Compaq EX, EXS User Manual
Maintenance &
Service Guide
Compaq Deskpro EX and Deskpro EXS
Series of Personal Computers
Minitower Models
Maintenance &
Service Guide
Compaq Deskpro EX and Deskpro EXS
Series of Personal Computers
Minitower Models
Notice
© 2000 Compaq Computer Co rp oration. Except for use in connect ion 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 Offi ce are t r 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 documentation accompan ying 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 and Deskpro EXS Series of P ersonal Computers
Minitower Models
First Edition (September 2000)
Part Number 201856-001
Spare Parts Number 215879-001
Compaq Computer Corporation
preface
About This Guide
Symbols and Conventions.........................................................................................................vii
Technician Notes.......................................................................................................................vii
Locating Additional Information .............................................................................................viii
chapter 1
Product Description
1.1 Computer 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 .................................................................................................................... 2-2
2.2 Mass Storage Devices..................................................................................................... 2-3
2.3 Cables ............................................................................................................................. 2-4
2.4 Standard, Memory, and Expansion Boards .................................................................... 2-5
2.5 Miscellaneous Plastics Kit.............................................................................................. 2-6
2.6 Keyboards (not illustrated)............................................................................................. 2-7
2.7 Miscellaneous Screw Kit (not illustrated)....................................................................... 2-7
2.8 Miscellaneous Parts (not illustrated)............................................................................... 2-8
2.9 Shipping Boxes (not illustrated)..................................................................................... 2-8
2.10 Documentation and Software (not illustrated)................................................................ 2-8
ONTENTS
C
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
Contents iii
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 and Replacement Procedures
4.1 Disassembly Sequence Chart.......................................................................................... 4-1
4.2 Disassembly Preparation................................................................................................. 4-2
4.3 Feet Installation .............................................................................................................. 4-3
4.4 Cable Lock...................................................................................................................... 4-4
4.5 Access Panel................................................................................................................... 4-5
4.6 Front Bezel ..................................................................................................................... 4-6
4.7 Power Button.................................................................................................................. 4-7
4.8 Subpanel and Bezel Blanks............................................................................................. 4-8
4.9 Power Switch Assembly................................................................................................. 4-9
4.10 Mass Storage Devices................................................................................................... 4-10
4.10.1 Removing an Internal 3.5-Inch Hard Drive ..................................................... 4-12
4.10.2 Removing an External 5.25-Inch Drive........................................................... 4-13
4.10.3 Removing an External 3.5-Inch Drive............................................................. 4-14
4.11 Expansion Boards......................................................................................................... 4-16
4.11.1 Expansion Board Slots..................................................................................... 4-16
4.11.2 Removing a PCI Expansion Board................................................................... 4-17
4.11.3 Installing a PCI Expansion Board.................................................................... 4-18
4.12 System Memory............................................................................................................ 4-20
4.13 Graphics Cards..............................................................................................................4-22
4.13.1 Graphics Performance Accelerator (GPA)/AGP Inline Memory
Module (AIMM) Card with a Type I Retention Mechanism.................................... 4-22
4.13.2 AGP Card with a Type I Retention Mechanism............................................... 4-25
4.13.3 GPA/AIMM Card with a Type 2 Retention Mechanism.................................. 4-26
4.13.4 AGP Card with a Type 2 Retention Mechanism.............................................. 4-27
4.13.5 Standard AGP Expansion Card........................................................................ 4-28
4.14 Processor....................................................................................................................... 4-29
4.15 System Board................................................................................................................4-31
4.16 Battery .......................................................................................................................... 4-32
4.17 Chassis Fan Assembly.................................................................................................. 4-33
4.18 Power Supply................................................................................................................4-34
chapter 5
Connectors & Jumpers
iv Contents
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 Keyboard.......................................................................................................... 6-9
6.4 Scroll 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
index ..............................................................................................................................................
I-1
Contents v
preface
BOUT THIS GUIDE
A
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
Minitower Model. Only authorized technicians trained by Compaq should attempt to
repair this equipment.
Compaq Computer Corporation reserves the right to make changes to the 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
• Disconnect the power from the computer by unplugging the power cord either from the
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.
times.
electrical outlet or the computer.
Compaq Deskpro EX and Deskpro EXS Series of Personal Computers vii
Locating Additional Information
The following documentation is availab le to suppo rt the se produc ts :
■ 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
1
RODUCT DESCRIPTION
P
This chapter describes the model offerings and features of the Compaq Deskpro EX Series
of Personal Computers Minitower Model.
Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 1-1
1.1 Computer Features
Compaq Deskpro EX Series of Personal Computers Minitower 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
Stereo Headphone Jack*
1
Headphone Volume Control*
2
Diskette Drive Activity Light
3
Dual-State Power Button
4
Power-On Light
5
*CD-ROM models only.
**Flashes when an ATAPI device, such as the hard drive, is active.
1-2 Product Description
6
7
8
9
CD-ROM Eject Button*
CD-ROM Drive Busy Indicator*
Diskette Eject Button
Drive Activity Light**
1.1.2 Rear Panel Connectors
Ref. Component Ref. Component
Mouse Connector
1
Keyboard Connector
2
Universal Serial Bus (USB)
3
Connectors (2) (connects the
computer to any USB peripheral
while the computer is operating; is
a fully functional plug and play
connector)
Serial Connector
4
Parallel Port Connector
5
6
7
8
9
:
Monitor Connector
Headphone/Line-Out Audio Connector
Serial Connector
Line-In Audio Connector
Microphone Connector
Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 1-3
1.1.3 Drive Positions
Reference Drive Bay Configuration
1, 2
3
4, 5
1, 2 Two standard 5.25-inch, half-height bays for optional drives
3
4, 5
One standard 3.5-inch, 1.44-MB diskette drive mounted with a drive
adapter into a 5.25-inch bay
Two standard 3.5-inch drive bays; Bay 4 contains the preinstalled hard
drive; Bay 5 is available for an optional hard drive
Drive bay numbers are stamped on the chassis.
To verify the type and size of the mass storage devices installed in the computer, run F10
Compaq Computer Setup.
1-4 Product Description
1.2 Serial Number Location
The serial number and model information label is located on the access panel of the
unit 1. A second barcode 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.
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.
The computer serial number should be provided to Compaq when requesting information
or ordering spare parts.
Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 1-5
chapter
PARE PARTS
S
2
Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 2-1
2.1 System Unit
Spare Part
Description
1 Access panel Not spared
2 Front bezel 166868-001 B
3 Chassis/basepan Not spared
4 Logo Kit (only minitower version-166806-002-used) 166924-001 B
5 Power switch with cable, LED and switch holder 199854-001
6 Feet Misc Plastics Kit B
7 Power supply 201828-001 B
Number
Warranty
Tier
2-2 Spare Parts
2.2 Mass Storage Devices
Spare Part
Description
1 Diskette drive, 3.5-inch 158266-001 D
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
Number
Ultra ATA/100 hard drives are backwards compatible with Ultra ATA/66
devices; however, the data transfer rate is reduced to 66MB/sec.
Warranty
Tier
Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 2-3
2.3 Cables
Spare Part
Description
Number
Cable Kit includes: 192264-001
1 Single device, hard drive/CD-ROM cable, 18”
(108950-019)
2 Audio cable, 21” (387527-001)
* Single device, hard drive/CD-ROM cable, 12.5”
(105876-001)
* Audio cable, 21”, (288489-002) (not used for this
product)
3 Single device, hard drive/CD-ROM cable, 9.75”
(108950-021)
4 Dual device, hard drive/CD-ROM cable, 18”, 10” to the first
connector
5 Power switch/LED cable 199854-001 B
6 Diskette drive cable 161735-001 B
* CD audio cable 149806-001 D
*Not shown
196667-001 B
Warranty
Tier
B
2-4 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 for graphics 192012-001 B
Memory Module (SDIMM, 133 MHz)
2 128 MB 170081-001 B
256 MB 192014-001 B
Intel Pentium III Processor
3 566/66 MHz with heatsink (191832-002) and clip (223575-007). 203967-001 B
* 600/66 MHz with heatsink (191832-002) and clip (223575-007). 192011-001 B
* 667/133 MHz with heatsink (191832-002) and clip (223575-007). 192007-001 B
* 700/66 MHz with heatsink (191832-002) and clip (223575-007). 203968-001 B
* 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 and Deskpro EXS Series of Personal Computers 2-5
2.5 Miscellaneous Plastics Kit
Spare Part
Description
Number
Miscellaneous Plastics Kit, includes: 166878-001 B
1 Panel, sub (166835-001)
2 Bezel, blank (166775-001)
3 Diskette bezel (166776-001)
4 Card guide (166778-001)
5 Foot, rubber (4 ea.) (166939-002)
6 Button, power (166774-001)
7 Drivelock, DT (166779-001) (not used with this product)
8 Spring, power button (166837-001)
9 Springs, drivelock (2 ea.) (166837-002)
10 Drivelock, MT (166780-001)
* Retention mechanism (2 ea.) (350767-001)
*Not shown
Warranty
Tier
2-6 Spare Parts
2.6 Keyboards (not illustrated)
Description
Easy Access Keyboard-US 123130-xxx D
Dutch -331
Finnish -351
French -051
International -B31
Norwegian -091
Spanish -071
Swedish -101
UK -031
US -001
2.7 Miscellaneous Screw Kit (not illustrated)
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
Spare Part
Number
Warranty
Tier
Warranty
Tier
Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 2-7
2.8 Miscellaneous Parts (not illustrated)
Description
Mouse – Scroll, Opal 334689-002 D
2.9 Shipping Boxes (not illustrated)
Description Spare Part Number
Return Kit 166990-002
2.10 Documentation and Software (not illustrated)
Description Spare Part Number
Maintenance & Service Guide 215879-001
Illustrated Parts Map 215880-001
Service Reference Guide 152611-001
Quick Troubleshooting Guide 153837-001
Spare Part
Number
Warranty
Tier
2-8 Spare Parts
chapter
3
EMOVAL
R
& 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 and Deskpro EXS 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 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 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 and Deskpro EXS Series of Personal Computers 3-3
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