Dell OptiPlex GX1 User manual

Contents: Dell OptiPlex GX1 Small-Form-Factor Systems Service Manual
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Dell™ OptiPlex™ GX1 Small-Form-Factor Systems Service Manual
Removing and Replacing Parts
Notes, Notices, and Cautions
Throughout this guide, blocks of text may be accompanied by an icon and printed in bold type or in italic
type. These blocks are notes, notices, and cautions, and they are used as follows:
NOTE: A NOTE indicates important information that helps you make better use of your system.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you
how to avoid the problem.
CAUTION: A CAUTION indicates a potentially hazardous situation which, if not avoided, may
result in minor or moderate injury.
Information in this document is subject to change without notice.
© 1999 Dell Computer Corporation. All rights reserved.
Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.
Trademarks used in this text: Dell, OptiPlex, and the DELL logo are trademarks of Dell Computer Corporation; Microsoft, MS-
DOS, and Windows NT are registered trademarks of Microsoft Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or
their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.
Initial release: Jun 1999

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Back to Contents Page
Removing and Replacing Parts: Dell™ OptiPlex™ GX1 Small-
Form-Factor Systems Service Manual
Overview System Power Supply
Recommended Tools Riser Board
Precautionary Measures System Board Components
Internal Views Expansion-Card Cage
Computer Cover Expansion Cards
Eject and Power Buttons DIMMs
Control Panel Microprocessor/Heat Sink Assembly
Chassis Intrusion Switch System Battery
Drives System Board
Overview
This section provides procedures for removing and replacing the components, assemblies, and
subassemblies in the Dell OptiPlex small-form-factor chassis GX1 system.
Unless otherwise noted, each procedure assumes that the following conditions exist:
You have performed the steps in "Precautionary Measures."
You have removed the computer cover.
You can replace or reinstall a part by performing the removal procedure in reverse order unless
additional information is provided.
Recommended Tools
Most of the procedures in this manual require the use of one or more of the following tools:
#1 and #2 Phillips-head screwdrivers
1/4-inch nut driver
Also, use a wrist grounding strap as explained in "Precautionary Measures."

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Precautionary Measures
Before you perform any procedures in this manual, take a few moments to read the following caution for your
personal safety and to prevent damage to the system from ESD.
CAUTION: FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT
Before you start to work on the system, perform the following steps in the sequence listed:
1. Turn off the computer and all peripherals.
2. Disconnect the computer and peripherals from their AC power sources. Also, disconnect any
telephone or telecommunication lines from the computer. Doing so reduces the potential for
personal injury or shock.
3. If you are disconnecting a peripheral from the computer or are removing a component from the
system board, wait 10 to 20 seconds after disconnecting the computer from AC power before
disconnecting the peripheral or removing the component to avoid possible damage to the
system board.
4. Wear a wrist grounding strap, and clip it to an unpainted metal surface, such as the padlock loop
on the back of the chassis. If a wrist grounding strap is not available, touch any unpainted metal
surface on the back of the computer or on the computer chassis, such as the power supply, to
discharge any static charge from your body before touching anything inside the computer.
While you work, periodically touch an unpainted metal surface on the computer chassis to
dissipate any static electricity that might harm internal components. Also avoid touching
components or contacts on a card and avoid touching pins on a chip.
5. Verify that the auxiliary power indicator on the riser board is not on. If it is on, you may need to
wait 10 to 30 seconds for it to go out (see Figure 20).
Internal Views
Figure 1 shows a top view of the chassis to help you orient yourself when you work inside the computer.
Figure 1. Orientation View
1System board
2Diskette drive
3Hard-disk drive
4CD-ROM drive
5Power supply

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Figure 2 shows the chassis with the cover removed.
Figure 2. Inside the Chassis
1CD-ROM drive interface cable
2Externally accessible upper drive
bay
3Hard-disk drive
4Diskette-drive interface cable
5Hard-disk drive interface cable
6Expansion-card cage
7System board
8Expansion-card slots
9I/O ports and connectors
10 AC power receptacle
11 Security cable slot
12 Power supply
13 Chassis intrusion switch
Computer Cover
Figure 3. Computer Cover Removal

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To remove the computer cover, perform the following steps:
1. Be sure the padlock ring is pushed into the cover.
2. Press in on the two securing buttons until the cover is free to swing up (see Figure 3).
3. Raise the back of the cover, and pivot it toward the front of the computer.
4. Lift the cover off the hooks at the front of the chassis.
5. Disengage the tabs that secure the cover to the top of the chassis, and lift the cover away.
Figure 4. Computer Cover Replacement

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To replace the computer cover, perform the following steps:
1. Face the front of the computer and hold the cover at a slight angle (see Figure 4).
2. Align the bottom of the cover with the bottom of the chassis and insert the hooks on the cover into the
recessed slots on the computer chassis so that the tabs catch the hooks inside the slots.
3. Pivot the cover down toward the back of the chassis and into position.
Make sure that the securing buttons click into place.
Eject and Power Buttons
Figure 5. Eject and Power Button Removal
1Diskette eject button
2Power button
To remove the eject and power buttons, perform the following steps:

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1. Lay the computer cover on a flat work surface, with the inside of the top cover facing up.
2. To remove the 3.5-inch diskette-drive eject button, pull gently on the plastic part of the button until it
comes free.
3. To remove the power button, use a small screwdriver and push in the two plastic clips that hold the
button to the bezel. When these clips are released, the button and the spring come free from the bezel.
Control Panel
Figure 6. Control Panel Removal
1Screw
2Control panel
To remove the control panel, perform the following steps:
1. Remove the drive shelf.
2. Remove the power supply.
3. Disconnect the control panel cable from the control panel connector on the system board (see "System
Board Labels" for the location of the PANEL connector).
Note the routing of the control panel cable as you remove it from the chassis.
4. Remove the mounting screw that secures the control panel to the chassis.
5. Disconnect the chassis intrusion switch cable connector from the control panel.
6. Remove the control panel cable.
7. Remove the control panel from the chassis.
Note the routing of the control panel cable as you remove it from the chassis.

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When you install the replacement control panel, be sure to put the right side of the control panel behind the
mounting tab.
Chassis Intrusion Switch
Figure 7. Chassis Intrusion Switch Removal
1Control panel
2Chassis intrusion
switch
To remove the chassis intrusion switch, perform the following steps:
1. Remove the drive shelf.
2. Remove the power supply.
3. Remove the control panel.
4. Disconnect the chassis intrusion switch cable connector from the control panel.
Note the routing of the chassis intrusion cable as you remove the cable from the chassis. Chassis
hooks may hold the cable in place inside the chassis.
5. Slide the chassis intrusion switch out of its slot and remove the switch and its attached cable from the
chassis.
6. Install the replacement chassis intrusion switch and cable.
7. To reset the chassis intrusion detector, enter the System Setup program and reset Chassis Intrusion
to Not Detected (see your online System User's Guide for instructions).
Drives

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NOTE: In all of the following procedures, left and right refer to your left and right as you face the front
of the computer.
Figure 8. Drive Locations
1Chassis intrusion switch
2CD-ROM drive
33.5-inch diskette drive
4Hard-disk drive
Preliminary Steps
You must remove the drive shelf before removing the 3.5-inch diskette drive, the CD-ROM drive, the hard-
disk drive, the control panel, the chassis intrusion switch, or the power supply.
Figure 9. Drive Shelf Removal
1Drive shelf
2Release tabs (2)
To remove the drive shelf from the chassis, perform the following steps:
1. Disconnect the power and interface cables from the diskette drive and CD-ROM drive.
2. Press inward on the two drive shelf release tabs, and pull the shelf forward and out of the chassis (see

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Figure 9).
Hard-Disk Drive
Figure 10. Hard-Disk Drive/Bracket Removal
1Drive bracket
2Release tabs (2)
CAUTION: To avoid the possibility of electric shock, turn off the computer and any peripherals,
disconnect them from electrical outlets, and then wait at least 5 seconds before you remove
the computer cover. Also, before you remove a drive, see the other precautions in
"Precautionary Measures."
To remove the hard-disk drive and its bracket from the chassis, perform the following steps:
1. If you are replacing a hard-disk drive that contains data you want to keep, make a backup copy of your
files before you continue this procedure.
2. Remove the computer cover if not already removed.
3. Remove the drive shelf.
4. Squeeze the tabs on each side of the hard-disk drive/bracket, and pull the hard-disk drive/bracket
forward about one inch (see Figure 10).
5. Disconnect the power and interface cables from the back of the drive.
6. Lift the hard-disk drive/bracket away from the chassis.
7. Lay the hard-disk drive/bracket on an antistatic surface with its bracket facing up.
8. Remove the four screws securing the hard-disk drive to the bottom of the bracket (see Figure 11).
Figure 11. Drive Bracket Removal

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1Drive
2Drive bracket
3Screws (4)
Figure 12. Hard-Disk Drive/Bracket Replacement
1Tabs on bottom of drive
bracket
2Hooks on chassis floor
3Drive bracket
4Release tabs (2)
To install a replacement hard-disk drive in the chassis, perform the following steps.
CAUTION: To avoid the possibility of electric shock, turn off the computer and any peripherals,
disconnect them from electrical outlets, and then wait at least 5 seconds before you remove
the computer cover. Also, before you install a drive, see the other precautions in
"Precautionary Measures."
NOTICE: To avoid possibly damaging the drive by electrostatic discharge (ESD), ground yourself by
touching an unpainted metal surface on the back of the computer.
NOTICE: When you unpack the drive, do not set it on a hard surface, which may damage the drive.
Instead, set the drive on a surface, such as a foam pad, that will sufficiently cushion it.
1. Prepare the drive for installation.

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Check the documentation for the drive to verify that it is configured for your computer system.
2. If not already done, remove the computer cover.
3. If not already done, remove the drive bracket from the chassis.
4. Attach the new hard-disk drive to the bracket with the four screws you removed in step 8 of the
previous procedure.
5. Reinstall the hard-disk drive/bracket in the chassis (see Figure 12).
6. Place the bracket so that the release tabs extend about one inch past the front of the chassis, and
align the tabs on the bottom of the bracket with the hooks on the chassis floor.
7. Slide the bracket toward the back of the chassis until the tabs snap under the hooks (see Figure 12).
The bracket release tabs should also snap into the front of the chassis.
8. Connect a power cable to the power input connector on the back of the drive, and connect an EIDE
cable to the interface connector on the back of the drive (see Figure 13).
Check all connectors to be certain that they are properly cabled and firmly seated.
Figure 13. Hard-Disk Drive Cable Attachment
1IDE1 connector
2EIDE cable
3Power cable
NOTICE: You must connect the blue connector on the EIDE interface cable to the IDE1 connector on
the system board to avoid possible damage to your system.
NOTICE: You must match the red-colored stripe on the EIDE cable with pin 1 on the drive's interface
connector to avoid possible damage to your system.
NOTICE: You must match the red-colored stripe on the EIDE interface cable with pin 1 on the IDE1
connector to avoid possible damage to your system.
9. If it is not already connected, connect the blue connector on the EIDE interface cable to the IDE1
connector on the system board.

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To locate the IDE1 connector on the system board, see "System Board Components."
10. Replace the drive shelf and connect the diskette and CD-ROM drive power and interface cables.
11. Replace the computer cover. Then reconnect your computer and peripherals to their electrical outlets,
and turn them on.
12. Insert a bootable diskette into drive A.
13. Turn on the computer system.
14. Enter the System Setup program and update Primary Drive 0 (see the online System User's Guide for
complete information on the System Setup program).
After you update the system setup settings, reboot the system.
15. Partition and logically format your computer's hard-disk drive before proceeding to the next step.
See the documentation for your operating system for instructions.
NOTE: On systems with hard-disk drives larger than 2 GB, create a primary partition of 2
GB and divide the remaining capacity into partitions of 2 GB or less. For example, a
system with a 2.5-GB hard-disk drive would have a primary partition of 2 GB (drive C) and
a second partition of 500 MB (drive D). Hard-disk drives must be partitioned this way
because MS-DOS®–based operating systems (including Microsoft® Windows NT®, when
using a FAT16 file system) do not support drive partitions larger than 2 GB.
16. Test the hard-disk drive by running the Dell Diagnostics (see the online System User's Guide for
complete information).
17. If the drive you just installed is the primary drive, install your operating system on the hard-disk drive.
For instructions, refer to the documentation that came with your operating system.
3.5-Inch Diskette Drive
Figure 14. 3.5-Inch Diskette Drive Removal
1Drive release tab

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To remove the 3.5-inch diskette drive from the drive shelf, perform the following steps.
NOTE: This procedure assumes that you have removed the drive shelf from the chassis.
1. Press down on the drive release tab on the top left side of the 3.5-inch diskette drive (see Figure 14).
The 3.5-inch diskette drive will pop up slightly when the tab disengages.
2. Pivot the 3.5-inch diskette drive up and out of the drive shelf.
To replace the 3.5-inch diskette drive, perform the following steps:
1. Rotate the replacement drive into position under the right diskette drive bracket on the drive shelf.
2. Lower the left side of the diskette drive while gently pressing downward, so that the slots on the bottom
of the 3.5-inch diskette drive engage in hooks on the drive shelf.
3. Ensure that the drive release tab on the left side of the 3.5-inch diskette drive engages the top of the
diskette drive.
If necessary, press on the tab from the bottom of the drive shelf.
4. Replace the drive shelf and connect the interface and power cable connectors.
CD-ROM Drive
Figure 15. CD-ROM Drive Removal
1Drive release tab
To remove a CD-ROM drive, perform the following steps.
NOTE: This procedure assumes that you have removed the drive shelf from the chassis.
1. Push down on the drive release tab on the right side of the drive (see Figure 15).

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2. Slide the CD-ROM drive assembly forward and up and out of the chassis.
To replace a CD-ROM drive, perform the following steps:
1. Align the tabs on the bottom of the CD-ROM drive with the notches on the drive shelf, and slide the
drive toward the back of the shelf until it snaps into place (see Figure 16).
Figure 16. CD-ROM Drive Replacement
1Tabs (2)
2Notches (2)
2. Connect a power cable and an interface cable to the appropriate connectors on the back of the drive
(see Figure 17).
Figure 17. CD-ROM Drive Cable Attachment
1Interface cable
2Power cable
3Power input connector
4Interface connector
Check all cable connections. Fold cables out of the way to provide airflow for the fan and cooling
vents.
3. Replace the computer cover; reconnect your computer and peripherals to their electrical outlets, and
turn them on.

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4. Update your system configuration information.
Set the Drive 1 option under Drives: Primary to Auto. See the online System User's Guide for
more information.
5. Verify that your system works correctly by running the Dell Diagnostics (see the online System User's
Guide for complete information).
System Power Supply
Figure 18. Power Supply Removal
1Securing screw
hole
2AC power
receptacle
3Power supply
4System board
DC power
connectors (2)
5Drive DC power
connectors (3)
To remove the system power supply, perform the following steps:
1. Disconnect the AC power cable from the back of the power supply.
2. Disconnect the DC power cables from the system board and the drives.
3. Remove the screw on the side of the chassis that secures the power supply.
4. Remove the screw below the AC power receptacle at the back of the chassis.
5. Slide the power supply toward the center of the computer approximately 1 inch.
6. Lift the power supply up and out the computer chassis.
Expansion-Card Cage

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Figure 19. Expansion-Card Cage Removal
1Securing lever
2Expansion-card
cage
3Tabs (2)
4Hooks (2)
To remove the expansion-card cage from the chassis, perform the following steps:
1. Remove the computer cover.
NOTICE: Use a wrist grounding strap as explained in "Precautionary Measures."
2. Examine the cables connected to expansion cards through the back-panel openings, and disconnect
any cables that will not reach to where the cage must be placed when it is removed from the chassis.
3. Locate the securing lever and rotate the lever upward until it stops in an upright position.
4. Lift the expansion-card cage up and out of the chassis.
To replace the expansion-card cage into the chassis, perform the following steps:
1. With the securing lever in the upright position, align the tabs in the side of the expansion-card cage
with the mating hooks on the left side of the chassis wall (see Figure 19). Slide the expansion-card
cage into place.
2. Rotate the securing lever downward until it is flush with the top side of the chassis. Make sure that the
riser board is fully seated in the RISER connector on the system board.
3. Reconnect any cables you removed in step 2 of the previous procedure.
Riser Board
Figure 20. PCI Riser Board
1Auxiliary power indicator LED
(AUX_LED)
2Wakeup On LAN jumper (WOL)
3
PCI expansion slot 1 (PCI1)

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4PCI expansion slot 2 (PCI2)
The chassis has a PCI riser board that has two PCI expansion-card connectors (see Figure 20).
To remove the PCI riser board, perform the following steps:
1. Remove the expansion-card cage.
2. Remove the expansion cards installed in the slots.
3. Remove the screws securing the riser board to the expansion-card cage.
4. Lift the riser board off the expansion card cage.
System Board Components
The subsections that follow contain procedures for removing system board components, which are shown in
Figure 21.
Figure 21. System Board Components

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1DIMM sockets (3)
23.3-V power connector
3Battery socket
4Chassis intrusion switch connector
5Control panel connector
6Main power input connector
7Video-memory upgrade socket
8Primary EIDE interface connector
9Secondary EIDE interface connector
10 Diskette/tape drive interface connector
11 System board jumpers
12 Riser board connector
13 ATI multimedia connector
14 Audio line-in connector
15 Audio line-out connector
16 Microphone jack
17 Optional integrated NIC connector
18 Telephony connector
19 Video connector

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20 CD-in connector
21 Microprocessor fan connector
22 Serial port 2 connector
23 USB connectors (2)
24 Mouse/keyboard connector (stacked)
25 Parallel/serial port 1 connector (stacked)
System Board Jumpers
Figure 22 shows the layout of jumpers on the system board.
Figure 22. System Board Jumpers
Table 1 lists the system-board jumper settings, and it gives a brief description of their functions.
Table 1. System-Board Jumper Settings
Jumper Setting Description
PSWD (default) Password features are enabled.
Password features are disabled.
BIOS (default) Reserved (do not change)
BUS66M (default) Reserved (do not change)
266MHZ* (default) Reserved (do not change)
300MHZ* (default) Reserved (do not change)
333MHZ* (default) Reserved (do not change)
350MHZ* (default) Reserved (do not change)
400MHZ* (default) Reserved (do not change)
450MHZ* (default) Reserved (do not change)
500MHZ* (default) Reserved (do not change)
* The correct microprocessor speed is automatically detected and set by the system.
Do not change the settings of these jumpers.