Dell OptiPlex GX100 User manual

Dell™OptiPlex™GX100SystemsServiceManual
Small-Form-Factor Chassis —Removing and Replacing Parts
Low-Profile Chassis —Removing and Replacing Parts
Mini Tower Chassis —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.
©1999-2000 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 and OptiPlex are trademarks of Dell Computer 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: May 1999
Last revised: 24 Aug 2000

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Low-Profile Chassis —RemovingandReplacingParts:Dell™OptiPlex™GX100
Systems Service Manual
Overview
This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell OptiPlex low-profile
chassis GX100 system.
Unless otherwise noted, each procedure assumes that the following conditions exist:
lYou have performed the steps in "Precautionary Measures."
lYou have removed the computer cover.
lYou 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 file require the use of one or more of the following tools:
lSmall flat-blade screwdriver
lWide flat-blade screwdriver
l#1 and #2 Phillips-head screwdrivers
l1/4-inch nut driver
Also, use a wrist grounding strap as explained in "Precautionary Measures."
Precautionary Measures
Before you perform any procedure in this section, take a few moments to read the following caution for your personal safety and to prevent
damage to the system from ESD.
Overview
Recommended Tools
Precautionary Measures
Internal Views
Computer Cover
Eject, Power, and Reset Buttons
Front-Panel Inserts
Control Panel
Chassis Intrusion Switch
Drives
System Power Supply
Riser Boards
System Board Components
Expansion-Card Cage
Expansion Cards
DIMMs
Microprocessor/Heat Sink Assembly
System Battery
System Board
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.

Internal Views
Figure 1 shows a top view of the low-profile chassis to help you orient yourself when you work inside the computer.
Figure 1. Low-Profile Chassis Orientation View
Figure 2 shows the low-profile chassis with the cover removed.
Figure 2. Inside the Low-Profile Chassis
Computer Cover
Figure 3. Computer Cover Removal
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 system board is not on. If it is on, you may need to wait 10 to 30 seconds for it to go out
(see Item 13 on Figure 17).
1
System board
2
Hard-disk drive
3
Power supply
4
Externally accessible drive bays
1
Diskette drive in upper bay
2
Diskette drive interface cable
3
Hard-disk drive interface cable
4
Hard-disk drive
5
Chassis intrusion switch
6
Expansion-card cage
7
Expansion-card slots
8
Security cable slot
9
I/O ports and connectors
10
AC power receptacle
11
Padlock ring
12
Power supply

To remove the low-profile chassis computer cover, perform the following steps:
1. Press in on the two securing buttons until the cover is free to swing up (see Figure 3).
2. Raisethebackofthecover,andpivotittowardthefrontofthecomputer.
3. Lift the cover off the hooks at the front of the chassis.
4. Disengage the tabs that secure the cover to the top of the chassis, and lift the cover away.
Figure 4. Computer Cover Replacement
To replace the low-profile chassis 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, Power, and Reset Buttons
Figure 5. Eject, Power, and Reset Button Removal

To remove the eject, power, and reset buttons, perform the following steps:
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 or the reset button, use a small screwdriver and push in the two or three plastic clips that hold the button to the
bezel.Whentheseclipsarereleased,thebuttonscomefreefromthebezel.
Front-Panel Inserts
Figure6.5.25-Inch Front-Panel Insert Removal
To remove a 5.25-inch front-panel insert, perform the following steps:
1. Hold the bezel with the front facing you.
2. From the front of the top cover, use your thumbs to press inward on the insert until it snaps free of the cover.
To replace a 5.25-inch front-panel insert, position the two ring-tabs over the posts on the inside of the bay opening, and then press the ring tabs
over the posts.
Control Panel
Figure 7. Control Panel Removal
To remove the control panel in the low-profile chassis, perform the following steps:
1
Disk eject button
2
Reset button
3
Power button
1
Posts (2)
2
Front of top cover
3
Ring tabs (2)
1
Control panel
2
Chassis intrusion switch

1. Disconnect the control panel cable from the PANEL connector on the system board (see "System Board Labels" for the location of the
PANEL connector).
2. From inside the chassis, remove the mounting screw that secures the control panel to the chassis.
3. Disconnect the chassis intrusion switch cable connector from the control panel.
4. Remove the control panel from the chassis.
When you reinstall the control panel, be sure to put the right side of the control panel behind the mounting tab.
Chassis Intrusion Switch
Figure 8. Chassis Intrusion Switch Removal
To remove the chassis intrusion switch in the low-profile chassis, perform the following steps:
1. Disconnect the chassis intrusion switch cable connector from the control panel on the front of the chassis and shown in Figure 8.
Note the routing of the chassis intrusion cable as you remove it from the chassis. Hooks on the chassis keep the cable in place.
2. Slide the chassis intrusion switch out of its slot to remove it from the chassis (see Figure 8).
3. Install the replacement chassis intrusion switch and cable.
4. To reset the chassis intrusion detector, enter System Setup and reset Chassis Intrusion to Enabled or Enabled-Silent (see your User's
Guide for instructions).
Drives
Figure 9. Drive Locations

1
Control panel
2
Chassis intrusion switch
NOTE: In all of the following procedures, left and right refer to your left and right as you face the front of the computer.

3.5-Inch Diskette Drive
To remove the 3.5-inch diskette drive assembly from the drive shelf, perform the following steps:
1. Disconnect the DC power cable and the interface cable from the back of the drive.
2. Press both release latches on the left side of the 3.5-inch diskette drive.
3. Pivot the 3.5-inch diskette drive upward 1 inch (2.5 cm), and then pull the drive away from the notched tabs on the right chassis wall.
4. Remove the bracket from the diskette drive you just removed.
5.25-inch Drive
To remove the 5.25-inch drive/bracket assembly, perform the following steps:
1. Remove the diskette drive and bracket.
2. Disconnect the DC power cable and EIDE cable from the drive.
3. Lift the 5.25-inch drive/bracket straight up and out of the chassis.
Hard-Disk Drive Removal
Figure 10. Hard-Disk Drive/Bracket Assembly Removal
To remove the hard-disk drive/bracket assembly, perform the following steps:
1. Disconnect the DC power cable and EIDE cable from the drive.
2. Loosen the captive screw securing the hard-disk drive/bracket to the bottom of the chassis.
3. Grasp the drive/bracket, and pivot it upward from the chassis until the two hinge tabs (located on the side opposite the screw) clear the floor
divider (see Figure 10). Then lift the bracket upward and out of the chassis.
4. To remove the hard-disk drive from the bracket, place the drive/bracket on a flat surface with the bracket facing up.
5. Remove the four screws that secure the bracket to the drive.
Figure 11. Hard-Disk Drive to Bracket Installation
1
5.25-inchdrive
2
3.5-inch diskette drive
3
Hard-disk drive
4
Chassis intrusion switch
NOTE: Computer configurations differ. Your computer may have an Iomega Zip drive installed instead of a 3.5-inch diskette drive, or
your computer may have no externally accessible drives installed.
1
Captive screw
2
Hinge tabs on back of drive bracket (2)
3
Slots in floor divider (3)

To install a replacement hard-diskdrive,performthefollowingsteps.
NOTICE: To avoid 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.
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. To install the hard-disk drive to the bracket, place the drive top-down on a flat surface with the bracket mounting holes facing up.
4. Position the bracket over the holes and install four screws to secure the bracket to the drive.
5. Insert the bracket's hinge tabs into the chassis slots so that the tabs hook over the slots.
6. Rotate the bracket toward the chassis floor and secure the bracket with a screw.
7. Connect a power cable to the power input connector on the back of the drive (see Figure 12).
8. Check all connectors to ensure that they are properly cabled and firmly seated.
9. Connect one of the device connectors on the EIDE cable to the 40-pin interface connector on the back of the hard-disk drive.
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.
Figure 12. Hard-Disk Drive Cable Attachment
NOTICE: You must attach 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 interface cable with pin 1 on the IDE1 connector to avoid possible
damage to your system.
1
Hard-disk drive
2
Bracket
3
Screws (4)
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."
1
Power cable
2
EIDE interface cable
3
IDE1 connector on system board

10. If it is not already connected, connect the blue connector on the EIDE interface cable to the IDE1 connector on the system board.
To locate the IDE1 connector on the system board, see "System Board Components."
11. Replace the computer cover. Then reconnect your computer and peripherals to their electrical outlets, and turn them on.
12. If the drive you just installed is the primary drive, insert a bootable diskette into drive A.
13. Turn on the computer system.
14. Enter System Setup and update the appropriate Primary Drive option, 0 or 1 (see the online System User's Guide for complete information).
15. After you update the System Setup settings, reboot the system.
16. Partition and logically format your drive before you proceed to the next step.
See the documentation for your operating system for instructions.
17. Test the hard-disk drive by running the Dell Diagnostics (see the online System User's Guide for complete information.
18. 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.
System Power Supply
Figure 13. Power Supply Removal
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.
Note the routing of the DC power cables underneath the tabs in the chassis as you remove them from the system board and drives. It is
important to route these cables properly when you replace them to prevent them from being pinched or crimped.
3. Removethescrewbelowthefanguardonthebackofthechassis.
4. Slide the power supply toward the front of the computer approximately 1 inch.
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.
1
AC power cord
2
AC power receptacle
3
Power supply
4
DC power cables
5
Securing screw

5. Liftthepowersupplyupandoutofthechassis.
Expansion-Card Cage
Figure 14. Expansion-Card Cage Removal
To remove the expansion-card cage, perform the following steps:
1. Examine any 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 upon removal from the chassis.
2. Locatethesecuringlever(seeFigure14).Rotatetheleverupwarduntilitstopsinanupright position.
3. Slide the expansion-card cage out of the chassis.
4. Lift the expansion-card cage up and away from the chassis.
To replace the expansion-card cage into the low-profile chassis, perform the following steps:
1. With the securing lever in the upright position, align the expansion-card cage slots with the tabs in the chassis opening for the expansion-
card cage (see Figure 14). Slide the expansion-card cage into place.
2. Rotate the securing lever downward until it is flush with the top 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 1 of the previous procedure.
Riser Boards
The low-profile chassis is available with either a PCI riser board (see Figure 15) or a PCI/ISA riser board (see Figure 16). The PCI riser board
provides three PCI expansion card slots. The PCI/ISA riser board provides one PCI expansion slot, one ISA expansion slot, and one shared
PCI/ISA expansion slot.
Figure 15. PCI Riser Board
Figure 16. Low-Profile Chassis PCI/ISA Riser Board
1
Securing lever
2
Expansion-card cage
3
Slots (2)
4
Tabs (2)
NOTICE: Use a wrist grounding strap as explained in "Precautionary Measures."
1
Auxiliary power indicator
LED (AUX_LED)
2
Wakeup On LAN (WOL)
connector
3
PCI expansion slot 1 (PCI1)
4
PCI expansion slot 2 (PCI2)
5
PCI expansion slot 3 (PCI3)

To remove the 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 17.
Figure 17. System Board Components
System Board Jumpers
Figure 18 shows the layout of jumpers on the system board.
Figure 18. Layout of System Board Jumpers
1
Standby power indicator (AUX_LED)
2
ISA expansion slot 1 (ISA1; shared with
PCI2)
3
ISA expansion slot 2 (ISA2)
4
Remote Wakeup header (WOL)
5
PCI expansion slot 1 (PCI1)
6
PCI expansion slot 2 (PCI2; shared with
ISA1)
CAUTION: Ground yourself by touching an unpainted metal surface on the back of the computer.
NOTICE: Use a wrist grounding strap as explained in "Precautionary Measures."
1
NIC connector
2
Video connector
3
Fan power connector
4
Serial port 2 connector
5
USB connectors (2)
6
Mouse (upper) and keyboard (lower) connectors
7
Parallel port (upper) and serial port 1 (lower)
connectors
8
System board jumpers
9
Riser board connector
10
EIDE1 connector
11
EIDE2 connector
12
Diskette/tape-drive connector
13
Auxiliary power indicator
14
DIMM connectors (2)
15
3.3 VDC power connector
16
Control panel connector
17
DC power connector

Jumper pins are small groups of two or more pins on a circuit board. Plastic jumpers containing a wire fit down over the pins. The wire connects
the pins and creates a circuit.
NOTICE: Make sure your system is turned off before you change a jumper setting. Otherwise, damage to your system or
unpredictable results may occur.
To change a jumper setting, pull the jumper off its pin(s) and either remove it entirely, or carefully fit it down onto the pin(s) indicated.
Dell shipped your computer with a PSWD jumper installed, meaning that password features for this computer are enabled. When you remove the
jumper, or when you install the jumper on only one of the two pins, the password features are disabled.
System Board Labels
Table 1 lists the labels for connectors and sockets on your system board, and it gives a brief description of their functions.
Table 1. System Board Connectors and Sockets
Expansion Cards
The low-profile GX100 chassis can accommodate three 32-bit PCI expansion cards. Figure 19 shows an example of a 32-bit PCI expansion card.
Figure 19. 32-Bit PCI Expansion Card Example
Connector or Socket
Description
AUX_LED
Auxiliary power indicator
B1
Battery socket
DIMM_x
DIMM socket
DSKT
Diskette/tape drive interface connector
ENET
Integrated NIC connector
FAN
Microprocessor fan connector
IDEn
EIDE interface connector
KYBD
Keyboard connector
MICROPROCESSOR
Microprocessor connector
MONITOR
Video connector
MOUSE
Mouse connector
PANEL
Control panel connector
PARALLEL
Parallel port connector; sometimes referred to as LPT1
POWER_1
Main power input connector
POWER_2
3.3-V power input connector
RISER
Riser board connector
SERIALn
Serial port connectors
USB
USB connectors

Expansion-Card Removal
To remove an expansion card, perform the following steps:
1. Remove the computer cover.
2. If necessary, disconnect any cables connected to the card.
3. Remove the screw on the mounting bracket of the card you want to remove.
4. Grasp the card by its outside corners, and ease it out of its connector.
5. If you are removing the card permanently, install a metal filler bracket over the empty card-slot opening.
6. Replace the computer cover, and reconnect your computer and peripherals to their power sources and turn them on.
7. To reset the chassis intrusion detector, enter System Setup and reset Chassis Intrusion to Enabled or Enabled-Silent.
See the online System User's Guide for detailed information on the Intrusion detector.
Expansion-Card Installation
Figure 20. Expansion-Card Installation
To install an expansion card, perform the following steps:
1. Prepare the expansion card for installation, and remove the computer cover.
CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."
NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain Federal Communications Commission
(FCC) certification of the system. The brackets also keep dust and dirt out of your computer.
NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be displayed at the
next system start-up:
ALERT! Cover was previously removed.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the
chassis intrusion detector.
1
Expansion card
2
Card-edge connector
3
Riser board
4
Expansion-card connector
5
Expansion-card cage
CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."
CAUTION: Some network cards automatically start the system when they are connected. To guard
against electrical shock, be sure to unplug your computer from its electrical outlet before installing
any expansion cards

See the documentation that came with the expansion card for information on configuring the card, making internal connections, or otherwise
customizing it for your system.
2. Remove the screw and remove the metal filler bracket that covers the card-slot opening for the expansion-card slot you intend to use (see
Figure 21).
Save the screw to use when installing the expansion card later in this procedure.
Figure 21. Filler Bracket Removal
3. Insert the expansion card into the expansion-card connector.
If the expansion card is full-length, insert the front end of the card into the corresponding card guide on the inside front of the chassis as you
insert the card into its connector. Insert the card's edge connector firmly into the expansion-card slot.
4. When the card is firmly seated in the connector, secure the card's mounting bracket to the chassis with the screw you removed in step 2.
5. Connect any cables that should be attached to the card.
See the documentation for the card for information about the card's cable connections.
6. Replace the computer cover, and reconnect your computer and peripherals to their power sources and turn them on.
7. To reset the chassis intrusion detector, enter System Setup and reset Chassis Intrusion to Enabled or Enabled-Silent.
See the User's Guide for detailed information on the chassis intrusion detector.
DIMMs
Figure 22. DIMM Removal
To remove a DIMM, perform the following steps:
1. Push outward on the two DIMM socket ejectors simultaneously until the DIMM is released from its socket.
2. Lift the DIMM away from the socket.
To install a DIMM, press the DIMM fully into the socket while closing the ejectors to lock the DIMM into the socket (see Figure 23).
Figure 23. DIMM Installation
1
Filler bracket
NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be
displayed at the next system start-up:
ALERT! Cover was previously removed.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the
chassis intrusion detector.
1
Ejectors (2)
CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

Microprocessor/Heat Sink Assembly
Figure 24. Microprocessor/Heat Sink Removal
To replace a microprocessor, perform the following steps:
1. Remove the computer cover.
2. Locate the microprocessor socket on the system board.
3. Unplug the fan power connector on the system board.
4. Remove the screws securing the fan to the top of the heat sink assembly. Then remove the fan.
5. Remove the metal clip that secures the heat sink to the microprocessor socket. Then remove the heat sink from the microprocessor chip.
6. Press down on the folded part of the clip with a small screwdriver to release the clip (see Figure 24). The securing clip hooks over tabs on
the sides of the socket.
7. Remove the microprocessor chip from the socket.
Your microprocessor socket is a zero insertion force (ZIF) socket with a lever-type handle that secures the chip in, or releases it from, the
socket.
To remove the chip, pull the microprocessor-socket release lever straight out until the chip is released (see Figure 25). Then remove the chip
from the socket. Leave the release lever extended so that the socket is ready for the new microprocessor.
Figure 25. Microprocessor Chip Removal
1
Ejectors (2)
2
Notches (2)
1
Securing clip
2
Press here to release securing clip
CAUTION: The microprocessor SEC cartridge/heat sink assembly can get extremely hot. Be sure that the assembly has had
sufficient time to cool before you touch it.
CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."
NOTE:Dell recommends that only a technically knowledgeable person perform this procedure.
NOTICE: Be careful not to bend any of the pins when removing the microprocessor chip from its socket. Bending the pins can
permanently damage the microprocessor chip.

8. Unpack the new microprocessor.
If any of the pins on the chip appear to be bent, see the online System User's Guide for information on obtaining technical assistance.
9. Align the pin-1 corner of the microprocessor chip with the pin-1 corner of the microprocessor socket (see Figure 26).
The pin-1 corner of the microprocessor is the squared off corner (see Figure 26).
10. Install the microprocessor chip in the socket (see Figure 26).
If the release lever on the microprocessor socket is not all the way out, move it to that position now.
With the pin-1 corners of the chip and socket aligned, align the pins on the chip with the holes in the socket. Set the chip lightly in the socket
and make sure that all pins are headed into the correct holes. Because your system uses a ZIF microprocessor socket, there is no need to
use force (which could bend the pins if the chip is misaligned). When the chip is positioned correctly, it should seat itself in the socket with
minimal pressure.
When the chip is fully seated in the socket, pivot the microprocessor-socket release lever back toward the socket until it snaps into place,
securing the chip.
Figure 26. Microprocessor Chip Installation
11. Unpack the heat sink included in your upgrade kit.
Peel the release liner from the adhesive tape that is attached to the bottom of the heat sink.
12. Place the heat sink on top of the microprocessor chip (see Figure 27).
Figure 27. Heat Sink Installation
1
Microprocessor chip
2
Release lever
3
Microprocessor socket
CAUTION: Ground yourself by touching an unpainted metal surface on the back of the computer.
NOTICE: Be careful not to bend any of the pins when unpacking the microprocessor. Bending the pins can permanently damage
the microprocessor.
NOTE: Identifying the pin-1 corners is critical to positioning the chip correctly.
NOTICE: When placing the microprocessor chip in the socket, be sure that all of the pins go into the corresponding holes on
all sides of the socket. Be careful not to bend the pins.
NOTICE: Positioning the microprocessor chip incorrectly in the socket can permanently damage the chip and the computer
when you turn on the system.
1
Pin-1 corners of chip and socket aligned
CAUTION: Ground yourself by touching an unpainted metal surface on the back of the computer.

13. Replace the heat sink securing clip.
Orient the clip as shown in Figure 27, and hook the unfolded end of the clip over the tab on the top edge of the socket. Then press down on
the folded end of the clip to snap the clip over the tab on the bottom edge of the socket.
14. Replace the fan assembly and secure it with two thumbscrews. Then connect the fan power cable to the FAN connector on the system
board .
15. Replace the computer cover, and then reconnect your computer and peripherals to their power sources and turn them on.
As the system boots, it detects the presence of the new microprocessor and automatically changes the system configuration information in
System Setup.
16. Enter System Setup and confirm that the Microprocessor category correctly identifies the installed microprocessor.
17. Run the Dell Diagnostics to verify that the new microprocessor is operating correctly.
System Battery
Figure 28. System Battery Removal

To remove the system battery, perform the following steps:
1. If possible, enter System Setup and print the System Setup screens.
2. Remove the system battery by carefully prying it out of its socket with your fingers or with a blunt, nonconducting object such as a plastic
screwdriver.
When you replace the system battery, orient the new battery with the "+" facing up. Insert the battery into its socket and snap it into place.
1
Fan screws (2)
2
Fan
3
Securing clip
4
Heat sink
5
Celeron™
microprocessor
6
Microprocessor ZIF
socket
1
Battery
2
Socket
CAUTION: There is a danger of the new battery exploding if it is incorrectly installed. Replace the battery only with the same or
equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer’s instructions.

System Board
Figure 29. System Board Removal
To remove the system board, perform the following steps:
1. Disconnect all cables from their connectors at the back of the computer.
2. Remove the expansion-card cage.
3. Disconnect all cables from the system board.
4. Remove the screw that secures the system board to the bottom of the chassis.
5. Slide the system board toward the front of the chassis until it stops.
6. Carefully lift the system board out of the chassis (be sure to lift evenly and not twist the system board).
To replace the system board, perform the following steps:
1. Remove the DIMMs and the microprocessor/heat sink assembly, and install them on the replacement board.
2. Set the jumpers on the new system board so that they are identical to those on the old board, unless you are installing a microprocessor
upgrade.
3. Push down near each slot to engage the grounding clip onto its corresponding tab.
4. Push evenly on both sides of the system board as you slide and lock it into position (do not twist the system board).
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Back to Contents Page
Mini Tower Chassis —RemovingandReplacingParts:Dell™OptiPlex™GX100
Systems Service Manual
Overview
This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell OptiPlex mini tower
chassis GX100 system.
Unless otherwise noted, each procedure assumes that the following conditions exist:
lYou have performed the steps in "Precautionary Measures."
lYou have removed the computer cover.
lYou 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 file require the use of one or more of the following tools:
lSmall flat-blade screwdriver
lWide flat-blade screwdriver
l#1 and #2 Phillips-head screwdrivers
l1/4-inch nut driver
Also, use a wrist grounding strap as explained in "Precautionary Measures."
Precautionary Measures
Before you perform any of the procedures in this file, take a few moments to read the following caution for your personal safety and to prevent
damage to the system from ESD.
Overview
Recommended Tools
Precautionary Measures
Internal Views
Computer Cover
Front Bezel
Eject, Power, and Reset Buttons
Front-Panel Inserts
Control Panel
Chassis Intrusion Switch
Drives
System Power Supply
Riser Boards
System Board Components
Expansion-Card Cage
Expansion Cards
DIMMs
Microprocessor/Heat Sink Assembly
System Battery
System Board
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.

Internal Views
Figure 1 shows a side view of the mini tower chassis computer to help orient you when you work inside the computer.
Figure 1. Mini Tower Chassis Orientation View
Figure 2 shows the mini tower chassis with the cover removed.
Figure 2. Inside the Mini Tower Chassis
Computer Cover
Figure 3. Computer Cover Removal
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 system board is not on. If it is on, you may need to wait 10 to 30 seconds for it to go out
(see Item 13 of Figure 24).
1
System board
2
Power supply
3
5.25-inch drive slots
4
Internal hard-disk drive bracket
5
Expansion-card cage
6
Bottom of computer
1
5.25-inch drive slots
2
hard-disk drive bracket
3
Chassis intrusion switch
4
Hard-disk drive interface
cable
5
Expansion-card cage
6
System board
7
Riserboard
8
Padlock ring
9
I/O ports and connectors
10
Security cable slot
11
AC power receptacle
12
Power supply