MAINTENANCE
& SERVICE GUIDE
Compaq Deskpro 2000
Series of Personal Computers
Pentium Processor with MMX Technology
and Pentium II Processor
September 1997 Edition
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Notice
The information in this guide is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR
EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN; NOR FOR INCIDENTAL
OR CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING,
PERFORMANCE, OR USE OF THIS MATERIAL.
This guide contains information protected by copyright. No part of this guide may be photocopied
or reproduced in any form without prior written consent from Compaq Computer Corporation.
1997 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.
Compaq, Deskpro
Registered U. S. Patent and Trademark Office.
Microsoft, MS-DOS, and Windows are registered trademarks of Microsoft Corporation.
The software described in this guide is furnished under a license agreement or nondisclosure
agreement. The software may be used or copied only in accordance with the terms of the
agreement.
Product names mentioned herein may be trademarks and/or registered trademarks of their
respective companies.
Maintenance and Service Guide
Compaq Deskpro 2000 Series of Personal Computers
Pentium Processor with MMX Technology
and Pentium II Processor
Second Edition (September 1997)
Part Number 278785-002
Spare Part Number 278041-001
Compaq Computer Corporation
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CPS
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CONTENTS
preface
About this Guide
Symbols and Conventions............................................................................................ ix
Technician Notes........................................................................................................... x
System Serial Number................................................................................................... x
Locating Additional Information .................................................................................. x
chapter 1
Product Description
1.1 Compaq Deskpro 2000 Series of Personal Computer Models........................... 1-2
1.1.1 Desktop Models..................................................................................... 1-2
1.1.2 Minitower Models................................................................................. 1-2
1.2 Features .............................................................................................................. 1-3
1.2.1 Pentium System Feature Summary ....................................................... 1-3
1.2.2 Pentium II System Feature Summary.................................................... 1-3
1.2.3 Features Common to Both..................................................................... 1-4
1.3 System Design.................................................................................................... 1-5
1.3.1 Design Overview................................................................................... 1-5
1.3.2 System Board ........................................................................................ 1-6
1.3.3 Processor ............................................................................................... 1-6
1.3.4 System Memory .................................................................................... 1-6
1.3.5 Cache Memory...................................................................................... 1-6
1.3.6 Graphics Controllers ............................................................................. 1-7
1.3.7 Chipsets................................................................................................. 1-7
1.3.8 System I/O............................................................................................. 1-8
1.3.9 System BIOS......................................................................................... 1-8
1.3.10 Expansion Slots..................................................................................... 1-9
1.3.11 Power Supply ........................................................................................ 1-9
1.3.12 Diskette Drive Interface ........................................................................ 1-9
1.3.13 Serial Port.............................................................................................. 1-9
1.3.14 Parallel Port........................................................................................... 1-9
1.3.15 System Security................................................................................... 1-10
1.3.16 Keyboard/Mouse Controller................................................................ 1-10
1.3.17 Real-Time Clock and CMOS RAM.................................................... 1-10
1.3.18 Power Supply Fan ............................................................................... 1-10
1.3.19 Speaker................................................................................................ 1-10
1.3.20 Software .............................................................................................. 1-10
1.3.21 Ordering Additional Operating System Drivers.................................. 1-11
1.3.22 Intelligent Manageability .................................................................... 1-12
1.4 Desktop Computer Features............................................................................. 1-14
Contents
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1.4.1 Front Panel Controls and LEDs .......................................................... 1-14
1.4.2 Drive Positions.................................................................................... 1-15
1.4.3 Rear Panel Connectors ........................................................................ 1-16
1.5 Minitower Computer Features.......................................................................... 1-17
1.5.1 Front Panel Lights and Controls.......................................................... 1-17
1.5.2 Drive Positions.................................................................................... 1-18
1.5.3 Rear Panel Connectors ........................................................................ 1-20
1.6 Enhanced Keyboard ......................................................................................... 1-22
1.7 Options ............................................................................................................. 1-24
1.7.1 Cache Upgrade.................................................................................... 1-24
1.7.2 System Memory .................................................................................. 1-24
1.7.3 Audio Upgrade.................................................................................... 1-24
1.7.4 Mass Storage Options.......................................................................... 1-24
1.7.5 Monitor Options.................................................................................. 1-25
1.7.6 Graphics Controllers and Memory Options ........................................ 1-25
1.7.7 Serial/Parallel Interface Board ............................................................ 1-25
1.7.8 PD-CD Drive....................................................................................... 1-26
1.7.9 Modems............................................................................................... 1-26
chapter 2
Compaq Utilities
2.1 Getting Ready..................................................................................................... 2-1
2.1.1 Preparing the Computer ........................................................................ 2-1
2.1.2 Create a Diagnostics Diskette .............................................................. 2-2
2.1.3 Accessing the Compaq Utilities Menu.................................................. 2-2
2.2 Computer Setup.................................................................................................. 2-3
2.2.1 Security Features................................................................................... 2-5
2.2.2 QuickLock/QuickBlank ........................................................................ 2-9
2.3 Computer Checkup (TEST) ............................................................................. 2-10
2.4 View System Information (INSPECT)............................................................. 2-11
2.5 Create a Diagnostics Diskette........................................................................... 2-12
2.6 Managing the Diagnostics Partition ................................................................. 2-12
2.7 Exiting the Compaq Utilities Menu ................................................................. 2-13
2.8 Compaq Enhanced Insight Personal Edition (Diagnostics for Windows)........ 2-13
2.9 Power-On Self-Test (POST) ............................................................................ 2-13
2.10 ROMPaq........................................................................................................... 2-14
2.11 Compaq Intelligent Manageability................................................................... 2-15
2.11.1 Asset Management .............................................................................. 2-15
2.11.2 Fault Management............................................................................... 2-16
2.11.3 Security Management.......................................................................... 2-17
2.11.4 Configuration Management................................................................. 2-18
2.11.5 Integration Management ..................................................................... 2-24
2.12 Protecting Your Software................................................................................. 2-26
2.12.1 Ordering Backup Diskettes ................................................................. 2-26
2.12.2 Restoring Your Hard Drive in Windows 95........................................ 2-27
2.13 Prefailure Warranty.......................................................................................... 2-27
iv
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chapter 3
Illustrated Parts Catalog
3.1 System Unit........................................................................................................ 3-2
3.2 Mass Storage Devices ........................................................................................ 3-6
3.3 Cables................................................................................................................. 3-8
3.4 Standard and Optional Boards.......................................................................... 3-10
3.5 Keyboards......................................................................................................... 3-14
3.6 Monitors ........................................................................................................... 3-16
3.7 Miscellaneous Hardware Kit............................................................................ 3-19
3.8 Miscellaneous Plastics Kit ............................................................................... 3-20
3.9 Miscellaneous Parts.......................................................................................... 3-22
3.10 Shipping Boxes ................................................................................................ 3-24
3.11 Documentation................................................................................................. 3-25
3.12 Software ........................................................................................................... 3-26
chapter 4
Removal and Replacement Prelinimaries
4.1 Electrostatic Discharge Information................................................................... 4-1
4.1.1 Generating Static................................................................................... 4-1
4.1.2 Preventing Electrostatic Damage to Equipment.................................... 4-2
4.1.3 Personal Grounding Methods................................................................ 4-2
4.1.4 Grounding Workstations ....................................................................... 4-3
4.1.5 Personal Grounding Equipment ............................................................ 4-3
4.1.6 Recommended Materials and Equipment.............................................. 4-3
4.2 Routine Care....................................................................................................... 4-4
4.2.1 General Cleaning Safety Precautions.................................................... 4-4
4.2.2 Cleaning the Computer Case................................................................. 4-4
4.2.3 Cleaning the Keyboard.......................................................................... 4-5
4.2.4 Cleaning the Monitor ............................................................................ 4-5
4.2.5 Cleaning the Mouse............................................................................... 4-5
4.3 Service Considerations....................................................................................... 4-6
4.3.1 Tools and Software Requirements ........................................................ 4-6
4.3.2 Screws ................................................................................................... 4-6
4.3.3 Cables and Connectors.......................................................................... 4-6
4.3.4 Hard Drives ........................................................................................... 4-7
4.3.5 Plastic Parts ........................................................................................... 4-7
4.3.6 Lithium Battery ..................................................................................... 4-7
chapter 5
Removal and Replacement Procedures - Desktop
5.1 Serial Number .................................................................................................... 5-1
5.2 Disassembly Sequence Chart ............................................................................. 5-2
5.3 Preparation for Disassembly .............................................................................. 5-3
5.4 Feet..................................................................................................................... 5-4
5.5 Cable Lock ......................................................................................................... 5-5
5.6 System Unit Cover ............................................................................................. 5-6
5.7 Speaker............................................................................................................... 5-7
5.8 Expansion Board ................................................................................................ 5-9
5.8.1 Inboard Expansion Board.................................................................... 5-10
Contents
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5.8.2 Outboard Expansion Board ................................................................. 5-11
5.9 System Board Components ............................................................................. 5-12
5.9.1 Memory Modules................................................................................ 5-12
5.9.2 System Board Graphics Memory Module Upgrade............................ 5-13
5.9.3 Microprocessor.................................................................................... 5-14
5.9.4 Cache Memory (Pentium System Only) ............................................. 5-17
5.10 Riser Board ..................................................................................................... 5-18
5.11 Riser Brace...................................................................................................... 5-19
5.12 Expansion Board Guide .................................................................................. 5-20
5.13 Replacement Battery....................................................................................... 5-21
5.14 Front Bezel Assembly..................................................................................... 5-23
5.14.1 Front Bezel......................................................................................... 5-23
5.14.2 Power Button...................................................................................... 5-24
5.14.3 Bezel Blank ........................................................................................ 5-25
5.14.4 Compaq Logo..................................................................................... 5-26
5.15 Power Supply Assembly ................................................................................. 5-27
5.15.1 Power Switch Assembly..................................................................... 5-27
5.15.2 Power Supply ..................................................................................... 5-29
5.16 Mass Storage Devices ..................................................................................... 5-30
5.16.1 3.5-Inch Drive Bays ........................................................................... 5-30
5.16.2 5.25-Inch Drive Bays ......................................................................... 5-32
5.16.3 Installing a New Drive ....................................................................... 5-34
5.17 Drive Cage ...................................................................................................... 5-37
5.18 LED Cable....................................................................................................... 5-38
5.19 System Board .................................................................................................. 5-40
chapter 6
Removal and Replacement Procedures - Minitower
6.1 Serial Number ................................................................................................... 6-1
6.2 Disassembly Sequence Chart ............................................................................ 6-2
6.3 Preparation for Disassembly ............................................................................. 6-3
6.4 Feet.................................................................................................................... 6-3
6.5 Cable Lock ........................................................................................................ 6-4
6.6 Exposing the Chassis......................................................................................... 6-5
6.6.1 Access Panel......................................................................................... 6-5
6.6.2 Minitower J Hood................................................................................. 6-6
6.7 Riser Brace ........................................................................................................ 6-7
6.8 Expansion Board ............................................................................................... 6-8
6.9 Expansion Board Guide .................................................................................. 6-10
6.10 Riser Board ..................................................................................................... 6-11
6.11 Speaker............................................................................................................ 6-12
6.12 System Board Components............................................................................. 6-13
6.12.1 Memory Module................................................................................. 6-13
6.12.2 Microprocessor................................................................................... 6-14
6.12.3 Cache Memory (Pentium System Only) ............................................ 6-17
6.12.4 System Board Graphics Memory Module Upgrade........................... 6-18
6.13 System Board .................................................................................................. 6-19
6.14 Replacement Battery....................................................................................... 6-22
6.15 ISA Option Board Retainer............................................................................. 6-24
vi
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6.16 Front Bezel Assembly..................................................................................... 6-25
6.16.1 Front Bezel.......................................................................................... 6-25
6.16.2 Power Button....................................................................................... 6-26
6.16.3 Bezel Blank ......................................................................................... 6-27
6.16.4 Compaq Logo...................................................................................... 6-28
6.17 Power Supply Assembly................................................................................. 6-29
6.17.1 Power Supply Switch Assembly ......................................................... 6-29
6.17.2 Power Supply ...................................................................................... 6-31
6.18 LED Cable ...................................................................................................... 6-32
6.19 Mass Storage Devices..................................................................................... 6-34
6.19.1 3.5-Inch Drive Bays ............................................................................ 6-34
6.19.2 5.25-Inch Drive Bays .......................................................................... 6-36
6.19.3 Installing a New Drive ........................................................................ 6-38
chapter 7
Jumper and Switch Information
7.1 System Board Switches...................................................................................... 7-2
7.1.1 Pentium-Based System Boards ............................................................. 7-2
7.1.2 Switch Settings...................................................................................... 7-5
7.2 System Board Jumpers....................................................................................... 7-6
7.2.1 Setting Power-On Password Jumpers.................................................... 7-7
7.2.2 Clearing Configuration.......................................................................... 7-8
7.2.3 Changing the Real-Time Clock (RTC) Battery..................................... 7-9
7.3 Hard Drives ...................................................................................................... 7-10
7.3.1 2.1-GB EIDE Hard Drive Jumper Settings ......................................... 7-10
7.3.2 3.2-GB EIDE Hard Drive Jumper Settings ......................................... 7-12
7.3.3 Optional Ultra SCSI Hard Drive Jumper Settings............................... 7-14
7.3.4 Optional Ultra ATA Hard Drives Jumper Settings ............................. 7-16
7.4 CD-ROM Drive Jumper Settings ..................................................................... 7-18
7.5 Optional PD-CD Drives ................................................................................... 7-18
7.5.1 SCSI PD-CD Drive Jumper Settings................................................... 7-18
7.6 Diskette Drive .................................................................................................. 7-19
chapter 8
Specifications
8.1 System................................................................................................................ 8-1
8.2 Drives ................................................................................................................. 8-7
8.3 Audio System................................................................................................... 8-14
8.4 Keyboard.......................................................................................................... 8-14
8.5 Mouse............................................................................................................... 8-15
8.6 Supported Graphics Resolutions ...................................................................... 8-15
Contents
vii
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appendix A
Connector Pin Assignments......................................................................................................... A-1
appendix B
Power Cord Set Requirements
General Requirements............................................................................................... B-1
Country-Specific Requirements................................................................................ B-2
appendix C
Hard Drives
Device 0/Device 1 Relationship................................................................................ C-1
Cable Select............................................................................................................... C-1
SMART..................................................................................................................... C-2
Automatic Soft-Drive Types..................................................................................... C-2
appendix D
SCSI Guidelines ............................................................................................................................D-1
appendix E
Diagnostic Error Codes
SCSI Error Codes.......................................................................................................E-9
appendix F
POST Error Messages................................................................................................................... F-1
appendix G
Troubleshooting Without Diagnostics
Checklist for Solving Minor Problems ..................................................................... G-1
Power Problems ........................................................................................................ G-2
Diskette Drive Problems ........................................................................................... G-3
Display Problems ...................................................................................................... G-4
Printer Problems........................................................................................................ G-5
Hard Drive Problems................................................................................................. G-6
Hardware Installation Problems................................................................................ G-7
CD-ROM Drive Problems......................................................................................... G-8
Memory Problems..................................................................................................... G-9
SCSI Problems .......................................................................................................... G-9
Network Problems................................................................................................... G-10
Resolving Audio Hardware Conflicts ..................................................................... G-12
appendix H
Intel 440LX Chipset Memory Limitations ....................................................................................H-1
Index............................................................................................................................................... I-1
viii Contents
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preface
ABOUT THIS GUIDE
This Maintenance and Service Guide is a troubleshooting and repair guide that can be used for
reference when servicing the Compaq Deskpro 2000 Series of Personal Computers. Only authorized
technicians trained by Compaq should attempt to repair this equipment.
Compaq Computer Corporation reserves the right to make changes to the Compaq Deskpro 2000
Series of Personal Computers without notice.
Symbols and Conventions
The following text and symbols mark special messages throughout this guide:
WARNING: Text set off in this manner indicates that failure to follow directions in the warning could result
in bodily harm or loss of life.
CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to
equipment or loss of data.
ꢀ Text set off in this manner presents commentary, sidelights, clarifying information, or
specific instructions.
The following format conventions distinguish elements of the text throughout this guide:
„ꢀ Drive letters that are not in command lines are presented in uppercase type as shown here:
drive A.
„ꢀ Directory or folder names that are not in command lines are presented in uppercase type as
shown here: DIRECTORY or FOLDER.
„ꢀ The file names are presented in uppercase italic type as shown here: FILENAME.
„ꢀ The names of commands are presented in lowercase as shown here: install or a:\install.
„ꢀ Commands that are to be entered at the system prompt may be shown on a separate line:
a:install
„ꢀ When you need to type information without pressing Enter, you are directed to “type” the
information.
„ꢀ When you need to type the information and press Enter, you are directed to “enter” the
information.
Preface
ix
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Technician Notes
WARNING: Only authorized technicians trained by Compaq should attempt to repair this equipment. All
troubleshooting and repair procedures are detailed to allow only subassembly/module level repair.
Because of the complexity of the individual boards and subassemblies, no one should attempt to make
repairs at the component level or to make modifications to any printed wiring board, Improper repairs can
create a safety hazard. Any indications of component replacement or printed wiring board modifications
may void any warranty.
CAUTION: To properly ventilate your system, you must provide at least 3-inches (7.62-cm) of clearance at
the front and back of the computer.
CAUTION: The computer is designed to be electrically grounded, To ensure proper operation, plug the AC
power cord into a properly grounded AC outlet only.
System Serial Number
The location of the serial number for the desktop computer is found in Chapter 5 and for the
minitower computer in Chapter 6 in this guide.
For the purpose of AssetControl, the serial number is embedded in the CMOS on the system board.
Locating Additional Information
The following documentation is available to support these products:
„ꢀ User Documentation
„ꢀ Technical Training Guides
„ꢀ Compaq Service Advisories and Bulletins
„ꢀ Compaq QuickFind
„ꢀ Technical Reference Guide
„ꢀ Compaq Service Quick Reference Guide
„ꢀ Compaq SmartStart for Workstations CD online documentation
x
Preface
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