M3924A Yes Yes Yes Yes No No Mono

M3925A Optional Standalone Recorder for A1

M3926A Yes Yes Yes Yes Yes

M3927A Yes Yes Yes Yes Yes

M3928A Yes Yes Yes Yes Yes

M3929A Yes Yes Yes Yes Yes

Measurement Parameters and Features

Temp ECG Resp Integral

A1 Monitor

A3 Monitor

Recorder

Yes

Color/ Mono

Mono

Color

2 Introduction

Page 15

Introduction to External Recorder (M3925A)

The recorder is an optional, standalone printer designed for use with the A1 patient monitor. The recorder communicates with the monitor using a nullmodem cable connected between each device’s RS-232 connector.

The recorder contains an internal battery, which, when fully charged, will operate the recorder for 3 hours (typical, at 25°C, producing fifteen 20-second printouts per hour). The recorder can be connected to AC power using an external power supply. The recorder uses the same type of power supply as the A1 monitor, the PS-120V or PS-240V.

The recorder does not have an On/Off switch. The recorder can sense when it has an established communication link with the monitor. At that time, the green LINKED indicator on the front panel lights, indicating that the recorder is ready for operation. See the recorder’s User Guide for more information regarding its operation.

Introduction to External Recorder (M3925A)

Routine Maintenance

Cleaning

Warning Do not immerse the monitor or its accessories in liquid or

clean with caustic or abrasive cleaners. Do not spray or pour any liquid on the monitor or its accessories.

To clean the monitor, 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.

Periodic Safety And Functional Checks

The monitor requires cleaning, battery maintenance and NiBP performance and verification check every two years. The following performance verification tests may be used following repair or during routine maintenance (if required by your local institution).

1. Inspect the exterior of the monitor for damage.

2. Inspect labels for legibility. If the labels are not legible, contact Philips’ Response Center or your local Philips representative.

3. Verify that the NiBP performs properly as described in “Verification of Pneumatic System” on page 21.

Battery

If the monitor has not been used for a long period of time, the battery will need charging. To charge the battery, connect the monitor to an AC outlet, or external DC supply in the case of the A3, as described in “Battery Charge” on page 13 or the “Setup and Use” chapter of the User Guide.

Note Storing the monitor for a long period without charging the battery

can degrade the battery capacity. A complete battery recharge requires 8 hours.

Chapter 2 - Routine Maintenance 5

Page 18

Environmental Protection

The battery can be recharged while the monitor is in use, in which case, the battery requires 14 hours to be recharged.

The battery can require a full discharge/charge cycle to restore normal capacity.

If the monitor operates1 for less than one hour on battery power before the low battery alarm occurs, the battery should be conditioned.

If the same symptom persists even after the battery is conditioned and indicating a full charge, the battery should be replaced.

Refer to Chapter 6, “Disassembly Guide”.

Environmental Protection

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

1. See “Battery Performance Test” on page 14 for typical battery operating times and conditions.

6 Chapter 2 - Routine Maintenance

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Introduction

Performance Verification

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

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

Performance Verification 7

Page 20

Test And Inspection Matrix

The following test map shows which tests are required in which situations.

Table 1 Test Map

Service Event (When

Performing…)

Installation Visual and Power On Tests

Repairs

A. Unit Exchange Visual and Power On Tests

B. Unit Opened Power On Test

C. NBP Pump replaced Power On Test

D. SpO

E. Front End Connectors replaced Power On Test

Module replaced Power On Test

Test Blocks Required (…Complete

these Tests)

Basic Pneumatic Leakage Test (BPL)

Ground Integrity Test

Leakage Current Test

NBP Tests:

Pneumatic Leakage and Inflation Rate

BPL Test

Tests:

SpO

Dynamic Operating Range and

LED Excitation

BPL Test

Performance test for the parameter that had the connector replaced.

F. Power Supply replaced (A3 only) Power On, BPL, and Safety tests

G. Component level repair on any

PC board

H. Main PC board replaced Power On Test

All software upgrades Power On

Preventative maintenance Power On and NBP Performance Tests

8 Performance Verification

Power On Test

All Performance Tests

All Safety Tests

All Performance tests except Battery Charge Test and Battery Performance Test

Page 21

Table 2 Test and Inspection Reporting

Test And Inspection Matrix

Test

Visual: Inspect exterior of monitor for damage

Power-On Self-Test Displays Normal Monitoring

Basic Pneumatic Leakage Test (NBP test)

NiBP Accuracy Test 250 mmHg; ±5 mmHg

NiBP Leakage Test After 1 Minute at 250 mmHg,

NiBP Inflation Rate Test

NiBP Overpressure Test

Expected Results

No Visual Damage V:P or V:F

Screen Configuration and emits tones

After 1 minute at approximately 250 mmHg, pressure drops no more than 6 mmHg.

pressure drops no more than 6 mmHg

Monitor Reports NiBP = 280 mmHg in <6 seconds

Overpressure Deflation is activated at a value between 280 mmHg to 330 mmHg

What to Record

PO:P or PO:F

BPL: Px6

Where x6 =Pressure Drop in mmHg

PN:P/X1…X4 (or X5

PN:F/X1…X4 (or X5

Record Pressure in mmHg = X1

Record Pressure Drop in mmHg = X2

Record Time to 280 mmHg in Seconds = X3

Record value in mmHg at which Overpressure Deflation occurs =X4

)

NiBP Deflation Rate Test (A3 only)

Safety Performance Tests

Monitor reports NiBP >10 mmHg and <190 mmHg

All Safety Performance Tests are in range of Table 5 to Table 12

Record value in mmHg on monitor at 1 min = X5

S:P or S:F

1. Details of the tests are included later in this chapter.

2. When authorized Philips Medical Systems personnel service the instrument. The results are reported back to Philips. The collected data form a database to be used in product development. It is not necessary for hospital personnel to report these results.

3. In the case of the NiBP Deflation Rate Test, applicable to the A3 only.

Performance Verification 9

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Equipment Needed

The following table lists the equipment required for performance verification.

Table 3 Required Test Equipment

Required For

Equipment Description A1 A3

Digital multimeter (DMM)

Sensor extension cable M4787A

Finger clip sensor M4789A

Oxisensor® II adhesive sensor

ECG cable M3913A M3923A and

ECG electrodes Standard M3923A and

ECG leads M3914A (IEC) or M3915A

NiBP tubing M3918A

NiBP cuff 40401C

Pulse oximeter tester Nellcor Puritan Bennett SRC-2

ECG simulator Dynatech Nevada medSim

Fluke Model 87 or equivalent

D-25

(AAMI)

300 or equivalent

··

M3924A only

M3923A and M3924A only

··

NiBP simulator Bio-Tek BP Pump or

equivalent

Temperature simulator medSim 300 or equivalent M3922A and

Respiration simulator medSim 300 or equivalent

Safety analyzer Bio-Tek 601 Pro or equivalent

Stopwatch Manual or electronic

10 Performance Verification

··

M3924A only

-·

··

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Performance Tests

Battery Charge

Performance Tests

The battery charge and battery performance test should be performed before monitor repairs whenever the battery is suspected as being a source of the problems. All other tests can be used following repairs or during routine maintenance (if required by your local institution). Before performing the battery performance test, ensure that the battery is fully charged. (See “Battery Charge” below).

This section is written using factory-set power-up defaults. If your institution has pre configured custom defaults, those values display.

To fully charge the battery:

1. Connect the monitor to an AC power source using the proper power cord. For the A1, use the PS-120V or PS-240V external power supply and power cord.

2. • For the A1, verify that the EXTERNAL POWER indicator is

lit.

• For the A3, verify that the

BATTERY CHARGING/AC SOURCE

indicator is lit.

3. Charge the battery for at least 8 hours.

The battery can require a complete discharge/charge cycle to restore its normal capacity, depending on its previous usage.

4. To check for a full charge, perform the procedure described in “Battery Performance Test” on page 12.

Performance Verification 11

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Battery Performance Test

The the A1 and A3 mono monitors are specified to typically operate on battery power for a minimum of 4 hours, at 25°C, with no printing, and one NiBP measurement every 15 minutes. The A3 color monitor is specified to typically operate on battery power for a minimum of 3 hours, at 25°C, with no printing, and one NiBP measurement every 15 minutes. Before performing this test, ensure that the battery is fully charged (see “Battery Charge”).

1. Connect the Nellcor Puritan Bennett SRC-2 pulse oximeter tester to the monitor via the M4787A sensor cable.

2. Connect the NiBP simulator to the monitor via the M3918A tubing.

3. Set the SRC-2 switches as follows:

SWITCH POSITION

RATE 38

LIGHT LOW

MODULATION LOW

RCAL/MODE RCAL 63/LOCAL

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

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

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

7. Verify that the monitor is responding to the SpO audible alarm is sounding. Use the wheel to select the SpO permanently silence the SpO

8. Use the wheel 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 start the first NiBP measurement. Subsequent NiBP

measurements are taken automatically every 15 minutes.

audible alarm.

simulator signal and that the

Menu and

12 Performance Verification

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Power-On Self-Test

9. The A1 and A3 mono monitors must operate for at least 4 hours before they automatically power down due to low battery condition. The A3 color monitor must operate for at least 3 hours before the monitor automatically powers down due to low battery condition.

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

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

12. If monitor passes this test, immediately recharge the battery. (See “Battery Charge” on page 11).

1. Connect the monitor to an AC power source. For the A1, use the PS-120V or PS-240V power supply and power cord. For the A3, use the proper power cord supplied.

2. • For the A1, verify that the EXTERNAL POWER indicator is

lit.

• For the A3, verify that the

BATTERY CHARGING/AC SOURCE

indicator is lit.

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

4. Observe the monitor front panel. With the monitor off, press the ON/

STANDBY button . The monitor must perform the following sequence:

a. The A1 emits a beep.

The A3 emits three consecutively higher pitched beeps.

b. A few seconds later, the display backlight illuminates, but the display is

blank.

c. The version numbers of the boot and operational software display in the

lower left corner of the display.

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

approximately 10 seconds to complete.

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

normal monitoring screen configuration. No vital-sign numeric values or waveforms are displayed.

Performance Verification 13

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Hardware and Software Tests

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

SpO2 Testing A1, A3 - all models

Operation with an ECG Simulator A1 - M3923A, M3924A

Operation with a Respiration Simulator A3 - all models

Verification of Pneumatic System A1, A3 - all models

Operation with a Temperature Simulator A1 - M3922A, M3924A

Test Applies to Model(s)

A3 - all models

SpO

Testing

Alarms and Alarm

Silence

General Operation A1, A3 - all models

SpO2 testing includes the following tests:

n Alarms and Alarm Silence

n Heart Rate Tone Volume Control

n Dynamic Operating Range

n LED Excitation Test

1. Connect the SRC-2 pulse oximeter tester to the M4787A sensor cable and connect the cable to the monitor.

2. Set SRC-2 as follows:

SWITCH POSITION

RATE 38

LIGHT LOW

MODULATION OFF

RCAL/MODE RCAL 63/LOCAL

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

4. After the normal power-up sequence, verify that the SpO

14 Performance Verification

% display initially

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Hardware and Software Tests

indicates zero or is blank. The pulse bar can occasionally indicate a step change as the monitor is in the pulse search mode.

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

6. 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

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

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. For this test, the user should set the heart rate

tone source to SpO

7. Press the ALARM SILENCE button on the front panel of the monitor.

The audible alarm is temporarily silenced.

8. 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

% and HEART RATE displays continue flashing.

from the Heart Rate Menu.

d. The heart rate tone remains audible.

e. The audible alarm returns in approximately 60 seconds.

Heart Rate Tone

Volume Control

1. Connect the SRC-2 pulse oximeter tester to the M4787A sensor cable and connect the cable to the monitor.

2. Set SRC-2 as follows:

POSITION

SWITCH

A1 A3

RATE 38 38

LIGHT LOW LOW

MODULATION LOW OFF

RCAL/MODE RCAL 63/LOCAL RCAL 63/LOCAL

Performance Verification 15

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Hardware and Software Tests

3. Power on the monitor and verify that the SpO2 and heart rate values are

correctly displayed.

4. Press the ALARM SILENCE button on the front panel of the monitor

to temporarily silence the audible alarm.

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

SpO

6. Press the Heart Rate Tone VOLUME button on the front panel of the

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

7. Rotate the wheel counterclockwise and verify that the beeping heart rate tone decreases until it is no longer audible. Rotate the wheel clockwise to return the beep volume to a comfortable level.

3 seconds after the last button-press or rotation of the wheel, function of the wheel reverts to moving the highlight on the display screen.

Dynamic Operating

Range

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

1. Connect the pulse oximeter tester to the monitor and turn the monitor on.

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

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

Table 4 SRC 2 Settings and Monitor Indications

SRC-2 Settings Monitor Indications

RATE LIGHT MODULATION SpO2 Pulse Rate

38 HIGH2 LOW

112 HIGH1 HIGH

201 LOW LOW

201 LOW HIGH 79-83* 195-207*

An * indicates values that produce an alarm. Press the ALARM SILENCE button to temporarily silence the audible alarm.

For the pulse rate setting of 201 bpm, the pulse rate tolerance of 195 to 207 bpm is greater than the ±3 bpm accuracy specification of the monitor, due to the performance characteristics of the SRC-2 tester.

79-83* 35-41*

79-83* 109-115

79-83* 195-207*

4. Turn the monitor off.

LED Excitation Test

16 Performance Verification

This procedure uses normal system components to test circuit operation. A

Page 29

Hardware and Software Tests

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 a M4787A 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 photo detector visible.

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

6. Slowly move the sensor LED in proximity to the photo detector 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 micro-processor is in proper control of LED intensity.

9. Turn the monitor off.

Operation with an ECG Simulator

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

2. Connect the leads to the ECG cable.

3. Connect the cable to the ECG input port on the monitor.

4. Set the ECG simulator as follows:

Heart rate: 30 bpm

Amplitude: 1 millivolt

Lead select: II

Wave Type: Normal sinus rhythm

Patient Type: 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.

5. Press On/Standby button to turn monitor on.

Performance Verification 17

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Hardware and Software Tests

6. After 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

indicating heart rate is below the default lower alarm limit.

7. Press the ALARM SILENCE button. Verify that the audible alarm is

silenced.

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

9. After at least five heartbeats, verify that the monitor displays a heart rate of 240 ±5 bpm.

10. Verify that the audible alarm sounds and the indicating that the heart rate is above the default upper alarm limit.

11. Press ALARM SILENCE button to silence alarm.

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

13. After at least five heartbeats, verify that the monitor displays a heart rate of 120 ±5 bpm.

14. Disconnect the LL lead from ECG simulator.

15. Verify that the

displayed in sounds.

16. Reconnect the LL lead to ECG simulator. Verify that the message no longer appears and audible alarm is silenced.

17. Repeat steps 14 through 16 for LA and RA leads.

18. Turn the monitor off.

Leads Off alarm message appears, three dashes are

HEART RATE display, and the low priority audible alarm

HEART RATE display flashes,

Leads Off alarm

Operation with a Respiration Simulator (A3 only)

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

2. Connect the ECG leads to the ECG cable.

3. Connect the cable to the ECG input port on the monitor.

Note

The accuracy of A3 measurements is ±3 breaths per minute. In the procedure below, add the tolerance of the simulator to the acceptable range of readings.

4. Set the simulator for a respiration rate of 120 breaths per minute.

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

18 Performance Verification

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Hardware and Software Tests

6. After the normal power-up sequence, verify the following monitor reactions:

a. The monitor displays a respiration rate of 120 ±3 breaths per minute.

b. The audible alarm sounds and

indicating respiration rate is above default upper alarm limit.

7. Press the ALARM SILENCE button . Verify that the alarm is silenced.

8. Decrease the respiration rate setting on the respiration simulator to 20 breaths per minute.

9. Verify that the monitor displays a respiration rate of 20 ±3 breaths per minute.

Verification of Pneumatic System

The following tests, from “Basic Pneumatic Leakage Test” on page 19 through “Over-Pressure” on page 23, verify the functionality of the pneumatic system of the monitor. All these tests, with the exception of the Basic Pneumatic Leakage Test, require the use of an appropriate NiBP simulator. Although the tests were designed to use the Bio-Tek BP Pump noninvasive blood pressure simulator, any equivalent NiBP simulator with the same internal test volume can be used. The internal test volume of the Bio-Tek simulator is 250 ml.

The monitor 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 Chapter 4, “Power-up Defaults Menu And Diagnostic Mode”.

RESPIRATION RATE display flashes,

Basic Pneumatic

Leakage Test

The purpose of this test is to verify the integrity of the NiBP Pneumatic System after the monitor has been opened. This covers all external and internal tubing and tubing connections. No simulator is required for this test.

In cases where the performance of the NiBP is in question or could have been compromised during repair the complete set of NiBP performance tests described in this service manual should be used (see test map, page 8, for guidance).

1. Attach an NiBP cuff (adult model 40401C is recommended) and the NiBP adapter cable to the monitor NiBP connector.

2. Wrap the cuff around itself and place on a table for the test, DO NOT place the cuff on your arm.

Performance Verification 19

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Hardware and Software Tests

3. Power on the monitor and enter the NiBP test screen.

a. Use the wheel to select Set up menu (screwdriver icon on bottom

of screen.)

b. Select the Power up defaults menu.

c. Use the wheel to select password 2-1-5.

Note

d. Select

e. Select NBP test.

4. Press the Heart Rate Tone VOLUME button to close valves.

5. Press NBP start/stop switch, hold until the monitor screen shows 250 mmHg.

6. Wait 15-20 seconds to allow the value to stabilize.

7. Note the value on the screen, start 1-minute timer.

8. After 1 minute note the value on the screen, if the difference is less than or equal to 6 mmHg the test has passed.

9. Press and hold the Heart Rate Tone VOLUME button until the screen shows the pressure has released and the value is 0 mmHg.

10. Turn the monitor off.

Enter Diagnostic Mode = yes.

If the test fails, ensure the integrity of the cuff and adapter tubing, then test again. If the test fails again, verify the integrity of all the pneumatic system tubing inside the monitor. If the test still does not pass, see test map, page 8.

Each of the tests mentioned below 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 indicates

Pressure Gauge.

and

2. Connect the simulator tubing to the NiBP connector on the monitor.

3. Follow the procedure described in Chapter 4 to place the monitor in Diagnostic Mode with the NiBP Test screen active.

Pressure Transducer

Accuracy

20 Performance Verification

The pressure transducer accuracy test verifies the pressure accuracy of the monitor’s pressure transducer.

Internal Cuff

Page 33

Hardware and Software Tests

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

Pressure Gauge.

2. Confirm that the simulator is set up for the internal cuff.

3. Confirm that the NiBP Test screen is active on the monitor.

• On the A1, press, then release, the Heart Rate Tone VOLUME button

to verify that the valve is closed.

• On the A3, press the ALARM SILENCE button to ensure that

both valves are closed.

4. Perform an offset adjustment so that the simulator and monitor both display a pressure of 0 mmHg by doing the following:

a. Press the CONTRAST button on the monitor.

b. Press the ZERO button on the simulator.

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

Pressure Source Set Test Pressure.

6. Use the UP/DOWN buttons on the simulator to adjust for a pressure of 250 mmHg.

7. Press the START PUMP button on the simulator. The simulator begins to pressurize. The current pressure in mmHg is displayed on both the simulator and the monitor displays.

8. Allow 15-20 seconds for the pressure to stabilize.

The pressure displayed on the monitor and the simulator should be within 5 mmHg of one another to complete the test successfully.

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

10. Press and hold the Heart Rate Tone VOLUME button until the monitor displays a pressure of 0 mmHg.

Additional NiBP tests can be performed at this time. If no further NiBP tests are to be conducted, turn the monitor off. Normal monitoring operation returns the next time the monitor is turned on.

Performance Verification 21

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Hardware and Software Tests

Pneumatic Leakage The pneumatic leakage test verifies the integrity of the pneumatic system.

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

Pressure Gauge.

2. Confirm that the simulator is set up for the internal cuff.

3. Ensure that the NiBP Test screen is active on the monitor.

4. Press the Heart Rate Tone VOLUME button on the monitor.

• On the A1, this verifies that the valve is closed.

• On the A3, this verifies that both the valves are closed.

5. Perform an offset adjustment so that the simulator and monitor both display a pressure of 0 mmHg by doing the following:

a. Press the CONTRAST button on the monitor.

b. Press the ZERO button on the simulator.

6. Press the NiBP button on the monitor to activate the pump.

7. Hold the NiBP button until the monitor displays a pressure of

approximately 250 mmHg.

8. Allow 15-20 seconds for the pressure to stabilize.

9. Record the pressure displayed on the monitor.

10. Start a 1 minute timer.

11. 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.

12. Press and hold the Heart Rate Tone VOLUME button until the monitor displays a pressure of 0 mmHg.

Additional NiBP tests can be performed at this time. If no further NiBP tests are to be conducted, turn the monitor off. Normal monitoring operation returns the next time the monitor is turned on.

22 Performance Verification

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Hardware and Software Tests

Inflation Rate The inflation rate test verifies the inflation rate of the monitor.

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

Pressure Gauge.

2. Confirm that the simulator is set up for the internal cuff.

3. Ensure that the NiBP Test screen is active on the monitor.

4. Press the Heart Rate Tone VOLUME button on the monitor.

• On the A1, this verifies that the valve is closed.

• On the A3, this verifies that both the valves are closed.

5. Perform an offset adjustment so that the simulator and monitor both display a pressure of 0 mmHg by doing the following:

a. Press the CONTRAST button on the monitor.

b. Press the ZERO button on the simulator.

1. Press the NiBP button on the monitor to activate the pump, and

simultaneously start the timer.

2. Hold the NiBP button until the monitor displays a pressure of 280

mmHg, then stop the timer.

The test is successfully completed if the inflation time is between 1 and 6 seconds.

3. Press and hold the Heart Rate Tone VOLUME button until the monitor displays a pressure of 0 mmHg.

Additional NiBP tests can be performed at this time. If no further NiBP tests are to be conducted, turn the monitor off. Normal monitoring operation returns the next time the monitor is turned on.

Over-Pressure The over-pressure test verifies the functionality of the over-pressure relief

system of the monitor.

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

Pressure Gauge.

2. Confirm that the simulator is set up for the internal cuff.

3. Ensure that the NiBP Test screen is active on the monitor.

4. Press the Heart Rate Tone VOLUME button on the monitor.

• On the A1, this verifies that the valve is closed.

• On the A3, this verifies that both the valves are closed.

5. Perform an offset adjustment so that the simulator and monitor both display a

Performance Verification 23

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Hardware and Software Tests

pressure of 0 mmHg by doing the following:

a. Press the CONTRAST button on the monitor.

b. Press the ZERO button on the simulator.

6. Press the NiBP button on the monitor to activate the pump.

7. Hold the NiBP button until the monitor displays a pressure of

approximately 250 mmHg.

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

Overpressure Test.

9. Press the START TEST button on the simulator. The simulator pressurizes the

system until the monitor’s overpressure relief system activates, including the warning display screen. The simulator displays the pressure value that caused the monitor’s overpressure relief system to activate. The test is successfully completed if the simulator displays a pressure reading of 280 mmHg to 330 mmHg.

10. Press and hold the Heart Rate Tone VOLUME button to ensure that the

monitor displays a pressure of 0 mmHg.

Additional NiBP tests can be performed at this time. If no further NiBP tests are to be conducted, turn the monitor off. Normal monitoring operation returns the next time the monitor is turned on.

Deflation Rate The deflation rate test verifies the deflation rate of the A3 monitor. (There is

no deflation rate test for the A1).

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

Pressure Gauge.

2. Confirm that the simulator is set up for the internal cuff.

3. Ensure that the NiBP Test screen is active on the monitor.

4. Press the Heart Rate Tone VOLUME button on the monitor. This verifies

that both the valves are closed.

5. Perform an offset adjustment so that the simulator and monitor both display a pressure of 0 mmHg by doing the following:

a. Press the CONTRAST button on the monitor.

b. Press the ZERO button on the simulator.

6. Press the NiBP button on the monitor to activate the pump.

24 Performance Verification

Page 37

Hardware and Software Tests

7. Hold the NiBP button until the monitor displays a pressure of

approximately 250 mmHg.

8. Start 1 minute timer, and simultaneously press and hold the ALARM SILENCE

button on the monitor.

This causes the pneumatic system to deflate at a rate of 3 mmHg/s ±1.5 mmHg/ s.

9. After 1 minute, record the pressure displayed on the monitor. The test has been successfully completed if the monitor displays a pressure reading of 10 mmHg to 190 mmHg.

10. Press and hold Heart Rate Tone VOLUME button until monitor displays a pressure of 0 mmHg.

Additional NIBP tests can be performed at this time. If no further NiBP tests are to be conducted, turn the monitor off. Normal monitoring operation returns the next time the monitor is turned on.

Operation with a Temperature Simulator (A1 only)

1. Remove the probe from its holder.

2. Insert the calibration key in the temperature input port T on the A1.

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.

Operation with a Temperature Simulator (A3 only)

1. With monitor off, connect the temperature cable (supplied with the temperature simulator) to the appropriate connector on temperature simulator.

2. Connect the temperature cable to the temperature input port on the A3.

3. Set the temperature simulator as follows:

Temperature: 37°C (98.6°F)

Probe Type: YSI 400 Series

Note

The accuracy of A3 temperature measurements is ±0.1°C (±0.2°F). In the procedure below, add the tolerance of the simulator to the acceptable range of readings.

Performance Verification 25

Page 38

General Operation

Serial Interface Test

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

5. After normal power-up sequence, verify temperature reads 37°C ±0.1°C (98.6°F ±0.2°F if Fahrenheit is selected as temperature units.)

6. Turn the monitor off.

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

• Serial Interface Test

• Printer Verification (for optional printer - A1 only)

Note Perform only if nurse call signal is used.

Perform the following procedure to test the serial port voltages. The test is 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 real panel, identified with the RS-232 symbol

1. Turn the monitor on.

2. Set up the DMM with the function set to

3. Connect the DMM negative lead to connector pin 5 (GND), or the shell of the RS-232 connector.

4. Referring to the following table, connect the DMM positive lead to each pin in turn, and verify the voltage values listed. Voltage for pin 9 is that listed for the

VDC at a range of 10 volts.

no alarm condition.

26 Performance Verification

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General Operation

Table 5 Serial Interface Voltages

Measurement (V)

Pin Signal Direction

Min. Typical Max.

1 not used 0.4 0.0 0.4

2 RXD<<< input –0.4 0.0 0.4

3 TXD>>> output –0.5 –9.0 –15.0

4 DTR>>> output –5.0 –9.0 –15.0

5 GND –0.4 0.0 0.4

6 DSR<<< input –0.4 0.0 0.4

7 RTS>>> output –5.0 –9.0 –15.0

8 CTS<<< input –0.4 0.0 0.4

9 Alarm Out>>>

(no alarm)

9 Alarm Out>>>

(alarm underway)

output –5.0 –9.0 –15.0

output 5.0 9.0 15.0

5. Connect the Nellcor Puritan Bennett SRC-2 pulse oximeter tester to the monitor via the M4787A sensor extension cable.

6. Set the SRC-2 switches as follows:

SWITCH POSITION

RATE 38

LIGHT LOW

MODULATION LOW

RCAL/MODE RCAL 63/LOCAL

7. Verify that the monitor is responding to the SpO

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 5. Voltage for pin 9 is that listed for the

alarm underway

condition.

Performance Verification 27

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General Operation

Printer Verification (For A1 Optional Printer M3925A)

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 on the rear of the printer. When the

printer’s external power supply is connected, the printer front-panel charging LED is lit.

2. Connect the serial cable between the labeled connectors on the

rear panels of the monitor and the printer.

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

4. Rotate the monitor wheel to highlight the setup icon . Press the wheel

and ensure Communications Selection is

Printer.

5. Connect a M4787A sensor extension cable to the monitor. Connect an oxygen transducer to the sensor extension cable. Attach it 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.

8. Press the printer CONTINUOUS button . Verify that the printout contains

vital signs across the top of the paper, and that a SpO

waveform, with grid

marks, occupies the center portion of the paper. To terminate the printout, press the CONTINUOUS button again.

9. Disconnect the sensor and shut off the monitor.

28 Performance Verification

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Safety Tests

Ground Integrity

Safety Tests

Philips safety tests meet the standards of, and are performed in accordance with IEC 601-1, Clause 19 (EN60601-1, Second Edition, 1988; Amendment 1, 1991-11, Amendment 2, 1995-03).

The A1 patient monitor is a Class II device. It is double insulated and does not require a protective earth (ground) wire. The A3 patient monitor is a Class I device. It requires a protective earth (ground) wire. Test requirements differ for Class I and Class II devices. Be aware of the differences and use the appropriate test procedure for the monitor in use.

There are two categories of safety tests:

n Ground Integrity

n Electrical Leakage

Table 6 Ground Integrity

Test or “Inspection” to Perform Expected Test Results

Protective Earth

See “Safety Test Diagram - Protective Earth” on page 30

With mains cable:

Maximum impedance = x <= 100 mOhms

Performance Verification 29

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Safety Tests

Safety Test Diagram - Protective Earth

Test or Inspection to Perform

Measures impedance of Protective Earth (PE) terminal to all exposed metal parts of IUT, which are for safety reasons connected to the Protective Earth (PE). Max. 100 mOhm. Test current 25 Amps applied for 5 to 10 seconds. We recommend to flex the main cable during the test in order to identify potential bad contact or damage of the earth wire. Safety test according to EN60601-1 (Clause 18). Report largest value.

Note The A1 does not require an isolated Earth Ground terminal,

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

30 Performance Verification

Page 43

Electrical Leakage

Safety Tests

The following tests verify the electrical leakage of the monitor:

n Earth Leakage Current (A3 only)

n Enclosure Leakage Current

n Patient Leakage Current

n Patient Source Current, with Mains Voltage on the Applied Part

Perform all leakage tests any time the unit is opened.

Earth Leakage Current

(A3 only)

This test is in compliance with IEC 601-1 (Earth Leakage Current). In locations where mains voltage is 100-120 volts, the applied voltage is 132 volts. In locations where mains voltage is 220-240 volts, the applied voltage is 264 volts. The applied AC frequency should be the same as the local mains (50 or 60 Hz).

All measurements shall be made with the power switch in both

ON and OFF

positions.

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

2. Perform test as recommended by analyzer operating instructions.

Earth leakage current is measured under various conditions of the AC mains and protective earth conductor. For each condition, the measured leakage current must not exceed that indicated below

Table 7 Earth Leakage Current Values (A3 Only).

Tes t

Condition

Normal

S.F.C

Open

Supply

Polarity Allowable Leakage Current

Normal 300 µA

Reversed 300 µA

Normal 1000 µA

Reversed

1000 µA

1. S.F.C = Single Fault Condition

Enclosure Leakage

Current

This test is compliance with EN60601-1 (Enclosure Leakage Current). Test at 110% of the nominal line voltage.

1. Connect the A3’s AC mains power cord to the analyzer as recommended by the analyzer operating instructions.

2. Using the appropriate test cable, connect the analyzer to the snap nearest to the handle fixing screw as shown in the following photograph.

Performance Verification 31

Page 44

Safety Tests

onnect analyzer test cable to the snap as arrowed

(or alternatively, to the handle fixing screw)

NOTE: do NOT use this snap on the rear of the case, or any of the other screws on the rear of the monitor

3. Turn the monitor on.

4. Perform the test as recommended by the analyzer operating instructions.

The analyzer leakage current indication must not exceed the values listed below.

32 Performance Verification

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Safety Tests

Table 8 Enclosure Leakage Current

EN60601-1 (1990 + A1, A2, A11, A12, A13) and UL2601 (2nd Ed. 1997) US Deviations

Test Condition Polarity Allowable Leakage Current

Patient Leakage

Current

Normal

S.F.C

Open Supply

(A1 Only)

Open

S.F.C

Protective Earth

(A3 Only)

Normal 100 µA

Reversed 100 µA

Normal 150 µA

Reversed 150 µA

Normal 300 µA

Reversed

300 µA

1. S.F.C = Single Fault Condition

This test measures patient leakage current in accordance with EN60601-1, Clause 19, for Class I, type CF equipment. Patient leakage current in this test is measured from any individual patient connection to earth (power ground).

This test requires a sample patient cable for each device parameter. These must be configured as recommended by the safety analyzer operating instructions.

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

2. • A1 - 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.

• A3 - Connect the monitor’s AC mains power cord to the analyzer as

recommended by analyzer operating instructions.

3. Connect the ECG test cable between the ECG connector on the monitor

and the appropriate input connector on the analyzer.

4. Turn the monitor on.

5. Perform the test as recommended by the analyzer operating instructions.

Patient leakage current is measured under various conditions of the AC mains and protective earth conductor. For each condition, the measured leakage current must not exceed that indicated below.

6. Repeat the test for SpO

and temperature patient connections, using appropriate

test cables.

Performance Verification 33

Page 46

Safety Tests

Table 9 Patient Leakage Current Values

Test Condition Polarity

Allowable Leakage

Current (Max.)

Typ e CF

Normal

S.F.C.

(Open Supply)

(A1 Only)

(Open Earth/Ground)

(A3 Only)

Normal 10 µA

Reversed 10 µA

Normal 50 µA

Reversed 50 µA

Normal 50 µA

Reversed 50 µA

1. S.F.C. = Single Fault Condition

Patient Leakage

Current, with Mains

Voltage on the Applied

Part

This test measures patient leakage current in accordance with EN60601-1, Clause 19, for Class I, 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.

Warning AC mains voltage is present on the applied part terminals

during this test. Exercise caution to avoid electrical shock hazard.

Table 10 Safety Tests - Patient Leakage Current, with Mains

Voltage on the Applied Part

Test or “Inspection” to Perform Expected Test Results

Patient Leakage Current - AC

See “Safety Test Diagram - Patient Leakage Current - AC” on page 35

34 Performance Verification

Maximum leakage current = x

<= 50 mA @ 250V (IEC601-1 or UL2601-1)

Test at 110% of the nominal line voltage.

Page 47

Safety Test Diagram - Patient Leakage Current - AC

Test or Inspection to Perform

Safety Tests

Measures patient leakage current from Applied Part to earth caused by external mains voltage on Applied Part with switch S5 open and closed. Each polarity combination possible is tested using S2 and S6.

Safety test according to EN60601-1 (Clause 19.4.h). Report largest value.

Performance Verification 35

Page 48

Safety Tests

36 Performance Verification

Page 49

Power-up Defaults Menu And Diagnostic

Mode

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.

Power-up Defaults Menu

The purpose of the Power-up Defaults Menu is to allow the authorized user to create a power-up default for each setting in the monitor. Power-up defaults are the settings in effect each time the monitor 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.

Note

Use the following procedure to configure the power-up default settings for the monitor:

1. Set the monitor to normal monitoring mode.

2. Adjust each accessible setting on the monitor as desired.

Use the techniques described in the User Guide. Such settings include alarm limits, choice of display type for the graphic frames, and ECG lead select.

3. Use the wheel to invoke the Set-up Menu (choose the screwdriver icon

found along the bottom of the display).

4. Select menu item

selected, a pop-up box will appear with the text

Passcode.

5. Use the wheel to enter the passcode,

Enter Power-Up Defaults Menu. Once

Enter 3-Digit

2 1 5.

Note

Power-up Defaults Menu And Diagnostic Mode 37

This passcode is set at the factory and cannot be changed.

6. The Power-up Defaults Menu is now present. The available menu items are explained below. Make changes to these menu items as desired.

Page 50

Power-up Defaults Menu

Menu Item* Choices** Explanation

Accept Current Settings as Power-Up Defaults?

Adult/Neonatal Mode (A3 only)

Alarm Silence Period 30 s, 60 s,

Permanent Audible Alarm Silent

Yes

90 s, 120 s

Make Available

Deny Access

If Yes is chosen, the current monitor settings become the power-up defaults.

Neonatal mode is not available at this time; thus, when this item is selected, the following pop-up message will appear:

Selection not available.

Time is indicated in seconds. Pressing the front-panel Alarm Silence button temporarily silences audible alarms for the time indicated in the Silence Period menu item. Alarm state(s) in effect at the end of the pre-set interval cause the audible alarm to sound. Pressing the Alarm Silence button a second time (while the silence interval is still in effect) ends the interval immediately. Silencing audible alarms does not affect visual alarm indications.

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.

Alarm Suspend Make Available

Deny Access

Auto-Set Limits Make Available

Deny Access

SpotCheck Mode

(A1 only)

Deny Access

Make Available

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.

If Make Available is chosen, the caregiver will invoke the SpotCheck Mode as one of four choices available through the Display icon in the Menu Frame. The factory default is to Deny Access, allowing only three choices available through the Display icon in the Menu Frame.

38 Power-up Defaults Menu And Diagnostic Mode

Page 51

Power-up Defaults Menu

Menu Item* Choices** Explanation

Language*** English

French

German

Italian

Japanese

Portuguese

Spanish

Russian

Chinese

Enter Diagnostic Mode

Done When selected, the Power-up Defaults

Yes

Dutch

Turkish

Arabic

Norwegian

Swedish

Finnish

Polish

Czech

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.

Note: Language selection screen upon

boot up can be reactivated by following the steps listed in the section Restoring Factory Settings.

If Yes is chosen, the Power-up Defaults Menu is exited and the Diagnostic Menu appears.

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.

*** Although the language choices are shown here in English, they appear in their own respective language and

script on the Boot Up Screen and in the Power-up Defaults Menu.

7. After making any desired changes to the menu items, choose the menu item Accept

current setting?

8. Select YES.

9. Select

Done.

Upon selecting Done, a Notice Screen appears, with the directions that the monitor must be powered off, and that any changes made to the power-up defaults are in effect the next time the unit is powered up.

Power-up Defaults Menu And Diagnostic Mode 39

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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 monitor performance or troubleshooting problems.

To access the Diagnostic Mode:

1. Invoke the Power-up Defaults Menu. (See “Power-up Defaults Menu” on page 37.).

2. Select the menu item,

3. Choose

Yes. The Power-up Defaults Menu is exited and the Diagnostic menu appears.

Enter Diagnostic Mode.

DIAGNOSTIC

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 invokes that test or information screen. The test and information screens that appear in the Diagnostic menu are as follows:

n Error Codes

n System Information

n System A/D Values

n NiBP Test

n Return

Error Codes

This screen displays the 10 most recent error code types, logged by the monitor. After 10 error code types have been logged, the oldest error code type is deleted as new error code types are added. Adjacent to each error code is 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

40 Power-up Defaults Menu And Diagnostic Mode

Page 53

error code. Error codes cannot be changed or reset in this screen. When in the Error Code screen, the user to the Diagnostic Menu. Rotating the wheel while in the Error Code screen has no effect.

Refer to “Error Codes”, Chapter 5, for more detail on error codes.

System Information

Monitor On-Time 1563

Backlight On-Time 871

Diagnostic Mode

Return item is always highlighted; a press of the wheel returns the

SYSTEM INFORMATION

Recorder On-Time

Battery Deep Discharges 152

System Software Version V1.02

SpO2 Software Version V1.2.0

Return

1. A3 only

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 cannot be reset.

Note The 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 is reset to zero.

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

• Recorder On-time: Displays the number of hours, rounded to the nearest hour, that the A3 Recorder has been

Power-up Defaults Menu And Diagnostic Mode 41

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Diagnostic Mode

operational. This value can be reset to zero, for instance at the time when a technician installs a new recorder.

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

5.6 volts, the voltage at which a

Low Battery

alarm is issued. This value can be reset to zero, for instance at the time when a technician installs a new battery.

• System Software Version: Displays the revision level of the system software. The revision level is also momentarily shown on the LCD as part of the Copyright screen. This value cannot be changed by the user.

•

SpO2 Software Version: Displays the revision level of the software of the

MP-205 SpO

module. This value cannot be

changed by the user.

When in the System Information screen, the wheel can be rotated to select any of the changeable items. If one of those items is selected, a press of the wheel causes a popup menu to appear. The first item in the pop-up reads second item in the pop-up reads

Reset to zero. Exiting the screen is

accomplished in the normal manner, by selecting

Make no change; the

Return.

System A/D Values

The System A/D 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 are constantly changing when an input signal is present. These AC-coupled values are shown to give an indication as to whether basic functionality of the channel is present, but no significance can be derived from the values of the numbers displayed. However, others of the A/D channels read DC voltages, (for example, power supply voltages and battery voltage) and those voltage values directly provide useful diagnostic information.

The Primary and Secondary Status messages from the SpO updated at the rate of about once per second. Presence of the correct SpO indicates that, at a basic level, communication between the SpO monitor processor is working correctly. None of the displayed values can be changed

or reset in this screen.When in the System A/D screen, the Return item is always highlighted; a press of the wheel returns the user to the Diagnostic Menu. Rotating the wheel while in the System A/D screen has no effect. The A/D channel designators are shown below.

module are displayed and

message

module and the main

42 Power-up Defaults Menu And Diagnostic Mode

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Diagnostic Mode

A/D Channel Designators

A1 A3

1. ECG 1. ECG

2. RWAVE 2. RWAVE

3. PACEMAKER 3. PACEMAKER

4. TEMP 1 (93° TO 112°) 4. RESPIRATION

5. PRESSURE XDUCER 1 5. PRESSURE XDUCER 1

6. PRESSURE XDUCER 2 6. PRESSURE XDUCER 2

7. NiBP OSCILLATORY 7. NiBP OSCILLATORY

8. ECG LEAD OFF 8. ECG LEAD OFF

9. TEMP 2 (59° TO 93°) 9. TEMPERATURE

10. ISOLATED VOLTAGE REF 10. ISOLATED VOLTAGE REF

11. ISOLATED VOLTAGE ZERO 11. ISOLATED VOLTAGE ZERO

2 S1 S018 SpO2 S1 S018

SpO

12. (BATTERY VOLTAGE) X 0.5 12. (BATTERY VOLTAGE) X 0.5

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

14. +3.3 VDC POWER SUPPLY 14. +3.3 VDC POWER SUPPLY

15. (NiBP VOLTAGE REF) X 0.5 15. (+12 VDC POWER SUPPLY) X

16. GROUND REFERENCE 16. (NiBP VOLTAGE REF) X 0.8

17. (+5 VDC POWER SUPPLY) X 0.5 17. GROUND REFERENCE

18. ADC MID-SCALE VALUE 18. (+5 VDC POWER SUPPLY) X 0.8

19. ADC ZERO-SCALE VALUE 19. ADC MID-SCALE VALUE

20. ADC FULL-SCALE VALUE 20. ADC ZERO-SCALE VALUE

13. NOT USED

0.33

21. ADC FULL-SCALE VALUE

NIBP Test

Warning A blood pressure cuff, connected to the monitor, should never be

applied to a human subject while the monitor is in Diagnostic Mode. Injury could result.

Power-up Defaults Menu And Diagnostic Mode 43

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Diagnostic Mode

NiBP TEST

Pressure (mmHg) 179

Valve: OPEN

Press

NiBP to activate pump;

release to stop pump.

Volume to open valve;

Press release to close valve.

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

Contrast to perform offset

Press

adjust.

Return

An NiBP Test screen is provided to facilitate troubleshooting problems and performing verification testing for the NiBP subsystem. Typically, when these tests are performed, the pneumatic system is connected to an external pressure-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 valves, and a display indicating whether the proportional and safety valves are 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.

• Proportional Valve The display indicates whether the

Display: proportional valve is open or closed.

• Safety Valve Display: The display indicates whether the safety valve is open or closed.

• Activate Pump: For as long as the NiBP Start/Stop button

is pressed, the pump runs. If system pressure reaches the hardware over-pressure protection point (280 to 330 mmHg), the safety valve opens and the pump disables, until the pressure falls below the safety threshold.

• Deflate: For as long as the

44 Power-up Defaults Menu And Diagnostic Mode

ALARM SILENCE button

Page 57

Restoring Factory Settings

is pressed, the proportional valve opens

and bleeds off pressure at the rate of 3 ±1.5 mmHg/ s. It is useful to control the bleed rate to 3 mmHg/ second to facilitate certain AAMI SP10 tests. Any time the bleed rate falls below 3 mmHg/second, the valve opens and remains at maximum as long as the button is pressed.

• Open Valve (A1): While the Heart Rate Tone

is pressed, the valve opens and remains at maximum as long as the button is pressed.

• Open Both Valves (A3): For as long as the Heart Rate Tone

button is pressed, the safety valve and

proportional valve opens and remains at maximum as long as the button is pressed.

• Offset Adjust: A momentary press of the

button invokes the

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 display as

When in the NiBP Test screen, the wheel returns the user to the Diagnostic Menu. Rotating the wheel while in the NiBP Test screen has no effect.

Return item is always highlighted; a press of the

VOLUME button

VOLUME

CONTRAST ADJUST

zero calibration

zero.

Restoring Factory Settings

Caution In addition to restoring factory defaults, this procedure clears the

contents of trend memory.

Note Read this procedure completely before performing the first step.

The following technique can be used to restore the monitor’s power-up default

Power-up Defaults Menu And Diagnostic Mode 45

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Restoring Factory Settings

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-

3. Continue to keep the VOLUME and CONTRAST buttons depressed until

CONTRAST buttons on the front keypad.

up the monitor.

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

46 Power-up Defaults Menu And Diagnostic Mode

Page 59

Introduction

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

How To Use This Section

Use this section in conjunction with Chapter 3, “Performance Verification”, and Chapter 7, “Spare Parts”. To remove and replace a part you suspect is defective, follow the instructions in Chapter 6, “Disassembly Guide”. The Circuit Analysis chapter in the Concepts Guide offers information on how the monitor functions.

Troubleshooting

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 Philips’ Response Center or your local Philips representative.

Replacement Level Supported

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

Chapter 5 - Troubleshooting 47

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Obtaining Replacement Parts

Philips’ Response Center provides technical assistance information and replacement parts. To obtain replacement parts, contact your local Philips representative. Refer to parts by the part names and part numbers listed in Chapter 7, “Spare Parts”.

Troubleshooting Guide

Problems with the monitor are separated into the categories indicated below. Refer to the section indicated for further troubleshooting instructions.

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 Philips’ Response Center or your local representative.

Power

Problem Area Refer To:

1. Power

• No power-up

• Fails power-on self-test

• Powers down without apparent cause

2. Error Messages “Error Codes” on page 51

3. Buttons/Wheel

• Monitor does not respond properly to buttons

4. Display/Audible Tones

• Display does not respond properly

• Tones do not sound properly

5. Operational Performance

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

• Suspect readings

• Recorder not responding

“Power” on page 48

“Buttons/Wheels (All Monitors)” on page 56

“Display/Audible Tones (All Monitors)” on page 57

“Operational Performance” on page 58

All categories listed above are discussed in the following sections.

The following table lists recommended actions to address A1 power

48 Chapter 5 - Troubleshooting

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problems.

Condition Recommended Action

Troubleshooting Guide

1. With external power supply connected the green

EXTERNAL POWER indicator

on the front panel is not lit.

2. The A1 fails to power-up when the

ON/STANDBY

button is pressed…with the monitor connected to external power supply.

1. Ensure that the external power supply input (PS-120V or PS-240V) is plugged into an operational AC outlet of 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 does 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.

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.

3. The A1 fails to power-up when the

ON/STANDBY

button is pressed with the monitor not connected to external power supply.

Chapter 5 - Troubleshooting 49

1. First, follow the steps described in Condition 2, above, to ensure that the monitor operates 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 “Battery Charge” on page 11. If the battery fails to hold a charge, replace the battery.

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

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Troubleshooting Guide

Condition Recommended Action

4. The A1 turns on, then shuts off and sounds an alarm and no error code is displayed.

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 could be discharged, or the battery fuse could be blown.

2. Recharge the battery as directed in “Battery Charge” on page 11. 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.

4. If problem persists, replace the main PCB.

The following table lists recommended actions to address A3 power problems.

Condition Recommended Action

1. The A3 fails to power-up when the

ON/STANDBY

button is pressed.

1. Ensure power cord is plugged into operational AC outlet of appropriate voltage and frequency. Ensure green BATTERY CHARGING/AC SOURCE indicator is lit. If indicator is not lit, replace power supply assembly.

2. Check fuses located on power supply assembly above AC inlet receptacle. Replace fuses if necessary.

3. Inside monitor, check main ribbon cable and ensure that it is connected to main PCB and power supply assembly.

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

5. If the problem persists, replace main PCB.

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Troubleshooting Guide

Condition Recommended Action

Error Codes

2. The A3 turns on, then shuts off and sounds an alarm and no error code is displayed.

1. Press Alarm Silence switch to terminate audible alarm. Ensure AC power cord is connected and green BATTERY CHARGING/AC SOURCE indicator is lit, or ensure DC source is connected and green BATTERY CHARGING/DC SOURCE is lit. If monitor operates successfully, battery can be discharged.

2. Recharge the battery as directed in “Battery Charge” on page 11. If the battery fails to hold a charge, replace the battery.

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

4. If the problem persists, replace the power supply assembly.

When the monitor 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 also sounds. 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 can 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 Chapter 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 A1 provides the capability for technicians to print out a copy of the error log.

Generating an Error Log Printout (A1 only)

1. Connect the recorder to the monitor, and its power supply to an appropriate source. Refer to the operator’s manual.

2. Use the Recorder mode is the selected option for the Communications Selection

item. (It is the factory-set default value.)

3. Turn monitor power OFF.

Chapter 5 - Troubleshooting 51

SETUP button and displayed menu to verify that the

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Troubleshooting Guide

4. Simultaneously press the CONTRAST button and the ON/

STANDBY

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 the section titled, “Serviceable Hardware Error Codes” for additional information on these codes.

Serviceable Hardware Error Codes

Serviceable Hardware

Error Codes for A1

Listed below are error codes for the A1 that correspond to hardware problems, and the recommended actions to take should such an error be encountered.

Hex Code Explanation Recommended Action

1 Improper shutdown. 1. Cycle power.

2 NiBP Sensor Error.

button to power up the monitor. Keep the contrast

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

1. Check for blocked tubing in

• The two pressure system. transducers do not agree.

the pneumatic system.

2. Replace Main PCB.

3 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.

4 The measured value of the 3.3V

power supply is low.

5 The measured value of the 3.3V

power supply is high.

7 The measured value of the 12V

power supply is high.

8 The measured value of the 5V

power supply is low.

9 The measured value of the 5V

power supply is high.

52 Chapter 5 - Troubleshooting

1. Cycle power.

2. Check for blocked tubing in the pneumatic system.

3. 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.

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Troubleshooting Guide

Hex Code Explanation Recommended Action

A The measured value of the

isolated reference supply on the front end is low.

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.

E A checksum error is detected on

the power-up settings region of Flash memory.

64 The SpO

error message to the host CPU.

module is sending an

1. Check power supply.

2. Replace Main PCB.

1. Check power supply.

2. Replace Main PCB.

1. Cycle power.

2. If error persists, replace main PCB.

1. Turn Power Off.

2. Turn power back on while pressing both the CONTRAST and VOLUME buttons. See “Restoring Factory Settings” on page 45, Chapter 4.

3. All user selections must be restored.

4. If error persists, replace Main PCB.

1. Cycle power.

2. If problem persists, replace Main PCB.

Serviceable Hardware

Error Codes for A3

65 The SpO

communicating with the host CPU.

module is not

1. Cycle power.

2. If problem persists, replace main PCB.

IListed below are error codes for the A3 that correspond to hardware problems, and the recommended actions to take should such an error be encountered.

Hex Code Explanation Recommended Action

2 NiBP Sensor Error.

Improper shutdown. 1.Cycle power.

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

1. Check for blocked tubing in

• The two pressure system. transducers do not agree.

the pneumatic system.

2. Replace Main PCB.

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Troubleshooting Guide

Hex Code Explanation Recommended Action

3 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.

• NiBP system has released pressure using safety valve.

4 The measured value of the 3.3V

power supply is low.

5 The measured value of the 3.3V

power supply is high.

6 The measured value of the 12V

power supply is low.

7 The measured value of the 12V

power supply is high.

1. Cycle power.

2. Check for blocked tubing in the pneumatic system.

3. Replace Main PCB.

Note: This error may occur

during a blood pressure measurement in STAT mode, if the leg cuff is used.

1. Check power supply.

2. Replace power supply assembly.

1. Check power supply.

2. Replace power supply assembly.

1. Check power supply.

2. Replace power supply assembly.

1. Check power supply.

2. Replace power supply assembly.

8 The measured value of the 5V

power supply is low.

9 The measured value of the 5V

power supply is high.

A The measured value of the

isolated reference supply on the front end is low.

B The measured value of the

isolated reference supply on the front end is high.

C The measured value of the

isolated reference supply on the front end is high.

64 The SpO

module is sending an

error message to the host CPU.

1. Check power supply.

2. Replace power supply assembly.

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. Ensure MP-205 module is properly connected.

2. Replace MP-205 module.

3. If problem persists, replace Main PCB.

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Troubleshooting Guide

Hex Code Explanation Recommended Action

65, 66 MP-205 SpO2 module has

6E-71 MP-205 SpO

Other Error Codes (All Monitors)

If an error code occurs that is not listed in “Serviceable Hardware Error Codes”, 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 Philips’ Response Center or your local Philips 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 Philips’ Response Center or your local Philips representative for advice on remedial action.

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

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

detected an error during initialization.

module has

detected an error on its serial port.

1. Replace MP-205 module.

2. If problem persists, replace Main PCB.

1. Replace MP-205 module.

2. If problem persists, replace Main PCB.

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

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Troubleshooting Guide

Code (hex) Explanation

508xxxx trend error

509xxxx flash memory data error

50axxxx SpO

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 (A1 only)

Buttons/Wheels (All Monitors)

The following lists recommended actions to address problems with the wheel and front-panel buttons.

error

Condition Recommended Action

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

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

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

56 Chapter 5 - Troubleshooting

1. Take steps as noted in “Power” on page 48.

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.

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Display/Audible Tones (All Monitors)

The following lists recommended actions to address problems with the display and audible tones.

Condition Recommended Action

Troubleshooting Guide

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.

2. Monitor responds to button press, but key press tone fails to sound.

Note: Pressing the A3 contrast adjust switch

causes the LCD contrast setting to immediately change to normal, factorydefault value. Pressing the A3 contrast adjust switch toggles the display between the two different color schemes (black background and white background).

1. A1 and A3: Adjust the LCD screen contrast by pressing the CONTRAST button momentarily, then turning the wheel four revolutions in each direction. Turning the wheel clockwise should brighten the screen; turning the wheel counterclockwise should darken the screen.

2. A3: Ensure red LED, located on the top left corner of the Main PCB, is illuminated. If the LED is not illuminated, the monitor is not in on state: follow troubleshooting steps in “Power” on page 48.

3. Ensure that the backlight cable is connected to the Main PCB.

4. Ensure that the LCD connector is properly connected to the Main PCB and LCD PCB.

5. If problem persists, replace Main PCB.

6. A3: If problem persists, replace backlight PCB.

7. If problem persists, replace LCD assembly.

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.

3. Audible alarm does not sound.

Chapter 5 - Troubleshooting 57

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.

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Troubleshooting Guide

Operational Performance

Operational

Performance

Problems - A1

Operational

Performance

Problems - A3

The following lists recommended actions to address problems related to operational performance of the A1.

Condition Recommended Action

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

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

2. Ensure that the Patient Connector PCB is properly connected to the Main PCB. Ensure that the tubing 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.

The following lists recommended actions to address problems related to operational performance of the A3.

Condition Recommended Action

1. Monitor appears to be operational, but physiological values are suspect or nonexistent.

2. Recorder paper will not advance.

1. Replace each patient cable (or tubing) with a known serviceable cable.

2. Ensure internal ECG, temperature, and SpO2 cables are connected to Main PCB. Ensure tubing in pneumatic system are properly connected, and NiBP pump motor is connected to power supply PCB.

3. If problem persists, replace main PCB.

1. Open recorder door and check paper is present. Press recorder module firmly into monitor to ensure recorder module is fully engaged with connector on recorder PCB.

2. Cycle power on monitor. Recorder should execute a line feed at conclusion of power-up sequence.

3. If problem persists, ensure main ribbon cable is connected to printer PCB, power supply and Main PCB.

4. If problem persists, replace recorder.

5. If problem persists, replace recorder PCB.

6. If problem persists, replace Main PCB.

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Troubleshooting Guide

Condition Recommended Action

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

1. Open recorder door and check paper is oriented correctly; paper should exit from bottom of roll. See User Guide for an illustration of correct paper orientation.

2. If problem persists, replace recorder.

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Troubleshooting Guide

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Disassembly Guide

Warning Performance verification: do not place the monitor into

operation after repair or maintenance has been performed, until all recommended Performance Tests and Safety Tests listed in Chapter 3 of this service manual have been performed. Failure to perform all tests could result in erroneous monitor readings.

Introduction

The monitor can be disassembled down to all major component parts, including:

• PCBs

•battery

•cables

• function buttons

• chassis enclosures

The following tools are required:

• small/medium, Phillips-head screwdriver

• needle-nose pliers

• 9/16-inch socket (for wheel encoder)

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

Warning Before attempting to open or disassemble the monitor,

disconnect the power supply from the monitor.

Warning High voltage is generated by the LCD backlight driver.

Exercise caution when operating the monitor with the covers open.

Caution Observe ESD (electrostatic discharge) precautions when

working within the unit.

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How To Use This Chapter

Caution If the internal battery cable has been disconnected, pay

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

How To Use This Chapter

The step-by-step procedures that are used to access replaceable parts of the monitor are illustrated in the Disassembly sections which follow. These describe and photographically illustrate procedures for disassembling the monitor to enable removal and replacement of suspected defective assemblies/components.

The monitor consists of two main assemblies, the front case assembly, and the rear case assembly. The main PCB assembly is separable from the front case assembly.

All part numbers and exploded views of some assemblies are found in Chapter 7, “Spare Parts”.

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Disassembly Procedures (A1)

Closed Case Disassembly Procedures

This section describes the items that can be removed without disassembling the main case of the A1 monitor.

Procedure to remove the battery from Models M3921A and M3923A when a temperature module is not installed:

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

Disassembly Procedures (A1)

Battery pad

2. Remove the battery cover.

3. Disconnect the spade terminal connectors from the battery terminals.

Caution During reassembly, pay particular attention to the polarity

of the battery cable before reattaching. The polarity is marked on the circuit board. Red connects to the +ve terminal, black connects to the –ve terminal. If battery cable polarity is reversed, it is likely that circuit damage will occur.

4. Remove the battery.

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Disassembly Procedures (A1)

5. As required, remove the battery cushions on the inside of the battery compartment, and the battery cover.

Foot cushions

Battery cover

Procedure to remove the battery from the monitor when a temperature module is installed:

For models with temperature module

Te mp module

1. Use a Phillips-head screwdriver to remove the two screws fastening the temperature module housing to the rear case assembly. The same screws also hold the battery cover.

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Disassembly Procedures (A1)

2. Remove the temperature module housing and the battery cover.

Battery cover

Removed temperature module housing

3. The probe sensor contact switch is mounted on the outer side of the battery cover. As required, disconnect the leads from the probe sensor switch to the rear panel connector.

4. Remove the switch.

Temperature probe grommet

Probe sensor switch

Spare probe sensor switch

5. Disconnect the spade terminal connectors from the battery terminals.

Caution During reassembly, pay particular attention to the polarity

6. Remove the battery.

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

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Disassembly Procedures (A1)

compartment, and the battery cover.

Battery cover

Separation of Front and Rear Case Assemblies

This section describes the procedures required to separate the front and rear case assemblies of the A1 monitor.

Foot cushions

Procedure to separate the front and rear case assemblies:

1. Remove the SpO

connector hood by squeezing the sides to release the

detents holding the hood in place. During reassembly, the notch on the SpO

connector hood should be

facing down.

SpO

connector hood

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

3. Separate the main front and rear case assemblies.

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

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Rear case assembly

Disassembly Procedures (A1)

Front case assembly

During reassembly, align the ridge in the front case assembly with the groove in rear case assembly. The gasket snake break should be placed at the bottom of the unit. Line up the connector panel with the slots in the rear case, making sure speaker wire is out of the way. Power up the monitor prior to installing the final four screws. If the monitor boots properly, insert the four screws and proceed to the performance tests.

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

Ribbon cable and connector

6. 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.

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Disassembly Procedures (A1)

Caution During reassembly, pay particular attention to the polarity

7. Unscrew the NiBP Luer connector.

During reassembly, preload the NBP Luer connector by twisting the silicone NBP tubing in opposite directions prior to making the Luer connection. This prevents disconnection.

Front and rear case assemblies are now completely separate from one another.

Luer connector to NiBP pump tubing

Front Case Disassembly Procedures

This section describes how to remove/replace items from the front case assembly. First separate the front and rear assemblies as described in the section “Separation of Front and Rear Case Assemblies” on page 78.

Procedure to remove the main PCB assembly from the front case assembly:

1. Use a Phillips-head screwdriver to remove the screw 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.

Battery cable

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Disassembly Procedures (A1)

2. Remove the board by gently pulling to disconnect from LED connector. Pull straight back to avoid bending the pins.

During reassembly, line up the LED connector when replacing the main PCB in the front case assembly, press gently into position, and feed the ribbon cable through the hole for the wheel.

3. Disconnect the backlight, keypad, speaker connector, and wheel ribbon connector.

During reassembly, tuck the speaker cable out of the way.

There are now three separate items:

• Front case assembly

• Rear case assembly

• Main PCB assembly

Main PCB assembly

Rear case assembly

Front case assembly

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Disassembly Procedures (A1)

Procedure to remove the display:

Caution Perform this step in a dust-free environment to avoid

damage to the LCD display.

1. Use a Phillips-head screwdriver to unfasten the four corner screws. These screws also hold the LCD assembly in place.

2. Remove the display shield.

Backlight connector

Speaker connector

Keypad cable and connector

Wheel encoder assembly

3. Remove the LCD assembly, providing access to the display window.

4. Remove the display window by carefully prying up one corner and then peeling back.

PCB

LCD assembly

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Disassembly Procedures (A1)

Procedure to remove the speaker:

1. Remove the retaining spring clip.

2. Remove the speaker.

3. Orient the speaker wires towards the handle (as shown in the photograph).

Handle

Spare speaker, leads attached

Procedure to remove the wheel and encoder:

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

If the wheel is not easily removable by hand, a small flat-headed screwdriver can be used to gently pry off the wheel. If necessary, apply some adhesive tape to the front cover and the head of the screwdriver to prevent any damage.

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

During reassembly, orient the ribbon connector so that the cable lies parallel to the bottom of the board and pin 1 is oriented close to the handle.

Nut

Spare wheel

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Encoder assembly

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Disassembly Procedures (A1)

Procedure to remove the keypad:

The keypad is attached with an adhesive to the front panel.

1. From the front side of the panel, carefully pry up one corner of the keypad from the cover, and then peel it away from the cover.

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

Spare wheel

Keypad, integral cable and connector

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Rear Case Disassembly Procedures

This section describes the items that can be removed or replaced on the rear case assembly of the A1 monitor. First separate the front and rear assemblies as described in the section “Separation of Front and Rear Case Assemblies” on page 78.

Procedure to remove a rear connector PCB:

1. Use a Phillips-head screwdriver to remove the two screws holding the rear connector PCB to the rear cover.

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

3. From inside the rear cover, remove the rear connector PCB assembly.

NiBP pump, tubing and lead attached

Disassembly Procedures (A1)

Rear connector board assembly

Procedure to remove NIBP pump:

1. Use a Phillips-head screwdriver to unfasten the screw holding the clamp to the rear cover.

2. Disconnect the power lead from the rear connector PCB.

3. Remove the clamp and the pump.

NiBP pump

Pump power lead

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Disassembly Procedures (A1)

Procedure to remove handle and foot cushions:

Each end of the handle is friction-fit onto a cross-shaped boss.

1. Use flat-bladed screwdriver to carefully pry one end of the handle.

2. 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.

3. Alternately apply this prying action between each end of the handle until the handle is free of the rear case.

4. The 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.

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Main PCB Disassembly Procedures

This section describes the items that can be removed or replaced from the main PCB assembly of the A1 monitor. The main PCB assembly is separable from the front case assembly.

First separate the front and rear assemblies as described in the section “Separation of Front and Rear Case Assemblies” on page 66.

Then perform “Procedure to remove the main PCB assembly from the front case assembly”, page 68.

Procedure to remove NiBP pneumatic assembly from the main PCB assembly:

1. Pull the tubing from the barbed fitting on the rear of the NiBP panel connector.

2. Pull the tubing from the fittings on the the pressure sensors and valve.

Disassembly Procedures (A1)

NiBP pneumatic assembly

group Pressure sensor

Procedure to separate the patient connector PCB assembly from the main PCB assembly:

1. Use needle-nose pliers or a Tinnerman tool to remove the two Tinnerman fasteners securing the patient connector PCB assembly to the underside of the main PCB.

2. Disconnect the patient connector PCB assembly by pulling it straight up from the main PCB.

3. The battery fuse F301, located near the battery cable connector on the main PCB can be replaced if necessary. (The battery fuse is located between the two round yellow poly fuses).

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Disassembly Procedures (A1)

Patient connector PCB assembly

Main PCB assembly

Foot of moulded connector panel after removal of Tinnerman nut

Procedure to separate the patient connector PCB from the connector panel:

1. Use a Phillips-head screwdriver to remove four screws fastening the two assemblies together.

Two of the screws are accessible on the face of the connector PCB, two are accessible through access holes in the PCB.

2. Separate the two assemblies.

Connector panel

Patient connector PCB

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Disassembly Procedures (A3)

Closed Case Disassembly Procedures

This section describes the items that can be removed without disassembling the main case of the A3 monitor.

Procedure to remove front panel wheel:

The wheel is friction-fit on the encoder shaft.

1. Grasp the sides of wheel firmly and pull straight back from the monitor. The wheel should slip off the encoder shaft.

2. If wheel does not move, separate front and rear cases as described in “Separation of Front and Rear Case Assemblies” on page 78. There is a hole in the front cover behind the wheel. Insert a small screwdriver blade in the hole and push firmly against the back of the wheel.

Disassembly Procedures (A3)

Procedure to remove carrying handle:

1. Use screwdriver to remove the two fastening screws and washers. Retain them for reassembly.

2. Remove the handle by sliding it straight back towards the rear of the monitor.

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Procedure to remove recorder:

1. Press the

Paper Eject button on the right side of the recorder. The door

drops forward.

2. Remove the paper roll, if installed. Two fastening screws are visible on the back panel of the recorder.

3. Use a screwdriver to back out the captive fastening screws.

4. Pull the recorder straight out of the side of the monitor, disengaging the connector at the rear of the module from the recorder PCB in the assembly.

Note that removal of the recorder PCB can be accomplished only after the front and rear cases are separated.

Separation of Front and Rear Case Assemblies

Procedure to separate front and rear case assemblies:

1. Remove handle as indicated in procedure on page 77.

2. Use screwdriver to remove four screws fastening Rear Case Assembly to Front Case Assembly to Front Case Assembly. Retain for reassembly.

Note that the gasket must be inserted around the top of the rear case before reassembly.

3. Separate the two major case assemblies. There is enough cable and tubing slack to permit the two assemblies to remain at an angle of approximately 90 degrees to each other.

During reassembly, preload the NBP Luer connector by twisting the silicone NBP tubing in opposite directions prior to making the Luer connection. This prevents disconnection.

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Disassembly Procedures (A3)

Main ribbon cable assembly

NiBP tubing

Connector to recorder PCB (when installed)

4. Disconnect the large ribbon-cable connector from the main PCB.

5. Unscrew the NiBP tubing connector from the pump to the main PCB. The front and rear case assemblies are now completely separate from one another.

SpO2 module

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Front Case Disassembly Procedures

Procedure to remove SpO2 module, ECG/Temp connector assembly, and encoder assembly:

• SpO

module: remove the three screws located at the corners of the

SpO

module and lift off the ground wire and the foil shield. Then pull

the SpO

module straight up to disengage it from main PCB.

Note Important for reassembly: the insulator goes on the non-foil

screw hole. The washers, star-washers, and foil screw holes should be assembled together.

• ECG/Temp cable/connector assembly: unplug the connector from the main PCB. Remove the screws fastening the ECG connector to the front case, rotate the temperature connector counter-clockwise to unscrew it from the fastening nut on outside of the front case.

Disconnect the white cable and move the SpO cable before attempting to disconnect the temperature connector.

• The encoder assembly: unplug the connector from the main PCB. Remove the wheel, as described in step 1A. Use a 9/16” hex socket to unscrew the fastening nut on the outside of the front case. The encoder can then be pulled away from the front case.

During reassembly, the ribbon cable should orient towards the PCB, and after connection, the excess should be fed under the PCB.

front connector ground

Procedure to remove the main PCB:

1. Disconnect the connectors from the main PCB for:

• Switch panel

•SpO

•ECG/Temp

• Encoder

• LCD (display). Do not cut the tie wrap over the connector, slide it

out of the way to remove the connector.

•Backlight

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Encoder

Switch panel connector

Disassembly Procedures (A3)

NiBP tubing connector

SpO

cable

2. Use a screwdriver to remove the six fastening screws around the periphery of the main PCB. Retain the fastening screws for reassembly.

3. Lift the main PCB slightly and unscrew the tubing connector near the NiBP front panel fitting.

4. The main PCB can now be removed. This allows access to the SpO

front panel connector, NiBP fitting and backlight inverter. These can be removed by removing the appropriate screws or nuts.

During reassembly, the backlight inverter cable should be wrapped over the screw post. (See the upper left hand corner of the picture).

Backlight inverter cable

Backlight inverter Display backplate

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Procedure to remove the switch panel:

1. The switch panel is attached with an adhesive to the front panel.

2. Carefully lift up one corner of the switch panel and peel it away from the front panel. When the switch panel is free, feed the connector through the slot in the front panel.

Procedure to remove the LCD:

1. Remove the six fastening screws around the periphery of the display backplate. Retain the fastening screws for reassembly.

2. Carefully remove the metal and foil grounding tabs and washer noting their location and orientation for reassembly. The display backplate can now be removed.

3. Disconnect the backlight connector from the backlight inverter. The LCD can now be lifted out of the front bezel assembly.

For reassembly, place the LCD into the backplate before seating down on the screws. Confirm that the foil ground tab and unused white wire cable is placed out of the way and over the taller standoff.

Foil ground tab

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Rear Case Disassembly Procedures

Procedure to remove the battery:

1. Use a screwdriver to remove the three screws holding the battery cover plate in place.

Disassembly Procedures (A3)

2. Grasp the strap, accessible through the opening in the top foam cover, and gently pull the battery from its housing.

3. Remove the wire connectors from the battery clips. Remember that the red wire is connected to the plus (+) side of the battery pack.

The + indicator is located under the foam piece.

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Disassembly Procedures (A3)

Procedure to remove the recorder and the battery housing:

1. Remove the battery as described in the procedure on page 83. Carefully remove the two foam battery pads from the battery housing.

2. If a recorder is installed, remove it as described in the procedure on page 78.

3. If a recorder is not installed, remove the recorder blanking cover by slipping a small flat-blade screwdriver into one of the slots on the blanking cover. Use a screwdriver to gently depress the snap-tab on the inside of the cover, while pulling the cover away from the monitor. After the first tab is released, repeat the process on the other side of the cover and remove cover.

Recorder housing

4. On the rear panel of the monitor, remove the three screws fastening the battery housing.

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5. Carefully slide the battery housing from the rear case assembly.

Screws fastening battery housing

6. Disconnect the speaker twisted-pair-connector from the power supply PCB. The speaker is mounted on one side of the battery housing.

7. If a recorder is installed, disconnect the ribbon cable from the recorder PCB. The recorder PCB can be removed by removing the four screws fastening the PCB to the battery housing.

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Procedure to remove fuses:

1. Remove the AC power input fuses, as shown, using the fuse pullers.

Fuse F1

Fuse F2

Procedure to remove the power supply assembly:

1. On the rear panel of the monitor, remove the eight screws holding the power supply assembly.

Screws fastening the power supply assembly

2. Carefully lift the power supply assembly from the rear case.

3. The power supply assembly can be disassembled into the following elements:

• Power supply PCB

• NiBP pump

• Heat sink/chassis

• Main ribbon cable

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Main PCB

Disassembly Procedures (A3)

NiBP pump assembly

Main ribbon cable

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Disassembly Procedures (A3)

88 Chapter 6 - Disassembly Guide

Philips M3921A, M3922A, M3923A, M3924A, M3926A User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

About this Manual

Proprietary Information

Warranty

Copyright

Printing History

Philips Software License Terms

ATTENTION: USE OF THE SOFTWARE IS SUBJECT TO THE PHILIPS SOFTWARE LICENSE

Text Conventions

Explanation of Symbols

Manual Overview

Introduction

Patient Monitor Description

Introduction to External Recorder (M3925A)

Related Documents

Routine Maintenance

Cleaning

Periodic Safety And Functional Checks

Battery

Environmental Protection

Introduction

Performance Verification

Test And Inspection Matrix

Equipment Needed

Performance Tests

Battery Charge

Battery Performance Test

Power-On Self-Test

Hardware and Software Tests

SpO2 Testing A1, A3 - all models

n Alarms and Alarm Silence

LED Excitation Test

Operation with an ECG Simulator

Operation with a Respiration Simulator (A3 only)

Verification of Pneumatic System

Pneumatic Leakage The pneumatic leakage test verifies the integrity of the pneumatic system.

Inflation Rate The inflation rate test verifies the inflation rate of the monitor.

Over-Pressure The over-pressure test verifies the functionality of the over-pressure relief

Deflation Rate The deflation rate test verifies the deflation rate of the A3 monitor. (There is

Operation with a Temperature Simulator (A1 only)

Operation with a Temperature Simulator (A3 only)

General Operation

Serial Interface Test

Printer Verification (For A1 Optional Printer M3925A)

Safety Tests

Ground Integrity

Electrical Leakage

n Earth Leakage Current (A3 only)

n Enclosure Leakage Current

Introduction

Power-up Defaults Menu

Power-up Defaults Menu And Diagnostic Mode 37

Diagnostic Mode

Error Codes

System Information

System A/D Values

NIBP Test

Restoring Factory Settings

Introduction

How To Use This Section

Troubleshooting

Who Should Perform Repairs

Replacement Level Supported

Obtaining Replacement Parts

Troubleshooting Guide

Power

Error Codes

Generating an Error Log Printout (A1 only)

Serviceable Hardware Error Codes

Other Error Codes (All Monitors)

Buttons/Wheels (All Monitors)

Display/Audible Tones (All Monitors)

Operational Performance

Disassembly Guide

Introduction

How To Use This Chapter

Disassembly Procedures (A1)