Computer Dis Assembly

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Compaq Deskpro EN Series

of Personal Computers

Slim Desktop Models

Maintenance &

Service Guide


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Addendum to MSG 192128-002 1

Addendum #1 to Deskpro EN

Maintenance & Service Guide

Compaq Deskpro EN Series of Personal Computers

Slim Desktop

Part number 192128-002

Spare part number 201842-001

The complete MSG follows this addendum.

This addendum contains changes to the original document.

2000 Compaq Computer Corporation. COMPAQ and the Compaq logoRegistered in U. S. Patent and Trademark Office. Product names mentionedherein may be trademarks and/or registered trademarks of their respectivecompanies. Second Edition (September 2000).


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2 Addendum to MSG 192128-002

Spare Part Numbers

Description

Spare Part

Number

Warranty

Tier

Intel Celeron microprocessor

566 MHz/66 MHz with heatsink and retaining kit 203967-001 B

Graphics Controller

Nvidia TNT2 PRO, 16-MB SGRAM 179997-001 B

System board without onboard graphics or audio

(011032-101)

217055-001 B

10-GB Ultra ATA hard drive, 5400 ROM, Quiet Drive 203191-001 B

Audio cover 219817-001 D

System board 217055-001 does not support front-mounted audio. Computers withthis board installed will not have a speaker mounted in the chassis but will have a

piezo speaker mounted on the system board that supports diagnostic beeps.


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Addendum to MSG 192128-002 3

Specifications Graphics Controller

Nvidia TNT2 Pro Graphics Controller

Resolution Real-Time 3D

ShadingRefresh Rate/Display

Vertical Horizontal

640 x 480

800 x 600

1024 x 768

1152 x 864

1280 x 1024

1600 x 1200

1800 x 1440

1920 x 1080

1920 x 1200

256, 65K, 16.7M

256, 65K, 16.7M

256, 65K, 16.7M

256, 65K

256, 65K

256

65K

256

256/65K

60 200 Hz

60 200 Hz

60 140 Hz

60 120 Hz

60 100 Hz

60 90 Hz

60 70 Hz

60 80 Hz

60 76 Hz

31 102 kHz

38 114 kHz

48 113 kHz

54 110 kHz

64 107 kHz

75 113 kHz

89 1 04 kHz

70 94 kHz

75 95 kHz


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4 Addendum to MSG 192128-002

Service Notes

! WARNING: Removing the heatsink from the processor destroys the integrity of the thermal interface padbetween the two parts. Whenever the heatsink is removed from the processor, the old thermal interface

must be completely removed and a new one installed in its place.

Before installing a heatsink, prepare for its installation by doing one of the following:! New heatsink: if the heatsink has a thermal interface attached to its bottom, peel off the

protective paper before installing the heatsink.

! Reinstalled heatsink: Note where the thermal interface is located on the heatsink.Carefully remove the thermal interface pad and all residue from the heatsink surface. Ifany thermal interface remains on the die of the processor, scrape it off with yourfingernail. A Q-Tip dipped in alcohol can be used to clean both surfaces. Add thermalinterface pad to the bottom of the heatsink before reinstalling the original heatsink toinsure an efficient thermal interface.

CAUTION: Thermal interface heat transmission is reduced if residue remains on the heatsink or the

heatsink thermal interface surface is scratched. This could lead to the processor running at a higher

than normal temperature, fan turning at a higher than normal speed, and possible loss of data ifprocessor shuts down from overheating. Installing the heatsink assembly backwards will cause the

processor to overheat, since the aluminum core will only make partial contact with the processor die.


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Maintenance &Service GuideCompaq Deskpro EN Seriesof Personal Computers

Slim Desktop Models


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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.

2000 Compaq Computer Corporation.

Printed in the U.S.A.

COMPAQ, the Compaq logo, and Deskpro Registered in U. S. Patent and Trademark

Office.

Microsoft, MS-DOS, and Windows are registered trademarks of Microsoft

Corporation.

Intel and Pentium are registered trademarks of Intel Corporation.

Celeron is a trademark of Intel Corporation.

Product names mentioned herein may be trademarks and/or registered trademarks of

their respective companies.

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 withthe terms of the agreement.

Maintenance & Service Guide

Compaq Deskpro EN Series of Personal Computers

Slim Desktop Models

Second Edition (September 2000)

First Edition (June 2000)

Part Number 192128-002

Spare Part Number 201842-001

Compaq Computer Corporation


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Contents iii

CONTENTS

preface

About This Guide

Symbols and Conventions ........................................................................................................ vii

Technician Notes...................................................................................................................... vii

Locating Additional Information.............................................................................................viii

chapter 1

Product Description

1.1 Product Features..............................................................................................................1-2

1.1.1 Front Panel Controls and LEDs..........................................................................1-2

1.1.2 Rear Panel Connectors........................................................................................ 1-3

1.1.3 Drive Positions ................................................................................................... 1-4

1.2 Serial Number Location .................................................................................................. 1-51.3 Locating Additional Information .................................................................................... 1-6

chapter 2

Spare Parts

2.1 System Unit..................................................................................................................... 2-1

2.2 Mass Storage Devices ..................................................................................................... 2-2

2.3 Cables..............................................................................................................................2-3

2.4 Standard, Memory, and Expansion Boards.....................................................................2-4

2.5 Keyboards ....................................................................................................................... 2-5

2.6 Miscellaneous Screw Kit.................................................................................................2-6

2.7 Miscellaneous Plastics Kit ..............................................................................................2-7

2.8 Miscellaneous Parts......................................................................................................... 2-82.9 Shipping Boxes ...............................................................................................................2-9

2.10 Documentation and Software..........................................................................................2-9

chapter 3

Removal & Replacement Preliminaries

3.1 Electrostatic Discharge Information................................................................................ 3-1

3.1.1 Generating Static ................................................................................................ 3-1

3.1.2 Preventing Electrostatic Damage to Equipment ................................................. 3-2

3.1.3 Personal Grounding Methods and Equipment....................................................3-2

3.1.4 Grounding Workstations..................................................................................... 3-2

3.1.5 Recommended Materials and Equipment........................................................... 3-3

3.2 Routine Care ...................................................................................................................3-33.2.1 General Cleaning Safety Precautions .................................................................3-3

3.2.2 Cleaning the Computer Case ..............................................................................3-4

3.2.3 Cleaning the Keyboard ....................................................................................... 3-4

3.2.4 Cleaning the Monitor.......................................................................................... 3-4

3.2.5 Cleaning the Mouse ............................................................................................ 3-5


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iv Contents

3.3 Service Considerations....................................................................................................3-5

3.3.1 Power Supply Fan...............................................................................................3-5

3.3.2 Tools and Software Requirements......................................................................3-5

3.3.3 Screws.................................................................................................................3-5

3.3.4 Cables and Connectors ....................................................................................... 3-6

3.3.5 Hard Drives ........................................................................................................ 3-6

3.3.6 Lithium Coin Cell Battery .................................................................................. 3-6

chapter 4

Removal & Replacement Procedures

4.1 Disassembly Sequence Chart .......................................................................................... 4-2

4.2 Preparation for Disassembly ........................................................................................... 4-3

4.3 Unlocking the Smart Cover Lock ................................................................................... 4-4

4.4 Computer Feet................................................................................................................. 4-6

4.5 Cable Lock Installation ................................................................................................... 4-7

4.6 Access Panel ...................................................................................................................4-8

4.7 Front Bezel...................................................................................................................... 4-9

4.8 Front Panel Trim...........................................................................................................4-10

4.9 Removing a Blank Drive Bezel.....................................................................................4-11

4.10 Installing Additional Memory....................................................................................... 4-12

4.10.1 DIMMs.............................................................................................................4-12

4.10.2 Memory Module Installation............................................................................ 4-12

4.11 Expansion Cards ........................................................................................................... 4-14

4.11.1 Removing an Expansion Slot Cover................................................................. 4-14

4.11.2 Removing or Installing a PCI Expansion Card.................................................4-14

4.12 Graphics Cards..............................................................................................................4-16

4.12.1 Graphics Performance Accelerator (GPA)/AGP Inline Memory

Module (AIMM) Card with a Type I Retention Mechanism......... .......... .......... ........ 4-16

4.12.2 AGP Card with a Type I Retention Mechanism............................................... 4-19

4.12.3 GPA/AIMM Card with a Type 2 Retention Mechanism.................................. 4-20

4.12.4 AGP Card with a Type 2 Retention Mechanism .............................................. 4-21

4.12.5 Standard AGP Expansion Card ........................................................................ 4-22

4.13 5.25-Inch Drives ........................................................................................................... 4-234.14 Rotating the Drive Cage................................................................................................4-24

4.15 Drives............................................................................................................................4-25

4.15.1 Installing Additional Drives ............................................................................. 4-25

4.15.2 Diskette Drive...................................................................................................4-26

4.15.3 Hard Drive........................................................................................................ 4-27

4.16 System Board................................................................................................................ 4-28

4.17 Battery........................................................................................................................... 4-29

4.18 Power Button/LED Board............................................................................................. 4-30

4.19 Hood Sensor.................................................................................................................. 4-31

4.20 Processor Assembly ...................................................................................................... 4-32

4.21 Speaker..........................................................................................................................4-33

4.22 Power Supply ................................................................................................................4-34

4.23 Chassis Fan Assembly................................................................................................... 4-35


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Contents v

chapter 5

Connectors & Jumpers

5.1 System Board .................................................................................................................. 5-1

5.1.1 Connectors and Jumpers..................................................................................... 5-1

5.1.2 Clearing CMOS..................................................................................................5-2

5.1.3 Disabling or Clearing the Power-On and Setup Passwords................................ 5-3

5.1.4 CMOS Archive and Restore (Power Switch Override) ......................................5-45.2 Hard Drive Jumper Settings............................................................................................ 5-5

5.2.1 Seagate, Quantum, and Western Digital............................................................. 5-5

5.2.2 Maxtor ................................................................................................................5-6

chapter 6

Specifications

6.1 System............................................................................................................................. 6-1

6.1.1 Specifications ..................................................................................................... 6-1

6.1.2 System Interrupts................................................................................................6-2

6.1.3 System DMA...................................................................................................... 6-2

6.1.4 ICH Fixed I/O Registers..................................................................................... 6-3

6.1.5 System Memory Map ......................................................................................... 6-56.2 Drives.............................................................................................................................. 6-6

6.2.1 Diskette Drive.....................................................................................................6-6

6.2.2 Ultra ATA Hard Drives ...................................................................................... 6-7

6.2.3 CD-ROM Drive.................................................................................................. 6-8

6.3 Compaq Keyboards......................................................................................................... 6-9

6.4 Compaq Scroll Mouse..................................................................................................... 6-9

6.5 Supported Graphics Resolutions...................................................................................6-10

6.5.1 Intel 3D Graphics ............................................................................................. 6-10

6.5.2 nVIDIA TNT 3D AGP ..................................................................................... 6-10

chapter 7

Service Notes...................................................................................................................................... 7-1

Index ......................................................................................................................................................I-1


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Compaq Deskpro EN Series of Personal Computers vii

preface

ABOUT THIS GUIDE

ThisMaintenance & Service Guide is a troubleshooting and repair guide that can be usedfor reference when servicing the CompaqDeskpro EN 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 these modelswithout 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, clarifyinginformation, or specific instructions.

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.

!WARNING: To reduce the risk of electric shock or damage to the equipment:

Do not disable the power grounding plug. The grounding plug is an important safety feature.

Plug the power cord into a grounded (earthed) electrical outlet that is easily accessible at all times. Disconnect the power from the computer by unplugging the power cord either from the electrical

outlet or the computer.

CAUTION: To properly ventilate your system, you must provide at least 3 inches (7.6 cm) of clearanceat the front and back of the computer.


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viii About This Guide

Locating Additional Information

The following documentation is available to support these products:

I User Documentation

I Technical Training Guides

I Compaq Service Advisories and Bulletins

I Compaq QuickFind

I Technical Reference Guide

I Compaq Quick Reference Guide

I Compaq Service Reference Guide

I Compaq Quick Troubleshooting Guide


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Compaq Deskpro EN Series of Personal Computers 1-1

chapter1PRODUCT DESCRIPTION

This chapter describes the model features of the Compaq Deskpro EN Series SlimDesktop model of Personal Computers.


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1-2 Product Description

1.1 Product Features

The Slim Desktop models ship with a mouse and keyboard. A Compaq color monitor orother compatible monitor, which is also required to operate the computer, must bepurchased separately.

1.1.1 Front Panel Controls and LEDs

1 Power-On Light Turns on when power to the computer is turned on and blinks(optional) in Energy Saver mode.

2 Dual-State Power Button Switches the computer between sleep and wakeup modes;can be configured as an on/off button.

3 Hard Drive Activity Light Turns on when the hard drive is reading or saving data.

4 Stereo Headphone Jack Connects headphones to the CD-ROM drive.

5 CD-ROM Drive Volume Control Controls volume to headphones from CD-ROM drive.

6 Diskette Drive Activity Light Turns on when the diskette drive is reading or saving data.

7 CD-ROM Drive Busy Indicator Flashes when the drive is reading a CD-ROM.

8 Diskette Eject Button Ejects a loaded diskette.

9 CD-ROM Eject Button Ejects a CD-ROM from the drive.


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1.1.2 Rear Panel Connectors

1 Voltage Select Switch Switches voltage between 115V and 230V to matchgeographical requirements.

2 Power Cord Connector Connects the computer to an electrical power outlet.

3 Universal Serial Bus (USB)Connectors

Plug and Play connectors connect the computer to any USBperipheral while the computer is operating.

4 Keyboard Connector Connects the keyboard.

5 Parallel Port Connector Connects a parallel device, such as a parallel printer.

6 Mouse Connector Connects the mouse.

7 Monitor Connector Connects a monitor.

8 Serial Connector Connect serial devices, such as a serial mouse and scanner.

9 Serial Connector Connect serial devices, such as a serial mouse and scanner.

: Ethernet RJ-45 Connector Connects the Ethernet network, using an RJ-45 cable.

; Microphone Connector Connects a microphone.

< Headphone/Line-Out AudioConnector

Provides connection for externally powered speakers,headphone, or for audio recording.

= Line-In Audio Connector Connects a device that supplies sound, such as a tape deck orCD player.

Connectors include icons for ease of identification.


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1.1.3 Drive Positions

1 Standard 5.25-inch drive bay for optional drives

2 Standard 3.5-inch, third-height bay for optional hard drive


4 Standard 3.5-inch, third-height, standard, 1.44-MB diskette drive bay

5 Standard 3.5-inch, third-height, standard hard drive bay

To verify the type, size, and capacity of the mass storage devices installed in thecomputer, run the F10 setup utility available at computer startup.


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1.2 Serial Number Location

Provide the computer serial number to Compaq when requesting information or orderingspare parts. The serial number is displayed on the rear of the computer below theexpansion slots 1 and also on the top of the computer access panel 2.


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1.3 Locating Additional Information

The following documentation is available to support these products:

I User Documentation

I Technical Training Guides

I Compaq Service Advisories and Bulletins

I Compaq QuickFind

I Technical Reference Guide

I Compaq Quick Reference Guide

I Compaq Service Reference Guide

I Compaq Quick Troubleshooting Guide


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chapter2SPARE PARTS

This chapter provides an illustrated parts breakdown and a reference for spare parts for theSlim Desktop model.

2.1 System Unit

Description Spare PartNumber WarrantyTier

1 Access panel Not spared

2 Chassis assembly Not spared

3 Front bezel 201272-001 D

4 Front panel trim Misc Plastics Kit D

5 Smart cover lock solenoid with cable 179189-001 B

6 Speaker 192518-001 D

7 Power supply, 200 W 176764-001 B


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2-2 Spare Parts

2.2 Mass Storage Devices

Description

Spare PartNumber

WarrantyTier

1 3.5-inch, 1.44-MB, buttonless diskette drive 191714-001 B

2 48X Max IDE CD-ROM drive, opal 187263-001 B

3 10.0-GB ATA/66 7200 RPM hard drive 135364-001 B

* 15.0-GB ATA/66 7200 RPM hard drive 192060-001 B

* 20.0-GB ATA/100 7200 RPM hard drive 180475-001 B*Not shown.


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2.3 Cables

DescriptionSpare PartNumber

WarrantyTier

Cable Kit, includes: 166879-002 B

1 Diskette drive data cable, 11 (143218-001)

* Single connection cable (108950-007) (not used with this product)

* Holder switch (166777-001) (not used with this product)

* Dual-LED, power (387727-001) (not used with this product)

* 40-position data cable (105876-001) (not used with this product)

* Diskette/tape drive cable (356107-001) (not used with this product)

* Diskette cable with twist (387795-001) (not used with this product)

Cable Kit, includes: 192264-001 B

2 Single connection, hard drive data cable (108950-021)

3 Single connection, CD-ROM drive data cable (108950-019)

4 CD audio (387527-001)

* 40 position data (105876-001) (not used with this product)

* Audio, SB, 21 (288489-002) (not used with this product)

*Not shown.


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2-4 Spare Parts

2.4 Standard, Memory, and Expansion Boards


WarrantyTier

1 Nvidia 16MB SDRAM AGP Card 179997-001 B

Memory Module (SDIMM, 133 MHz)

2 64 MB 170080-001 B

* 128 MB 170081-001 B

* 256 MB 192014-001 B

Intel Pentium III Processor

3 667/133 MHz with heatsink and clip 192007-001 B

3 733/133 MHz with heatsink and clip 192008-001 B

* 800/133 MHz with fansink (191845-002). Fansink includesfan, heatsink, and clip.

192009-001 B


192006-001 B


192010-001 B

4 AIMM (GPA) 4MB, 133MHz Graphics Card 192012-001 B

5 System Board, 815e chipset 187498-001 B

*Not shown.


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2.5 Keyboards

Description Spare Part Number WarrantyTier

* Easy Access Keyboard-US 123130-xxx D

* USB Easy Access Keyboard-US 173304-xxx D

* Enhanced, Smart Card-US 125761-xxx D

* Basic, Smart Card-US 125790-xxx D

* Spacesaver, Opal 269513-xxx D

* Arabic -171

* Belgian -181

* Brazilian -201

* BHCSY (Bosnia-Herzegovina, Croatia,Slovenia, and Yugoslavia)

-B41

* Czech -221

* Danish -081

* Dutch/Netherlands -B31

* Finnish -351

* French -051

* French Canadian -121

* German -041

* Greek -151

* Hungarian -211

* Italian -061

* Japanese -191

* Korean (Hanguel) -AD1

* International -B31

* Latin American Spanish -161

* Norwegian -091

* Polish -B31

* Portuguese -131

* Russian -251

* Slovakian -231

* Spanish -071

* Swedish -101

* Swiss -111

* Taiwanese -AB1

* Thai -281

* Turkish -141

* UK -031

* US -001

*Not shown.


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2-6 Spare Parts

2.6 Miscellaneous Screw Kit


WarrantyTier

Miscellaneous Screw Kit, includes: 179180-001 D

* 6-32 x 1/4 hi-top, thread-forming screw with serrations (4 ea.)(192308-001)

* 6-19 x 5/16 panhead, plastite screw (5 ea.) (101346-068)

* 6-19 x .5/16 hi-top, taptite screw with captive washer (4 ea.)(114399-069)

* 6-32 x 3/16 hi-top, thread-forming screw with serrations (5 ea.)(192308-003)

* M3 x 5mm, hi-top, taptite screw with serrations (3 ea.)(247348-001)

* 6-32 x 3/16 buttonhead tamper-resistant, taptite screw withserrations (4 ea.) (296769-002)

* 6-32 x 5/16 hi-top, taptite screw (5 ea.) (109834-568)

* 6-19 x 1/2 Panhead, plastite screw (4 ea.) (101346-071)* Thumbscrew, molded cap (179333-002)

*Not shown.


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2.7 Miscellaneous Plastics Kit


WarrantyTier

Miscellaneous Plastics Kit, includes: 201271-001 D1 Bezel blank (2 ea.) (166775-001)

2 Front panel trim (piece below front bezel) (161056-001)

3 Rubber foot (4 ea.) (166939-002)

* Screw (for front panel trim) (2 ea.) (192308-001)

*Not shown.


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2-8 Spare Parts

2.8 Miscellaneous Parts


WarrantyTier

1 Power switch board with cable 192013-001 B

2 Smart cover lock solenoid with cable 179189-001 B

3 Speaker, 40x70, 12, with cable 192518-001 D

4 Battery 153099-001 D

5 Two-button scroll mouse 334689-002 D

6 Active fansink, includes fan, heatsink, and clip (for use with800MHz+ processors)

191845-002 B

* Chassis fan assembly (for use with 933MHz+ processors) 203618-001 D

* Tamper Resistant T-15 Wrench 166527-001 B

* Tamper Resistant T-15 Bit (5 ea.) 166527-002 B

* Hood sensor 204455-001 B

*Not shown.


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2.9 Shipping Boxes


WarrantyTier

PC Return kit (shipping box with packing) 207742-001 A

2.10 Documentation and Software


Documentation

Maintenance & Service Guide 201842-001

Illustrated Parts Map 203721-001

Service Reference Guide 152611-001

Quick Troubleshooting Guide 153837-001


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chapter3REMOVAL & REPLACEMENT PRELIMINARIES

This chapter provides general service information for the computer. Adherence to theprocedures and precautions described in this chapter is essential for proper service.

CAUTION: When the computer is plugged into an AC power source there is always voltage applied to

the system board. You must disconnect the power cord from the power source before opening the

computer to prevent system board or component damage.

3.1 Electrostatic Discharge Information

A sudden discharge of static electricity from your finger or other conductor can destroy

static-sensitive devices or microcircuitry. Often the spark is neither felt nor heard, butdamage occurs. An electronic device exposed to electrostatic discharge (ESD) may not beaffected at all and can work perfectly throughout a normal cycle. The device may functionnormally for a while, then degrade in the internal layers, reducing its life expectancy.

Networks built into many integrated circuits provide some protection, but in many cases,the discharge contains enough power to alter device parameters or melt silicon junctions.

3.1.1 Generating Static

The following table shows that:

! Different activities generate different amounts of static electricity.! Static electricity increases as humidity decreases.

Relative Humidity

Event 55% 40% 10%

Walking across carpet 7,500 V 15,000 V 35,000 V

Walking across vinyl floor 3,000 V 5,000 V 12,000 V

Motions of bench worker 400 V 800 V 6,000 V

Removing DIPs* from plastic tube 400 V 700 V 2,000 V

Removing DIPs* from vinyl tray 2,000 V 4,000 V 11,500 V

Removing DIPs* from Styrofoam 3,500 V 5,000 V 14,500 V

Removing bubble pack from PCB 7,000 V 20,000 V 26,500 V

Packing PCBs in foam-lined box 5,000 V 11,000 V 21,000 V*Dual Inline Packaging (DIP) is the packaging around individual microcircuitry.These are then multi-packaged inside plastic tubes, trays, or Styrofoam.

700 volts can degrade a product.


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3-2 Removal & Replacement Preliminaries

3.1.2 Preventing Electrostatic Damage to Equipment

Many electronic components are sensitive to ESD. Circuitry design and structuredetermine the degree of sensitivity. The following proper packaging and groundingprecautions are necessary to prevent damage to electric components and accessories.

! To avoid hand contact, transport products in static-safe containers such as tubes,bags, or boxes.

! Protect all electrostatic parts and assemblies with conductive or approvedcontainers or packaging.

! Keep electrostatic sensitive parts in their containers until they arrive at static-freestations.

! Place items on a grounded surface before removing them from their container.! Always be properly grounded when touching a sensitive component or assembly.! Avoid contact with pins, leads, or circuitry.! Place reusable electrostatic-sensitive parts from assemblies in protective packaging

or conductive foam.

3.1.3 Personal Grounding Methods and Equipment

Use the following equipment to prevent static electricity damage to equipment:

! Wrist straps are flexible straps with a minimum of one-megohm +/- 10%resistance in the ground cords. To provide proper ground, a strap must be wornsnug against bare skin. The ground cord must be connected and fit snugly into thebanana plug connector on the grounding mat or workstation.

! Heel straps/Toe straps/Boot straps can be used at standing workstations and arecompatible with most types of shoes or boots. On conductive floors or dissipativefloor mats, use them on both feet with a minimum of one-megohm +/- 10%

resistance between the operator and ground.

Static Shielding Protection Levels

Method Voltage

Antistatic plastic 1,500

Carbon-loaded plastic 7,500

Metallized laminate 15,000

3.1.4 Grounding Workstations

To prevent static damage at the workstation, use the following precautions:

! Cover the workstation with approved static-dissipative material. Provide a wriststrap connected to the work surface and properly grounded tools and equipment.

! Use static-dissipative mats, foot straps, or air ionizers to give added protection.! Handle electrostatic sensitive components, parts, and assemblies by the case or

PCB laminate. Handle them only at static-free workstations.

! Turn off power and input signals before inserting and removing connectors or testequipment.


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! Use fixtures made of static-safe materials when fixtures must directly contactdissipative surfaces.

! Keep work area free of nonconductive materials such as ordinary plastic assemblyaids and Styrofoam.

! Use field service tools, such as cutters, screwdrivers, and vacuums, that areconductive.

3.1.5 Recommended Materials and Equipment

Materials and equipment that are recommended for use in preventing static electricityinclude:

! Antistatic tape! Antistatic smocks, aprons, or sleeve protectors! Conductive bins and other assembly or soldering aids! Conductive foam! Conductive tabletop workstations with ground cord of one-megohm +/- 10%

resistance! Static-dissipative table or floor mats with hard tie to ground! Field service kits! Static awareness labels! Wrist straps and footwear straps providing one-megohm +/- 10% resistance! Material handling packages! Conductive plastic bags! Conductive plastic tubes! Conductive tote boxes! Opaque shielding bags! Transparent metallized shielding bags! Transparent shielding tubes

3.2 Routine Care

3.2.1 General Cleaning Safety Precautions

1. Never use solvents or flammable solutions to clean the computer.2. Never immerse any parts in water or cleaning solutions; apply any liquids to a cleancloth and then use the cloth on the component.3. Always turn off the computer when cleaning with liquids or damp cloths.4. Always turn off the computer before cleaning the keyboard, mouse, or air vents.5. Disconnect the keyboard before cleaning it.6. Wear safety glasses equipped with side shields when cleaning the keyboard.


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3.2.2 Cleaning the Computer Case

Follow all safety precautions in Section 3.2.1 before cleaning the computer.

To clean the computer case, follow the procedures described below:

! To remove light stains or dirt, use plain water with a clean, lint-free cloth or swab.! For stronger stains, use a mild dishwashing liquid diluted with water. Rinse well

by wiping it with a cloth or swab dampened with clear water.

! For stubborn stains, use isopropyl (rubbing) alcohol. No rinsing is needed as thealcohol will evaporate quickly and not leave a residue.

! After cleaning, always wipe the unit with a clean, lint-free cloth.! Occasionally clean the air vents on the computer. Lint and other foreign matter can

block the vents and limit the airflow.

3.2.3 Cleaning the Keyboard

Follow all safety precautions in Section 3.2.1 before cleaning the keyboard.

To clean the tops of the keys or the keyboard body, follow the procedures described inSection 3.2.2.

When cleaning debris from under the keys, review all rules in Section 3.2.1 beforefollowing these procedures:

CAUTION: Use safety glasses equipped with side shields before attempting to clean debris from under

the keys.

! Visible debris underneath or between the keys may be removed by vacuuming orshaking.

! Canned, pressurized air may be used to clean debris from under the keys. Cautionshould be used as too much air pressure can dislodge lubricants applied under the

wide keys.! If you remove a key, use a specially designed key puller to prevent damage to the

keys. This tool is available through many electronic supply outlets.

CAUTION: Never remove a wide leveled key (like the space bar) from the keyboard. If these keys are

improperly removed or installed, the keyboard may not function properly.

! Cleaning under a key may be done with a swab moistened with isopropyl alcoholand squeezed out. Be careful not to wipe away lubricants necessary for proper keyfunctions. Use tweezers to remove any fibers or dirt in confined areas. Allow theparts to air dry before reassembly.

3.2.4 Cleaning the Monitor! Wipe the monitor screen with a clean cloth moistened with water or with a

towelette designed for cleaning monitors. Do not use sprays or aerosols directly onthe screen, the liquid may seep into the housing and damage a component. Neveruse solvents or flammable liquids on the monitor.

! To clean the monitor body follow the procedures in Section 3.2.2.


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3.2.5 Cleaning the Mouse

Before cleaning the mouse, ensure that the power to the computer is turned off.

! Clean the mouse ball by first removing the retaining plate and the ball from thehousing. Pull out any debris from the ball socket and wipe the ball with a clean drycloth before reassembly.

! To clean the mouse body, follow the procedures in 3.2.2.

3.3 Service Considerations

Listed below are some of the considerations that you should keep in mind during thedisassembly and assembly of the computer.

3.3.1 Power Supply Fan

The power supply fan is a variable-speed fan based on the temperature in the powersupply.

CAUTION: The cooling fan is off only when the computer is turned off or the power cable has been

disconnected.

The cooling fan is always on in all other instances (when the computer is either in the On, Standby,

or Suspend mode).

You must disconnect the power cord from the power source before opening the computer to prevent

system board or component damage.

3.3.2 Tools and Software Requirements

To service the computer, you need the following:

!Torx T-15 screwdriver (Compaq screwdriver with bits PN 161946-001)

! Flat-bladed screwdriver (may sometimes be used in place of the Torx screwdriver)! Diagnostics software! Compaq tamper-resistant T-15 wrench (Smart Cover FailSafe Key, PN 166527-

001) or Compaq tamper-resistant bits (Smart Cover FailSafe Key, PN 166527-002)

! Torx T15 screwdriver with small diameter shank (to remove front bezel)3.3.3 Screws

The screws used in the computer are not interchangeable. They may have standard ormetric threads and may be of different lengths. If an incorrect screw is used during the

reassembly process, it can damage the unit. Compaq strongly recommends that all screwsremoved during disassembly be kept with the part that was removed, then returned to theirproper locations.

As each subassembly is removed from the computer, it should be placed awayfrom the work area to prevent damage.


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3.3.4 Cables and Connectors

Most cables used throughout the unit are flat, flexible cables. These cables must behandled with care to avoid damage. Apply only the tension required to seat or unseat thecables during insertion or removal from the connector. Handle cables by the connectorwhenever possible. In all cases, avoid bending or twisting the cables, and ensure that the

cables are routed in such a way that they cannot be caught or snagged by parts beingremoved or replaced.

CAUTION: When servicing this computer, ensure that cables are placed in their proper location during

the reassembly process. Improper cable placement can damage the computer.

3.3.5 Hard Drives

Handle hard drives as delicate precision components, avoiding all physical shock andvibration. This applies to failed drives as well as replacement spares.

! If a drive must be mailed, place the drive in a bubble-pack mailer or other suitableprotective packaging and label the package Fragile: Handle With Care.

! Do not remove hard drives from the shipping package for storage. Keep harddrives in their protective packaging until they are actually mounted in the CPU.

! Avoid dropping drives from any height onto any surface.! If you are inserting or removing a hard drive, turn off the computer. Do not remove

a hard drive while the computer is on or in standby mode.

! Before handling a drive, ensure that you are discharged of static electricity. Whilehandling a drive, avoid touching the connector. For more information aboutpreventing electrostatic damage, refer to Section 3.1, Electrostatic Discharge.

! Do not use excessive force when inserting a drive.! Avoid exposing a hard drive to liquids, temperature extremes, or products that

have magnetic fields such as monitors or speakers.

3.3.6 Lithium Coin Cell Battery

The battery that comes with the computer provides power to the real-time clock and has alifetime of about three years.

See Chapter 4, Removal and Replacement Procedures, for instructions on thereplacement procedures.

! WARNING: This computer contains a lithium-ion battery. There is a risk of fire and chemical burn ifthe battery is handled improperly. Do not disassemble, crush, puncture, short external contacts,

dispose in water or fire, or expose it to temperatures higher than 140F (60C).

CAUTION: Batteries, battery packs, and accumulators should not be disposed of together with the

general household waste.


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chapter4REMOVAL & REPLACEMENT PROCEDURES

This chapter provides subassembly/module level removal and replacement procedures forthe Slim Desktop model.

After completing all necessary removal and replacement procedures, run the Diagnosticsutility to verify that all components operate properly.

CAUTION: When the computer is plugged into an AC power source, there is always voltage

applied to the system board. You must disconnect the power cord from the power source before

opening the computer to prevent system board or component damage.


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4-2 Removal & Replacement Procedures

4.1 Disassembly Sequence Chart

4.3 Unlocking the Smart Cover Lock

4.4 Computer Feet

4.5 Cable Lock

4.6 Access Panel

4.7 Front Bezel

4.8 Front Panel Trim

4.9 Bezel Blank

4.10 Memory Module

4.11 Expansion Cards

4.12 Graphics Cards

4.13 5.25-Inch Drives

4.14 Rotate Drive Cage

4.15.2 Diskette Drive

4.15.3 Hard Drive4.16 System Board

4.17 Battery

4.18 Power Button/LED Board

4.19 Hood Sensor

4.20 Processor Assembly

4.21 Speaker

4.22 Power Supply

4.23 Chassis Fan Assembly

These steps are interdependent.


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4.2 Preparation for Disassembly

See Chapter 3, Removal and Replacement Preliminaries, for initial procedures.

1. Unlock Smart Cover Lock (Section 4.3). 2. Close any open software applications. 3. Exit Windows. 4. Remove any diskette or compact disc from the computer. 5. Turn off the computer and any peripheral devices that are connected to it.

CAUTION: Turn off the computer before disconnecting any cables.

CAUTION: When the computer is plugged into an AC power source there is always voltage applied

to the system board. You must disconnect the power cord from the power source before opening

the computer to prevent system board or component damage.

CAUTION: The cooling fan is off only when the computer is turned off or the power cable has

been disconnected.

The cooling fan is always on in all other instances (when the computer is either in the On,

Standby, or Suspend mode).

You must disconnect the power cord from the power source before opening the computer to

prevent system board or component damage.

6. Disconnect the power cord from the electrical outlet and then from the computer. 7. Disconnect all peripheral device cables from the computer. During disassembly, label each cable as you remove it, noting its position and

routing. Keep all screws with the units removed.

CAUTION: The screws used in the computer are of different thread sizes and lengths; using thewrong screw in an application may damage the unit.


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4.3 Unlocking the Smart Cover Lock

The Smart Cover Lock is a software-controllable cover lock. This lock preventsunauthorized access to the internal components when the Smart Cover Lock and setuppassword are enabled.

If you enabled the Smart Cover Lock, use Computer Setup to unlock it.

If you enabled the Smart Cover Lock and cannot enter your password to disable the lock,you will need a Smart Cover FailSafe Key (Compaq spare PN 166527-001 or 166527-002)to open the computer cover. You will also need the key in any of the followingcircumstances:

! Power outage! Startup failure! PC component (e.g., processor or power supply) failure! Lost password


CAUTION: When the computer is plugged into an AC power source there is always voltage applied

to the system board. You must disconnect the power cord from the power source before opening



been disconnected.






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1. Using the Smart Cover FailSafe Key, remove the top tamper-proof screw, and loosenthe bottom tamper-proof screw only enough to allow the computer access panel to beremoved.

2. Remove the access panel.To reattach the Smart Cover Lock, secure the lock in place with the tamper-proof screws.


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4.4 Computer Feet

1. Remove the four rubber feet mounted to the underside of the chassis. 2. If necessary, scrape the residue of the old feet from the chassis using a small, flat-

bladed screwdriver.

3. Remove the protective strip from the adhesive on the back of the new feet and pressthem into place.


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4.5 Cable Lock InstallationDepending on the model, the rear panel of the computer accommodates a cable lock sothat the computer can be physically secured to a work area.

1. Loop the cable around a heavy, fixed object to which you want to secure the computer. 2. Insert the cable lock end of the cable through the loop end of the cable. 3. Insert the lock into the appropriate slot on the rear of the computer and lock with the

key.

To remove the cable lock provision, reverse the installation procedure.

The appropriate cable lock for this system is the Kensington MicroSaver SecuritySystem, Model 64068.


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4.6 Access Panel 1. Prepare the computer for disassembly (Section 4.2).


CAUTION: When the computer is plugged into an AC power source there is always voltage appliedto the system board. You must disconnect the power cord from the power source before opening



been disconnected.





2. Loosen the thumbscrew located on the back of the unit 1. 3. Slide the cover latches toward the back of the computer 2. 4. Lift up the back of the access panel and pull it toward the back of the unit about 1 inch

(2.5 cm) so the tabs on the front of the access panel clear the case3. Lift the access

panel up and off the unit.

The configuration label located inside the computer cover provides additionalinformation.

Another label located inside the computer chassis provides information aboutdiagnosing computer conditions using the power and hard drive LEDs.

To replace the access panel, reverse the removal procedure.


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4.7 Front Bezel 1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. From the inside of the unit, remove the two screws from the left side of the front

bezel 1.

A Torx T15 screwdriver with small diameter shank is required to remove thescrews that attach the front bezel to the chassis.

4. Remove the bezel, left side first 2, while making sure the two hooks on the right sideof the bezel clear the slots in the chassis.

To install the front bezel, reverse the removal procedure.


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4.8 Front Panel Trim 1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Remove the front bezel (Section 4.7). 4. Remove the two screws connecting the trim to the front of the base pan 1. 5. Remove the trim from the computer 2.

To install the trim, reverse the removal procedure.

When installing the front trim, make sure the three hooks on the bottom of thetrim fit into the three associated slots in the base pan.


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4.10 Installing Additional MemoryThe computer comes with synchronous dynamic random access memory (SDRAM) dualinline memory modules (DIMMs).

4.10.1 DIMMs

The memory sockets on the Intel 815e chipsetbased system board can be populated withindustry-standard DIMMs. These memory module slots are populated with at least onepreinstalled memory module. To achieve the maximum memory support, you may berequired to replace the preinstalled DIMM with a higher capacity DIMM.

For proper system operation, the DIMMs must be industry-standard 168-pin, unbufferedPC100 or PC133 compliant SDRAM DIMMs, depending on the model. The SDRAMDIMMs must support CAS Latency 2 or 3 (CL = 2 or CL = 3). They must also contain themandatory Joint Electronic Device Engineering Council (JEDEC) Serial Presence Detect(SPD) information. DIMMs constructed with x4 SDRAM (16 ICs per side) are notsupported; the system will not start using unsupported DIMMs.

The Intel 815e chipset supports both PC100 and PC133 SDRAM DIMMs. PC133 DIMMs

should be used for optimal performance. If both PC100 and PC133 SDRAM DIMMs areinstalled in a computer, the system memory will run at the lower 100Mhz speed. Someconfigurations of PC133 SDRAMs may run at 100Mhz, instead of 133Mhz.

4.10.2 Memory Module Installation

CAUTION: Your memory module sockets have gold metal contacts. When upgrading yourmemory, it is important to use memory modules with gold metal contacts to prevent corrosion

and/or oxidation resulting from having incompatible metals in contact with each other.

CAUTION: Static electricity can damage the electronic components of the computer or optionalcards. Before beginning these procedures, ensure that you are discharged of static electricity by

briefly touching a grounded metal object. Refer to Appendix F, Electrostatic Discharge, for more

information.CAUTION: When handling a memory module, be careful not to touch any of the contacts. Doing somay damage the module.

1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6) and locate the memory module sockets.

! WARNING: To reduce risk of personal injury from hot surfaces, allow the internal systemcomponents to cool before touching.


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3. Open both latches of the memory module socket 1, and insert the memory module intothe socket 2.

Begin by installing a module into the socket nearest the preinstalled module, and installthe modules following the numerical order of the sockets.

A memory module can be installed in only one way. Match the notch on the module withthe tab on the memory socket. Push the module down into the socket, ensuring that the

module is fully inserted and properly seated with the latches pushed in 3.


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4.11 Expansion Cards4.11.1 Removing an Expansion Slot Cover

1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Locate the correct vacant expansion card slot on the back of the computer. 4. Remove the screw at the top of the expansion slot cover, then remove the expansion

slot cover from the slot as illustrated.

To replace the expansion slot cover, reverse the removal procedure.

4.11.2 Removing or Installing a PCI Expansion Card

1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6).

If installing an expansion card, skip to step 8.

3. To remove an expansion card, disconnect any cables attached to the expansion card. 4. Remove the screw at the top of the expansion slot. 5. Hold the card at each end and carefully rock it back and forth until the connectors pull

free from the slot. Be sure not to scrape the card against other components.

6. Store the card in anti-static packaging. 7. Install an expansion slot cover or new expansion card to close the open slot

(Section 4.11.1).


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If not installing a new expansion card, skip to step 10.

8. To install a new expansion card in an open slot, remove the expansion slot cover(Section 4.11.1).

9. Slide the expansion card into the expansion slot and press it firmly into place.

When you install an expansion card, make sure you press firmly on the card sothat the entire connector seats properly in the expansion card slot.

10. Replace the screw at the top of the expansion slot.11. Replace the access panel.12. Connect external cables to the installed card, if needed.13. Reconfigure the computer, if necessary.


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4.12 Graphics CardsThe AGP expansion slot may come with a retention mechanism installed around it to holdgraphics cards securely in place. There are two different types of retention mechanismsthat may be installed around the AGP expansion slot.

4.12.1 Graphics Performance Accelerator (GPA)/AGP Inline Memory

Module (AIMM) Card with a Type I Retention Mechanism

Removing a GPA/AIMM Card

1. Prepare the computer for disassembly (Section 4.2).WARNING: Power is continuous to the system board and power supply even when the power

switch is turned off. To prevent damage to the unit, disconnect the power cord from the power

source or the unit before beginning disassembly procedures.

2. Remove the access panel (Section 4.6). 3. Pull the arm on the right side of the retention mechanism 1. 4. At the same time, rotate the front of the GPA/AIMM card up until it is at a 45 degree

angle2.

5. Remove the card from the expansion slot3.


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Installing a GPA/AIMM Card

WARNING: Power is continuous to the system board and power supply even when the power



1. Prepare the computer for disassembly (Section 4.2).

2.

Remove the access panel (Section 4.6). 3. Insert the hook1 on the left side of the GPA/AIMM card under the loop 2 on the leftside of the retention mechanism.

4. Rotate the right side of the card down until it is at a 45 degree angle 3.


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5. With the GPA/AIMM card at a 45 degree angle, slide the card toward the back of theexpansion slot4 until the fingers on the bottom of the card line up properly with the

connectors in the expansion slot.

CAUTION: The fingers on the bottom of the GPA/AIMM card must be properly aligned with theexpansion slot during installation. Misalignment may result in damage to the card or the AGP

connector.

6. While pulling the arm on the right side of the retention mechanism 5, rotate the carddown into the expansion slot until seated 6.


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4.12.2 AGP Card with a Type I Retention Mechanism

Removing an AGP Card


3.

Remove the screw at the top of the expansion slot. 4. Pull the arm on the right side of the retention mechanism. 5. Pull the card straight up to remove it from the expansion slot.

To install a graphics card, reverse the removal procedure.


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4.12.3 GPA/AIMM Card with a Type 2 Retention Mechanism

Removing a GPA/AIMM Card


3.

Pull the arm on the right side of the retention mechanism. 4. Pull the card straight up to remove it from the expansion slot.



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4.12.4 AGP Card with a Type 2 Retention Mechanism



3.

Remove the screw at the top of the expansion slot. 4. Pull the arm on the right side of the retention mechanism. 5. Pull the card straight up to remove it from the expansion slot.



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4.12.5 Standard AGP Expansion Card



3.

Remove the screw at the top of the expansion slot. 4. Remove the AGP graphics board as you would any PCI expansion board (Section 4.11).



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4.13 5.25-Inch DrivesCAUTION: When the computer is plugged into an AC power source, there is always voltageapplied to the system board. You must disconnect the power cord from the power source before


1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Disconnect the drive power cable, signal cable, and audio connector from the drive, if

applicable.

4. Press the drive release latch (labeled with an arrow) forward 1. 5. At the same time, push the drive toward the back of the computer2, then lift it out of

the drive cage 3.

To install a drive, reverse the removal procedure.


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4.14 Rotating the Drive CageThe rotating drive cage allows access to all drive bays for easy installation of additionaldrives, requiring no drive rails or brackets. With the drive cage rotated out from thechassis, you can easily connect the drive power and signal cables.

When installing optional drives, you must install guide screws to ensure the drive

will line up correctly in the drive cage. Compaq has provided extra guide screws,installed in the base of the computer chassis, next to the power supply.

! WARNING: Before removing the access panel, ensure that the computer is turned off and that thepower cord is disconnected from the electrical outlet.

1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Grasp the back of the drive cage and rotate it to its upright

position1. The cage remains connected to the chassis.


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4.15 DrivesThe Slim Desktop model has two external 5.25-inch drive bays that can house a numberof different types of drives. The computer also has an external diskette drive bay, locatedbelow and attached to the right 5.25-inch drive bay. There are two hard drive bays, onelocated below each external 5.25-inch drive bay.


2Standard 3.5-inch, third-height bay for optional hard drive


4 Standard 3.5-inch, third-height, standard, 1.44-MB diskette drive bay

5 Standard 3.5-inch, third-height, standard hard drive bay

Refer to Chapter 5, Connectors and Jumpers, for the location of the ribbon cableconnections on the system board.

4.15.1 Installing Additional Drives

CAUTION: When the computer is plugged into an AC power source, there is always voltageapplied to the system board. You must disconnect the power cord from the power source before


When installing additional drives, follow these guidelines:

! Use the green pull tabs to disconnect the diskette and hard drive cables from thedrives.

! For optimal performance, connect hard drives to the primary IDE controller.Connect expansion devices, such as IDE CD-ROM, tape, and diskette drives to thesecondary controller.

! You must install guide screws to ensure the drive will line up correctly in the drivecage. Compaq has provided extra guide screws, installed in the base of thecomputer chassis, next to the power supply. Some options use M3 metric threadhardware, such as CD-ROM drives. The Compaq-supplied metric screws are

black.


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4.15.2 Diskette Drive



1. Prepare the computer for disassembly (Section 4.2). 2. Remove access panel (Section 4.6). 3. Rotate the drive cage to the upright position (Section 4.14). 4. Disconnect the drive power cable and signal cable from the drive. 5. Pull the green drive release latch away from the drive 1. 6. Slide the drive out of the drive cage 2.



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4.15.3 Hard Drive

1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Rotate the drive cage to the upright position (Section 4.14). 4. Lift up to unlock the green drive release latch 1. 5. Slide the hard drive toward the center of the computer, then lift up the back of the hard

drive and pull the drive out of the drive cage2.

6. Disconnect the drive power cable and signal cable from the drive.



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4.16 System Board

More information on the system board, including troubleshooting criteria, can befound in the Compaq Quick Troubleshooting Guide (part number 153837-001) andthe Compaq Service Reference Guide (part number 152611-001).

WARNING: Power is continuous to the system board and power supply even when the power

switch is turned off. To prevent damage to the unit, disconnect the power cord from the powersource or the unit before beginning disassembly procedures.

1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Rotate the drive cage to the upright position (Section 4.14). 4. Remove all expansion boards (Section 4.11). 5. Remove all graphics cards (Section 4.12). 6. Disconnect all cables connected to the system board, noting their location for

reinstallation.

7. Remove the six screws connecting the system board to the chassis. 8. Slide the system board toward the front of the chassis until the external connectors areclear of the I/O panel.

9. Lift the system board out of the computer.

To install a system board, reverse the removal procedure.

When installing a system board, push the board toward the back of the computer,guiding the system board I/O through the holes in the I/O panel. At the same time,align the screw holes in the system board with the screw holes in the base pan.


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4.17 BatteryThe battery that comes with the computer provides power to the real-time clock and has alifetime of about three years. When replacing the battery, use the appropriate 3-voltlithium coin cell battery. To replace the battery:

1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Rotate the drive cage to the upright position (Section 4.14). 4. Lift the battery out of its holder.

5. Slide the replacement battery into position with the plus side up.The battery holder automatically secures the battery in the proper position.

6. Replace the access panel. 7. Plug in the computer and turn on power. 8. Use Computer Setup to relock the Smart Cover Lock, if applicable. 9. Reset the date, time, passwords, and any special system settings, using Compaq

Computer Setup.

If you previously saved your CMOS settings to a diskette with F10 setup, you canrestore these CMOS settings using F10 setup and the diskette with the saved CMOSconfiguration.

WARNING: This computer contains a lithium-ion battery pack. There is a risk of fire and chemical

burn if the battery pack is handled improperly. Do not disassemble, crush, puncture, short external

contacts, dispose in water or fire, or expose it to temperatures higher than 60C (140F).

In North America, dispose of nickel metal hydride or lithium-ion batteries by taking advantage of theCompaq battery recycling program. You will be provided with a postage-paid battery pack mailer

preaddressed to a reclamation facility where the metals are recycled. Call the telephone number

listed for your location in the Contacting Customer Supportguide for more information.

In Europe, do not dispose of batteries with general household waste. Dispose of or recycle them by

using the public collection system or returning them to Compaq, your authorized Compaq partners,

or their agents.


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4.18 Power Button/LED Board 1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Rotate the drive cage to the upright position (Section 4.14). 4. Disconnect the power cable from the system board 1. 5. Remove the two screws connecting the board to the chassis. 6. Remove the board from computer 2.

To install the power button/LED board, reverse the removal procedure.


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4.19 Hood Sensor 1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Rotate the drive cage to the upright position (Section 4.14). 4. Disconnect the power cable from the system board 1. 5. Push the sensor toward the front of the computer 2. 6. Pull the sensor down through the hole in which it sits to remove it from the chassis 3,

and lift it out of the computer.

To install the hood sensor, reverse the removal procedure.


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4.20 Processor Assembly 1. Prepare the computer for disassembly (Section 4.2).



2. Remove the access panel (Section 4.6).CAUTION: To reduce the risk of personal injury from hot surfaces, allow the internal systemcomponents to cool before touching.

3. Remove the heatsink retaining clip 1 by pressing down on the clips extended tab untilit releases from the safety catch.

4. Twist the heatsink2 slightly to break its adhesion to the processor and remove theheatsink from the processor.

5. Release the processor 3 from the socket by pulling the handle on the ZIF socket 4 outand upward.

6. Lift the processor out of the socket.

To install a processor, reverse the removal procedures.

If the heatsink has a thermal interface attached to its bottom, peel off theprotective paper before installing the heatsink.

All units with 800 MHz and faster processors require an active fansink. Wheninstalling the fan, make sure it is positioned so it blows down on the processor.

All units with 933 MHz and faster processors require the chassis fan assembly(Section 4.23). When properly installed, this fan blows air away from thecomputer.

CAUTION: Carefully remove the interface and all residue from the heatsink surface. Thermal

interface heat transmission is reduced if residue remains on the heatsink or the heatsink surface

is scratched.


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4.21 Speaker 1. Prepare the computer for disassembly (Section 4.2).

CAUTION: When the computer is plugged into an AC power source, there is always voltage

applied to the system board. You must disconnect the power cord from the power source before


2. Remove the access panel (Section 4.6). 3. Disconnect the speaker wire from the P6 connector located on the corner of the system

board near the battery 1.

4. Remove the four screws that connect the speaker to the chassis. 5. Remove the speaker.

To install the speaker, reverse the removal procedure.


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4.22 Power SupplyWARNING: Power is continuous to the system board and power supply even when the power



1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Disconnect all power cables from the mass storage devices and the system board. 4. Remove the four screws that connect the power supply to the chassis 1. 5. Slide power supply toward the front of the computer until it clears the notches in the

base pan 2.

6. Lift the power supply out of the computer3.

To install the power supply, reverse the removal procedure.


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4.23 Chassis Fan Assembly The chassis fan is only used with 933MHz or faster processors. When properly

installed, this fan blows air away from the computer.

1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.6). 3. Disconnect the fan power cable from the system board 1. 4. Press down on both tabs on the back of the fan 2. 5. From the front of the computer, slide the fan to the left until the hooks clear the notches

in the chassis 3.

6. Pull the fan assembly toward the front and then lift it out of the computer.

To install the fan, reverse the removal procedure.


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chapter5CONNECTORS AND JUMPERS

This chapter provides connect or, jumper, and switch information for system boardjumpers, system I/O board connectors, and hard drives for the Slim Desktop model.

5.1 System Board

5.1.1 Connectors and Jumpers

CR28 3.3V Aux LED P12 SOS Connector

CR29 3.3V Main LED (NI) P214 Hood Intrusion Sensor

CR31 Power Button LED (ON when pushed) P215 Hood Lock Solenoid Connector

CR32 5V Aux (ON)/PS_ON_LED (OFF) P10 Diskette Drive Connector

E49 Password Header (Installed =Enabled, Removed = Cleared)

P20 Primary IDE Connector

SW50 Clear CMOS P21 Secondary IDE Connector

P1 Power Supply Connector P70 CPU Fan

P5(pins 1-9) Power Button, Pwr LED and HD LEDConnector

P100 ITP Connector

P5(pins 10-11) SCSI LED Connector J20-24 PCI Slots

P6 Speaker Connector J40 AGP/AIMM Connector

P7 CD-ROM Audio XBT1 External Battery

P701 CD-ROM Audio XMM1-3 DIMM Memory Slots

P8 Chassis Fan Connector XU1 Primary Processor Socket


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5-2 Connectors and Jumpers

5.1.2 Clearing CMOS

The computer's configuration (CMOS) may occasionally be corrupted. If it does, it isnecessary to clear the CMOS memory using switch SW50.

To clear and reset the configuration, perform the following procedure:

1. Prepare the computer for disassembly (Section 4.2).CAUTION: The power cord must be disconnected from the power source before pushing the Clear

CMOS Button (NOTE: All LEDs on the board should be OFF). Failure to do so may damage the

system board.

2. Remove the access panel (Section 4.6). 3. Press the CMOS button located on the system board and keep it depressed for

5 seconds.

4. Replace the access panel. 5. Turn the computer on. 6. Run F10 Computer Setup (delete-utility) to reconfigure the system.


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5.1.3 Disabling or Clearing the Power-On and Setup Passwords 1. Turn off the computer and any external devices, and disconnect the power cord from

the power outlet.

2. Disconnect the keyboard, monitor, and any other external devices connected to thecomputer.

3. Remove the access panel. 4. Locate the header and jumper labeled E49. 5. Remove the jumper from pins 1 and 2. Place the jumper over pin 2 only, in order to

avoid losing it.

6. Replace the access panel. 7. Reconnect the external equipment. 8. Plug in the computer and turn on power. Allow the operating system to start. This clears

the current passwords and disables the password features.

9. To re-enable the password features, repeat steps 1-4, then replace the jumper on pins 1and 2.

10. Repeat steps 6-8, then establish new passwords.Refer to the Computer Setup (F10 Setup) instructions to establish new passwords.


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5.1.4 CMOS Archive and Restore (Power Switch Override)Each time the system starts, the system ROM saves a copy of NVRAM (including CMOS,passwords, and other system variables) in the flash ROM. Should the system becomeunstable, the last known good copy of NVRAM can be restored using a feature calledpower button override. To restore NVRAM, do the following:

1. With the unit powered down, press and release the power button. 2. Immediately after pressing the power button (during POST), press and hold the power

button until the unit powers down (about 4 seconds).

At the next startup, the ROM detects this power button override event and the backupcopy of NVRAM is restored.

Because of this feature, users cannot power off the computer immediately after poweringup. The video display must be active before the computer can be powered off.

CAUTION: Unplugging the power cord during POST can corrupt the splash screen. Flashing the

ROM is required to restore the splash screen, although the computer will continue to function.


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5.2 Hard Drive Jumper Settings

5.2.1 Seagate, Quantum, and Western Digital

The drawings and tables below apply to a number of different size drives in the followingparagraphs.

Seagate, Quantum, and Western Digital

Ultra ATA Hard Drive Jumper Settings

Definition Seagate Quantum Western DigitalSingle 7 - 8 1 - 2 and 3 - 5 3 - 5

Primary 5 - 6 and 7 - 8 1 - 2 and 3 - 5 5 - 6

Secondary No connection 3 - 5 3 - 4

Cable Select 5 - 6 2 - 4 and 3 - 5 1 - 2


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5.2.2 Maxtor

Maxtor Ultra ATA Hard Drive Jumper Settings

Definition J50 J48 J46 J44 J42

Single J

Primary (in a dual-drive system) J

Secondary O

Cable SelectDisabled*Enabled

OJ

4092 Cylinder LimitationDisabled*Enabled

OJ

Factory Reserved O

Factory Reserved O

* = Default settingJ = JumperO = No jumper


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chapter6SPECIFICATIONS

This chapter provides physical, environmental, and performance specifications for thecomputer, keyboard, and mass storage devices.

6.1 System

6.1.1 Specifications

DimensionsHeight

WidthLength

5.38 in

17.65 in17.11 in

13.67 cm

44.83 cm43.46 cm

Weight 26 lb 12 kg

Weight Supported (maximum distributed load) 100.0 lb 45.5 kg

Power Supply

Operating Voltage RangeRated Voltage RangeRated Line Frequency

90-132 VAC100-127 VAC50-60 Hz

180-264 VAC220-240 VAC50-60 Hz

Rated Input Current(maximum) 6 A 3 A

Power Output 200 W 200 W

Environmental Requirements

TemperatureOperatingShipping

50 to 95F-4 to 140F

10 to 35C-20 to 60C

Humidity (noncondensing)OperatingNonoperating

20 to 80%10 to 90%

20 to 80%10 to 90%

Maximum Altitude (unpressurized)OperatingNonoperating

10,000 ft30,000 ft

3048 m9144 m

Heat Dissipation

Maximum

Nominal1050 Btu/hr525 Btu/hr

265 kg-cal/hr133 kg-cal/hr


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6-2 Specifications

6.1.2 System Interrupts

Hardware IRQ System Function

0 Timer Interrupt

1 Keyboard

2 Interrupt Controller Cascade

3 Serial Port (COM B)

4 Serial Port (COM A)

5 Audio

6 Diskette Drive

7 Parallel Port (LPT 1)

8 Real-Time Clock

9 Available for PCI

10 Available for PCI

11 Available for PCI

12 Mouse

13 Coprocessor14 Primary IDE Controller

15 Secondary IDE Controller

6.1.3 System DMA

Hardware DMA System Function

0 Unused

1 Unused

2 Diskette Drive

3 ECP Parallel Port LPT1 (Default; Alternate = DMA 0)

4 DMA Controller Cascading

5 Unused

6 Unused

7 Unused


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6.1.4 ICH Fixed I/O Registers

Port Register Name

00h, 02h, 04h, 06h Channel 0, 1, 2, 3 DMA Base & Current Address Regsiter

C0h, C4h, C8h, CCh Channel 4, 5, 6, 7 DMA Base & Current Address Register

01h, 03h, 05h, 07h Channel 0, 1, 2, 3 DMA Base & Current Count Register

C2h, C6h, Cah, CEh Channel 4, 5, 6, 7 DMA Base & Current Count Register

10h-1Fh Aliased at 00h-0Fh

20h Master PIC ICW1 Init. Cmd Word 1 Register

Master PIC OCW2 Op Ctrl Word 2 Register


21h Master PIC ICW2 Init. Cmd Word 1 Register

Master PIC ICW3 Init. Cmd Word 1 Register

Master PIC ICW4 Init. Cmd Word 1 Register


24h-25h, 28-29h,2Ch-2Dh, 30h-31h,

34h-35h, 38h-39h,3Ch-3Dh

Aliased at 20h-21h

40h Counter 0 Interval Time Status Byte Format

Counter 0 Counter Access Port Register





43h Timer Control Word Register

Timer Control Word Register Read Back

Counter Latch Command

50h-53h Aliased at 40h-43h

61h NMI Status and Control Register

70h NMI Enable Register

Real-Time Clock (Standard RAM) Index Register

71h Real-Time Clock (Standard RAM) Target Register

72h Extended RAM Index Register

73h Extended RAM Target Register

74h-75h Aliased at 70h-71h

76h-77h Aliased at 72h-73h or 70h-71h

81h, 82h, 83h Channel 2, 3, 1 DMA Memory Low Page Register

84h-86h, 88h Reserved Page Registers89h, 8Ah, 8Bh Channel 6, 7, 5 DMA Memory Low Page Register

8CH-8Eh Reserved Page Registers

8Fh Refresh Low Page Register

91h-9Fh(except 92h)

Aliased at 81h-8Fh

92h Fast A20 and INIT Register

CF9h Reset Control Register

continued


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6-4 Specifications

ICH Fixed I

Documents

Computer Dis Assembly