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Midsize Chassis — Removing and Replacing Parts: Dell™ OptiPlex™ GX110 Systems Service Manual

	Overview		Drives
	Recommended Tools		System Power Supply
	Precautionary Measures		System Board Components
	Restarting the System		Expansion Cards
	Computer Cover		Riser Boards
	Internal View		DIMMs
	Front-Panel Inserts		Microprocessor/Heat Sink Assembly
	Expansion Card Cage		System Battery
	Control Panel		System Board

Overview

This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell OptiPlex GX110 midsize chassis 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

The procedures in this file require the use of a #2 Phillips-head screwdriver.

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.

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: Turn off the computer and all peripherals. Disconnect the computer and peripherals from their electrical outlets. Also, disconnect any telephone or telecommunication lines from the computer. Doing so reduces the potential for personal injury or shock. 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 the electrical outlet before disconnecting the peripheral or removing the component to avoid possible damage to the system board. 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. Verify that the standby power LED 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 Figures 19 and 20 or the internal service label).

Restarting the System

To restart the system and reset the chassis intrusion detector, perform the following steps:

1. Replace the computer cover and reconnect the computer and peripherals to their electrical outlets and turn them on.
   
   

NOTE: When you start the system, the chassis intrusion detector will cause the following message to be displayed at the next system start-up: ALERT! Cover was previously removed.

2. To reset the chassis intrusion detector, enter System Setup and reset Chassis Intrusion to Enabled or Enabled-Silent.
   
   

NOTE: If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion detector.

Computer Cover

Figure 1. Computer Cover Removal

1 Securing buttons (2) 2 Cover hooks (4)

To remove the computer cover, perform the following steps:

1. Turn off your computer and peripherals, and observe the caution for your personal safety and protection of the equipment described in "Precautionary Measures."
   
   
2. If you have installed a padlock through the padlock ring on the back panel, remove the padlock.
   
   
3. Press in on the two securing buttons until the cover is free to swing up (see Figure 1).
   
   
4. Raise the back of the cover, and pivot it toward the front of the computer.
   
   
5. Lift the cover off the hooks at the front of the chassis.
   

Figure 2. Computer Cover Replacement

1 Securing buttons (2) 2 Cover hooks (4)

To replace the computer cover, perform the following steps:

1. Check all cable connections, especially those that might have come loose during your work. Fold cables out of the way so that they do not catch on the computer cover. Make sure cables are not routed over the drive cage—they will prevent the cover from closing properly.
   
   
2. Facing the left side of the computer, hold the cover at a slight angle as shown in Figure 2.
   
   
3. Fit the cover hooks into the rectangular slots on the chassis. (It might be helpful to look down into the chassis to verify that the hooks are in place.)
   
   
4. Pivot the cover down toward the back and into position. Make sure that the two securing buttons click into place.
   

Internal View

Figure 3 shows the chassis with the cover removed.

Figure 3. Inside the Chassis

1 Drive in upper bay 2 Internal drive cage 3 Chassis intrusion switch 4 Drive interface cable 5 Expansion-card cage 6 Security cable slot 7 I/O ports and connectors 8 AC power receptacle 9 Padlock ring 10 Power supply 11 System board 12 Drive interface cable

Front-Panel Inserts

Figure 4.  5.25-Inch Front-Panel Insert Removal

1 5.25-inch front-panel insert 2 Ring tabs (2) 3 Posts (2)

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.

Expansion-Card Cage

Figure 5. Expansion-Card Cage Removal

1 Slots (2) 2 Tabs (2) 3 Securing lever

To remove the card cage, complete the following steps:

1. Rotate the lever toward the back of the computer until it stops in the upright position.
   
   
2. Lift the expansion-card cage up and away from the computer.
   
   

To replace an expansion-card cage, keep the cage flush against the chassis to ensure that the lever engages the notch when the lever is depressed.

Control Panel

Figure 6. Control Panel Removal

1 Chassis hooks (2) 2 Mounting screw 3 Control panel 4 Control panel cable

To remove the control panel, perform the following steps:

1. Remove the hard-disk drive cage.
   
   
2. Disconnect the control panel cable from the PANEL connector on the system board (see Figure 14 or the internal service label for the location of the PANEL connector).
   
   
3. Remove the mounting screw holding the control panel to the chassis.
   
   
4. Slide the control panel out of the hooks holding it to the chassis.
   
   Note the routing of the control panel cable as you remove it from the chassis.
   
   

To reinstall the control panel, perform the removal procedure in reverse.

Drives

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 Removal

To remove the 3.5-inch diskette drive assembly, perform the following steps:

1. Remove the computer cover.
   
   
2. Disconnect the DC power and cables from the diskette drive.
   
   
3. Rotate the left side of the 3.5-inch diskette drive assembly up, and lift the assembly out of the chassis (see Figure 7).
   
   
4. Remove the two drive-mounting screws from the left side of the drive, and remove the drive from the bracket.

When you replace the 3.5-inch diskette drive, be sure that the two hooks on the right side of the bracket engage the mounting holes in the side of the 3.5-inch diskette drive.

Figure 7. 3.5-Inch Diskette Drive Removal

1 Bracket-mounting screw 2 Hooks (2) 3 Drive-mounting screws (2)

5.25-Inch Drive Removal

To remove a device from an externally accessible drive bay, perform the following steps:

1. Remove the computer cover.
   
   
2. Disconnect the DC power and data cables from the back of the drive.
   
   
3. Squeeze the retaining tabs that extend from each side of the drive bracket and slide the bracket out of the bay (see Figure 8).  
   
   
4. Turn the drive assembly upside down and unscrew the four screws that secure the drive to the bracket (see Figure 9).
   

NOTE: For easier access inside the chassis, you may want to rotate the power supply out of the way temporarily.

To install a 5.25-inch drive, perform the 5.25-inch drive removal procedure in reverse.

Figure 8. 5.25-Inch Drive Removal

Figure 9. Drive Bracket

Hard-Disk Drive Removal

If a hard-disk drive is already installed on the drive bracket, disconnect the DC power cable and EIDE cable from the drive.

Figure 10. Removing the Hard-Disk Drive Bracket

1 "Handle" on bracket 2 Screw securing drive to chassis

Figure 11. Inserting the Hard-Disk Drive in the Bracket

1 Drive bracket 2 Tabs (2) 3 1.6-inch drive 4 Screws (4)

If you are replacing a drive in the 1.6-inch slot, use the four screw holes in the side of the bracket. If you are replacing a drive in the 1-inch slot, use the four screw holes in the bottom of the bracket.

Hard-Disk Drive Replacement

Hold the bracket by its handle, so that it stays at the proper tilt. Let it brush the side of the drive cage as you lower it into the chassis until the two tabs at the bottom back of the bracket (see Figure 11) fit flush against the front of the rail that extends across the chassis floor and the horizontal lip at the back fits over the rail (see Figure 12).

Rotate the bracket down into position, and reinstall the screw you removed in step 3.

NOTICE: You must match the colored strip on the EIDE cable with pin 1 on the IDE1 connector to avoid possible damage to your system.

2. Connect one of the device connectors on the EIDE cable to the 40-pin interface connector on the back of the hard-disk drive (see Figure 12). The cable is keyed so that the colored edge of the EIDE cable lines up with the pin-1 end of the interface connector.

NOTE: Ultra Advanced Technology Attachment (ATA)/66 hard-disk drives require an 80-conductor cable to transfer data at full speed. The 80-conductor cable has a 40-pin connector just like the Ultra ATA/33 cable but has twice as many wires within the cable itself. If you use an Ultra ATA/33 cable with Ultra ATA/66 hard-disk drives, they will transfer data at Ultra ATA/33 speeds.

Figure 12. Attaching Hard-Disk Drives Cables

1 Interface connector 2 Power input connector on drive 3 Lip 4 Rail 5 IDE1 connector 6 IDE2 connector 7 DC power cable 8 EIDE cable

NOTICE: You must match the colored strip on the EIDE cable with pin 1 on the IDE1 connector to avoid possible damage to your system. Pin 1 is indicated by a silk-screened "1" printed on the system board.

3. If it is not already connected, connect the other end of the EIDE cable to the appropriate EIDE interface connector on the system board.

To locate the IDE1 connector on the system board, see Figures 19 and 20.

4. Connect a DC power cable into the power input connector on the back of the drive (see Figure 12).

Check all connectors to be certain that they are properly cabled and firmly seated.

5. Replace the computer cover. Then reconnect your computer and peripherals to their electrical outlets, and turn on the peripherals.
   
   
6. Insert a bootable diskette (such as the Dell Diagnostics Diskette) into drive A, and turn on the computer system.
   
   
7. Enter System Setup and update the Drive 0 option under Primary Drive n.

   After you update the drive setting, reboot the system.

8. Partition and logically format your drive before proceeding to the next step.

   See the documentation for your operating system for instructions.

9. Test the hard-disk drive by running the Hard-Disk Drive(s) Test Group in the Dell Diagnostics.
   
   
10. Install your operating system on your hard-disk drive.

Refer to the documentation that came with your operating system.

System Power Supply

System Power Supply Rotation

To access some components on the system board, you may have to rotate the system power supply out of the way. To rotate the power supply, perform the following steps:

1. Remove the computer cover.

2. Disconnect the AC power cable from the AC power receptacle on the back of the power supply (see Figure 13).

Figure 13. System Power Supply Rotation

1 Securing tab 2 Power supply 3 Release latch

System Power Supply Removal

To remove the system power supply, perform the following steps:

1. Rotate the system power supply.
   
   
2. Disconnect the power cables from all drives.
   
   
3. Remove the power supply cables from the system board.
   
   
4. Lift the front of the power supply until it stops. Then rotate the power supply away from the chassis.
   
   
5. Lift the power supply out of the chassis.

System Power Supply Installation

To reinstall the system power supply, align the swivel points at the rear of the power supply with the holes in the chassis and power supply support arm. Then perform the removal procedure in reverse.

System Board Components

Figure 14 shows the system board and the location of all its sockets and connectors.

Figure 14. System Board Components

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 Riser board connector 9 System board jumpers 10 IDE1 connector 11 IDE2 connector 12 Diskette/tape-drive connector 13 Battery 14 Microprocessor 15 3.3-V power connector 16 Control panel connector 17 DC power connector 18 Auxiliary power indicator 19 DIMM connectors (2)

System Board Jumpers

Figure 15 shows the location of the jumpers on the system board. Table 1 lists the system board jumpers and their settings.

Figure 15. System Board Jumpers

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 that 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 carefully fit it down onto the pin(s) indicated.

Dell shipped your computer with a PSWD jumper installed, meaning that the 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 system accommodates up to six expansion cards, including up to five 32-bit PCI expansion cards and one 32-bit AGP card. (See Figure 16 for examples of these cards.)

NOTE: Before disconnecting a peripheral from the system or removing a component from the system board, verify that the standby power LED on the system board is off. For the location of this LED, see Figures 19 and 20.

Figure 16. Expansion Cards

1 8-bit ISA expansion card 2 16-bit ISA expansion card 3 32-bit PCI expansion card

Expansion-Card Removal

To remove an expansion card, perform the following steps:

1. Remove the computer cover.
   
   

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.

Figure 17. Expansion Card Removal

1 Card-edge connector 2 Expansion card 3 Riser board 4 Expansion-card connector 5 Expansion-card cage

Expansion-Card Replacement

To replace an expansion card, perform the following steps.

CAUTION: See "Precautionary Measures."

1. Prepare the expansion card for installation, and remove the computer cover.
   

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.

CAUTION: Some network cards automatically start up the system when they are connected. To guard against electric shock, be sure to unplug your computer from its electrical outlet before installing any expansion cards.

Figure 18. Removing the Filler Bracket

1 Filler bracket

Riser Boards

The midsize chassis is available with either a PCI riser board (see Figure 19) or a PCI/ISA riser board (see Figure 20). The PCI riser board provides five PCI expansion card slots. The PCI/ISA riser board provides two PCI expansion slots, two ISA expansion slots, and one shared PCI/ISA expansion slot.

Figure 19. Midsize Chassis PCI Riser Board

1 Standby power indicator (AUX_LED) 2 PCI expansion slot 5 (PCI5) 3 PCI expansion slot 4 (PCI4) 4 Remote Wakeup header (WOL) 5 PCI expansion slot 1 (PCI1) 6 PCI expansion slot 2 (PCI2) 7 PCI expansion slot 3 (PCI3)

Figure 20. PCI/ISA Riser Board

1 Standby power indicator LED (AUX_LED) 2 ISA expansion slot 3 (ISA3) 3 ISA expansion slot 2 (ISA2) 4 ISA expansion slot 1 (ISA1) 5 Remote Wakeup header (WOL) 6 PCI expansion slot 1 (PCI1) 7 PCI expansion slot 2 (PCI2) 8 PCI expansion slot 3 (PCI3)

DIMMs

Figure 21. DIMM Removal

1 Ejectors (2)

CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."

To remove a DIMM, perform the following steps:

1. Unlatch and rotate the power supply up until it locks (see Figure 13).
   
   
2. Push outward on the two DIMM socket ejectors simultaneously until the DIMM is released from its socket.
   
   
3. 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 22).

Figure 22. DIMM Installation

1 Ejectors (2) 2 Notches (2)

Microprocessor/Heat Sink Assembly

To replace a microprocessor, perform the following steps:

1. Remove the computer cover.
   
   
2. Locate the microprocessor socket on the system board.
   
   
3. Gently pull out the guide-bracket assembly latch, grasp the existing microprocessor/heat sink assembly firmly, and pull straight up to remove it from the guide bracket assembly.
   
   You must use up to 15 pounds of force to disengage the microprocessor package from the connector. Do not rock the package while removing it.
   
   
4. Slide the new microprocessor package into the guide bracket assembly, with the heat sink toward the front of the computer, and firmly seat the microprocessor/heat sink assembly.
   
   You must use up to 25 pounds of force to seat the new microprocessor package. Do not rock the package while inserting it into the connector.

Figure 23. Microprocessor Removal

1 Guide bracket assembly 2 Guide bracket assembly latch 3 Heat sink

System Battery

Figure 24. System Battery Removal

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.

To remove the system battery, perform the following steps:

1. If possible, enter System Setup and print the System Setup screens.
   
   
2. Remove the computer cover.
   
   
3. 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.

System Board

Figure 25. System Board Removal

To remove the system board, perform the following steps:

1. Remove the computer cover.
   
   
2. Disconnect all cables from their connectors at the back of the computer.
   
   
3. Disconnect all cables from the system board.
   
   
4. Rotate the system power supply.
   
   
5. Remove the DIMMs.
   
   
6. Remove the microprocessor.
   
   
7. Remove the AGP card brace and the AGP video card.
   
   
8. Slide all externally accessible drives and brackets partially out of the chassis.
   
   
9. Slide the hard-disk drive partially out of the chassis.
   
   
10. Remove the screw that secures the system board to the bottom of the chassis. (See Figure 25.)
    
    
11. Slide the system board toward the front of the chassis until it stops.
    
    
12. Carefully raise the front of the system board and lift the board out of the chassis at an angle.

To replace the system board, perform the following steps:

1. Carefully replace the system board in the chassis by performing step 12 of the removal process in reverse.
   
   
2. Push down near each slot to engage the grounding clip onto its corresponding tab.
   
   
3. Push evenly on both sides of the system board as you slide and lock it into position (do not twist the system board).
   
   
4. Reinstall the mounting screw.
   
   
5. Reinstall all components on the system board by performing steps 4 through 9 of the removal process in reverse.
   
   
6. 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.

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