Hp Compaq Deskpro EX, Deskpro EX Maintenance & Service Guide

Maintenance & Service Guide

Compaq Deskpro EX Series of Personal Computers

Desktop Models

Maintenance & Service Guide

Compaq Deskpro EX Series of Personal Computers

Desktop Models

Notice

© 2000 Compaq Computer Co rp oration. Except for use in connecti on with the accompanying Compaq product, no part of this guide may be photocopied or reproduced in any form without prior written consent from Compaq Computer Corporation.

COMPAQ, the Compaq logo, and Deskpro Registered in U.S. Patent and Trademark Office are tr ademarks of Compaq Information Technologies Group, L.P.

Microsoft, Windows, Windows NT, and other names of Microsoft products referenced herein are trademarks or registered trademarks of Microsoft Corporation.

Intel and Pentium are registered trademarks of Intel Corporation. Celeron and MMX are trademarks of Intel Corporation. All other product names mentioned herein may be trademarks or registered trademarks of their respective companies. Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information in this document

is subject to change without notice. THE INFORMATION IN THIS PUBLICATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.

THE ENTIRE RISK ARISING OUT OF THE USE OF THIS INFORMATION REMAINS WITH RECIPIENT. IN NO EVENT SHALL COMPAQ BE LIABLE FOR ANY DIRECT, CONSEQUENTIAL, INCIDENTAL, SPECIAL, PUNITIVE OR OTHER DAMAGES WHATSOEVER (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS, BUSINESS INTERRUPTION OR LOSS OF BUSINESS INFORMATION), EVEN IF COMPAQ HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND WHETHER IN AN ACTION OF CONTRACT OR TORT, INCLUDING NEGLIGENCE.

The limited warranties for Compaq pro ducts are exclusively set forth in the docu mentation accompanying such products. Nothing herein shou l d be con strued as constituting a further or additional warranty.

The following words and symbols mark special messages throughout this guide:

WARNING:

to follow directions could result in bodily harm or loss of life.

CAUTION:

follow directions could result in damage to equipment or loss of information.

Text set off in this manner indicates that failure

Text set off in this manner indicates that failure to

Maintenance & Service Guide

Compaq Deskpro EX Series of Personal Computers Desktop Models

First Edition (September 2000) Part Number 201855-001 Spare Parts Number 215877-001

Compaq Computer Corporation

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.................................................................................................. 1-5

chapter 2

Spare Parts

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

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

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

2.4 Standard, Memory, and Expansion Boards .................................................................... 2-3

2.5 Keyboards....................................................................................................................... 2-4

2.6 Miscellaneous Screw Kit................................................................................................ 2-4

2.7 Miscellaneous Parts........................................................................................................ 2-5

2.8 Shipping Boxes...............................................................................................................2-5

2.9 Documentation and Software ......................................................................................... 2-5

ONTENTS

chapter 3

Removal and 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................................................................................................................... 3-3

3.2.1 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

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

Contents iii

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

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

chapter 4

Removal and Replacement Procedures

4.1 Disassembly Sequence Chart.......................................................................................... 4-1

4.2 Disassembly Preparation................................................................................................. 4-2

4.3 Computer Cover ............................................................................................................. 4-3

4.4 Front Bezel ..................................................................................................................... 4-4

4.5 Bezel Blank..................................................................................................................... 4-5

4.6 Power Switch/LED Cable............................................................................................... 4-6

4.7 Mass Storage Devices..................................................................................................... 4-7

Using the Cable-Select Feature with Ultra ATA Devices........................................... 4-7

4.7.1 Removing the Internal, Side-Mounted, 3.5-Inch Hard Drive............................. 4-8

4.7.2 Removing an External 5.25-Inch Drive from Right Drive Bay....................... 4-10

4.7.3 Removing the Diskette Drive........................................................................... 4-11

4.7.4 Removing an External 5.25-Inch Drive from the Left Drive Bay.................... 4-12

4.8 System Memory............................................................................................................ 4-13

DIMMs ......................................................................................................................... 4-13

Memory Module Installation........................................................................................ 4-13

4.9 Expansion Boards......................................................................................................... 4-15

4.9.1 Expansion Slot Location.................................................................................. 4-15

4.9.2 Removing or Installing a PCI Expansion Board.............................................. 4-15

4.10 Graphics Cards..............................................................................................................4-17

4.10.1 Graphics Performance Accelerator (GPA)/AGP Inline Memory

Module (AIMM) Card with a Type I Retention Mechanism.................................... 4-17

Removing a GPA/AIMM Card................................................................................. 4-17

Installing a GPA/AIMM Card................................................................................... 4-18

4.10.2 AGP Card with a Type I Retention Mechanism............................................... 4-20

Removing an AGP Card............................................................................................ 4-20

4.10.3 GPA/AIMM Card with a Type 2 Retention Mechanism.................................. 4-21

Removing a GPA/AIMM Card................................................................................. 4-21

4.10.4 AGP Card with a Type 2 Retention Mechanism.............................................. 4-22

Removing an AGP Card............................................................................................ 4-22

4.10.5 Standard AGP Expansion Card........................................................................ 4-23

Removing an AGP Card............................................................................................ 4-23

4.11 Processor....................................................................................................................... 4-24

4.12 System Board................................................................................................................4-26

4.13 Battery .......................................................................................................................... 4-27

4.14 Power Supply................................................................................................................4-28

4.15 Chassis Fan................................................................................................................... 4-29

iv Contents

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

5.2 Hard Drive Jumper Settings............................................................................................ 5-4

5.2.1 Seagate, Quantum, and Western Digital ............................................................ 5-4

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

chapter 6

Specifications

6.1 Specifications.................................................................................................................. 6-1

6.1.1 System................................................................................................................ 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......................................................................................... 6-5

6.2 Drives.............................................................................................................................. 6-6

6.2.1 1.44-MB Diskette Drive..................................................................................... 6-6

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

6.2.3 CD-ROM Drives................................................................................................ 6-8

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

6.4 Mouse ............................................................................................................................. 6-9

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

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

6.5.2 nVIDIA M64 Pro ............................................................................................. 6-10

6.5.3 Vanta LT.......................................................................................................... 6-10

Index

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

Contents v

preface

BOUT THIS GUIDE

This Maintenance & Service Guide is a troubleshooting and repair guide that can be used for reference when servicing the Compaq Deskpro EX 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 these models 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.

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

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

outlet or the computer.

Compaq Deskpro EX Series of Personal Computers vii

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 Quick Reference Guide

■ Compaq Service Reference Guide

■ Compaq Quick Troubleshooting Guide

viii About This Guide

chapter

RODUCT DESCRIPTION

This chapter describes the model offerings and features of the desktop model of the Compaq Deskpro EX Series of Personal Computers.

Compaq Deskpro EX Series of Personal Computers 1-1

1.1 Product Features

Compaq Deskpro EX Series of Personal Computers Desktop Model ships with a mouse and keyboard. Some models are also equipped with a CD-ROM drive. A Compaq color monitor or other compatible monitor does not ship with the computer.

1.1.1 Front Panel Controls and LEDs

Ref. Component/Function Ref. Component/Function

Dual-State Power Button

Power-On Light

Drive Activity Light**

Stereo Headphone Jack

Headphone Volume Control

*CD-ROM models only. **Flashes when an ATAPI device, such as the hard drive, is active.

CD-ROM Drive Busy Indicator* CD-ROM Eject Button* Diskette Drive Activity Light Diskette Eject Button

1-2 Product Description

1.1.2 Rear Panel Connectors

Ref. Component Ref. Component

Mouse Connector

Keyboard Connector

Universal Serial Bus (USB)

Connectors (2) (connects the computer to any USB peripheral while the computer is operating; is a fully functional Plug and Play connector)

Serial Connector

Parallel Port Connector

Monitor Connector Headphone/Line Out Audio Connector Serial Connector

Line-In Audio Connector Microphone Connector

Compaq Deskpro EX Series of Personal Computers 1-3

1.1.3 Drive Positions

Reference Configuration

To verify the type and size of the mass storage devices installed in the computer, run F10 Compaq Computer Setup.

Two standard 5.25-inch, half-height bays for optional drives One standard 3.5-inch, 1.44-MB diskette drive One standard 3.5-inch, side mounted hard drive

1-4 Product Description

1.2 Serial Number Location

The serial number and model information label is located on the side of the unit 1. A second label is located on the rear of the unit 2.

For the purpose of AssetControl, the serial number is embedded in CMOS and in the EEPROM on the system board and may be accessed through Diagnostics for Windows.

✎

The computer serial number should be provided to Compaq when requesting information or ordering spare parts.

If the system board is replaced with a spare part from Compaq, the invalid serial number condition will be recognized during POST. The original serial number must then be reentered through Computer Setup. Refer to the Software Reference Guide for more information.

CAUTION: A system board borrowed from another computer is recognized as a valid serial number and will create a mismatch between the serial number label and the electronic serial number.

Compaq Deskpro EX Series of Personal Computers 1-5

chapter

PARE PARTS

The chapter provides an illustrated parts breakdown and a reference for spare parts for the desktop model.

2.1 System Unit

Spare Part

Description

1 Computer cover Not spared 2 Chassis/basepan Not spared 3 Power supply 201829-001 B 4 Front bezel 213434-001 D

Compaq Deskpro EX Series of Personal Computers 2-1

Number

Warranty Tier

2.2 Mass Storage Devices

Description

1 Diskette drive, 3.5-inch, buttonless, opal 210795-001 B

2 48X Max tray load IDE CD-ROM drive 187263-001 B

3 10.0-GB Ultra ATA hard drive (66/5400) quiet 203139-001 B

* 15.0-GB Ultra ATA hard drive (66/5400) 202903-001 B

*Not shown (nn/nnnn) = hard drive transfer rate (MBytes/sec)/RPM

✎

2.3 Cables

Description

1 LED/power cable, 21” 222039-001 D

2 CD audio cable 149806-001 D

3 Dual connection cable, CD/hard drive, 18” 215392-001 D

4 Diskette drive cable, 15.5” 161735-001 D

*Not shown

Spare Part Number

Warranty Tier

Ultra ATA/100 hard drives are backwards compatible with Ultra ATA/66 devices; however, the data transfer rate is reduced to 66MB/sec.

Spare Part Number

Warranty Tier

2-2 Spare Parts

2.4 Standard, Memory, and Expansion Boards

Spare Part

Description

1 Nvidia M64 16MB SDRAM AGP Card 182757-001 B 5 AIMM (GPA) 4MB, 133MHz Graphics Card 192012-001 B

* Vanta LT 8MB SDRAM Graphics Card 201827-001 B * Mitac/Nvidia NV-15, 32MB Graphics Card 180284-001 B

Memory Module (SDIMM, 133 MHz)

2 64 MB 170080-001 B

* 128 MB 170081-001 B * 256MB 192014-001 B

Intel Pentium III Processor 3 566/66 MHz with heatsink (191832-002) and clip (223575-007) 203967-001 B 3 600/66 MHz with heatsink (191832-002) and clip (223575-007) 192011-001 B 3 667/133 MHz with heatsink (191832-002) and clip (223575-007)192007-001 B 3 700/66 MHz with heatsink (191832-002) and clip (223575-007) 203968-001 B 3 733/133 MHz with heatsink (191832-002) and clip (223575-007)192008-001 B

* 800/133 MHz with heatsink (191832-002) and clip (223575-007)192009-001 B *

866/133 MHz with fansink (191845-002). Fansink includes fan, heatsink, and clip.

* 933/133 MHz with fansink (191845-002). Fansink includes fan,

heatsink, and clip. 4 10/100 PCI Network Interface Card 188297-001 B 6 System Board 203966-001 B

*Not shown.

Number

192006-001 B

203969-001 B

Warranty Tier

Compaq Deskpro EX Series of Personal Computers 2-3

2.5 Keyboards

Description

Easy Access Keyboard-US 123130-xxx D Spacesaver, Opal 269513-xxx D Dutch -331 Finnish -351 French -051 International -B31 Norwegian -091 Spanish -071 Swedish -101 UK -031 US -001

2.6 Miscellaneous Screw Kit

Description

Miscellaneous Screw Kit, includes : 179180-001 D

6-32 x 1/4 hi-top, thread-forming screw with serrations (5 ea.) (192308-001)

6-19 x 5/16 panhead, plastite screw (4 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 (4 ea.)

(247348-001) 6-32 x 3/16 buttonhead tamper-resistant, taptite screw with

serrations (3 ea.) (296769-002) 6-32 x 5/16 hi-top, taptite screw (4 ea.) (109834-568) 6-19 x 1/2 Panhead, plastite screw (5 ea.) (101346-071) Thumbscrew, molded cap (4 ea.) (179333-002)

Spare Part Number

Warranty Tier

2-4 Spare Parts

2.7 Miscellaneous Parts

Description

Mouse, scroll, opal 334689-002 D Mouse, two-button, opal 166861-001 D

2.8 Shipping Boxes

Description

Return Kit 207742-001

2.9 Documentation and Software

Description

Maintenance & Service Guide 215877-001 Illustrated Parts Map 215878-001 Service Reference Guide 152611-001 Quick Troubleshooting Guide 153837-001

Spare Part Number

Warranty Tier

Compaq Deskpro EX Series of Personal Computers 2-5

chapter

EMOVAL

& R

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

EPLACEMENT PRELIMINARIES

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, but damage occurs. An electronic device exposed to electrostatic discharge (ESD) may not be affected at all and can work perfectly throughout a normal cycle. The device may function normally for a while, then degrade in the internal layers, reducin g its life expec tan cy.

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.

Compaq Deskpro EX Series of Personal Computers 3-1

3.1.2 Preventing Electrostatic Damage to Equipment

Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of sensitivity. The following proper packaging and grounding precautions 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 approved

containers or packaging. Keep electrostatic sensitive parts in their containers until they arrive at static-free

stations.

! 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 worn snug against bare skin. The ground cord must be connected and fit snugly into the banana plug connector on the grounding mat or workstation.

Heel straps/Toe straps/Boot str a ps can be used at standing workst at ions and are

compatible with most types of shoes or boots. On conductive floors or dissipative floor 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 wrist

strap 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 test

equipment.

3-2 Removal & Replacement Preliminaries

! Use fixtures made of static-safe materials when fixtures must directly contact

dissipative surfaces.

! Keep work area free of nonconductive materials such as ordinary plastic assembly

aids and Styrofoam.

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

conductive.

3.1.5 Recommended Materials and Equipment

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

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 floo r ma ts with hard ti e 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 metall ized shi eld ing 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 clean

cloth 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.

Compaq Deskpro EX Series of Personal Computers 3-3

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 the

alcohol 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 in

Section 3.2.2. When cleaning debris from under the keys, review all rules in Section 3.2.1 before

following 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 or

shaking.

! Canned, pressurized air may be used to clean debris from under the keys. Caution

should 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 alcohol

and squeezed out. Be careful not to wipe away lubricants necessary for proper key functions. Use tweezers to remove any fibers or dirt in confined areas. Allow the parts 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 on the screen, the liquid may seep into the housing and damage a component. Never use solvents or flammable liq uid s on the monito r.

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

3-4 Removal & Replacement Preliminaries

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