Dell™ OptiPlex™ GX400 Service Manual Before You Begin Computer Cover Inside Your Computer System Board Components Front Panel Front-Panel Inserts Front-Panel Buttons Power Supply System Memory Disk Drives and Media AGP Card Brace Expansion Cards Expansion-Card Guide Control Panel Chassis Intrusion Switch Microprocessor Airflow Shroud Microprocessor Microprocessor Cooling Fan VRM Computer Battery System Board Notes, Notices, and Cautions NOTE: A NOTE indicates important information that helps you make bette
Back to Contents Page AGP Card Brace Dell™ OptiPlex™ GX400 Service Manual Removing the AGP Card Brace Replacing the AGP Card Brace Removing the AGP Card Brace To access some components on the board, you may need to remove the AGP card brace. NOTE: Your computer has either an AGP card brace or an AGP card clip. CAUTION: Before you perform this procedure, see "Precautionary Measures." 1.
Back to Contents Page Computer Battery Dell™ OptiPlex™ GX400 Service Manual Removing the Computer Battery Replacing the Computer Battery Removing the Computer Battery CAUTION: There is a danger of the new battery exploding if it is installed incorrectly. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer's instructions. CAUTION: Before you perform this procedure, see "Precautionary Measures.
Back to Contents Page Before You Begin Dell™ OptiPlex™ GX400 Service Manual Precautionary Measures Recommended Tools Restarting the Computer Precautionary Measures Before you remove the computer cover, perform the following steps in the sequence indicated. 1. Turn off your computer and any devices. 2. Disconnect your computer and devices from their power sources. Also, disconnect any telephone or telecommunication lines from the computer. Doing so reduces the potential for personal injury or shock.
Back to Contents Page Chassis Intrusion Switch Dell™ OptiPlex™ GX400 Service Manual Removing the Chassis Intrusion Switch Replacing the Chassis Intrusion Switch Removing the Chassis Intrusion Switch CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components." 1.
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Back to Contents Page Control Panel Dell™ OptiPlex™ GX400 Service Manual Components Removing the Control Panel Replacing the Control Panel Components The following figure shows the control panel and the location of its principal connectors and components. Control Panel Components Removing the Control Panel CAUTION: Before you perform this procedure, see "Precautionary Measures.
Replacing the Control Panel To replace the control panel, perform the removal procedure in reverse.
Back to Contents Page Computer Cover Dell™ OptiPlex™ GX400 Service Manual Removing the Computer Cover Replacing the Computer Cover Removing the Computer Cover CAUTION: Before you perform this procedure, see "Precautionary Measures." 1. Turn off the computer and peripherals, and disconnect them from their electrical outlets. 2. If installed, remove the padlock from the padlock ring on the back panel. 3. Remove the computer cover. a.
b. Rotate the cover downward toward the bottom of the chassis. With both hands, press against the bottom edge of the cover to ensure that the securing hooks at the bottom of the cover click into place. Replacing the Cover c. Slide the two parts of the padlock ring together to lock the cover release mechanism.
Back to Contents Page Disk Drives and Media Dell™ OptiPlex™ GX400 Service Manual Drive Location Removing the Floppy Drive Replacing the Floppy Drive Removing a CD, Zip, or Other External Drive Replacing a CD, Zip, or Other External Drive Removing a Hard Drive Replacing a Hard Drive Drive Location Drive Locations Removing the Floppy Drive CAUTION: Before you perform this procedure, see "Precautionary Measures.
5. Press the green floppy-drive bracket release button and slide the drive assembly out of the chassis. Removing the Floppy-Drive Bracket 6. Remove the mounting screw. 7. Rotate the left side of the floppy drive upward and lift it free from the drive bracket. Removing the Floppy Drive from the Bracket Replacing the Floppy Drive 1. Mount the floppy drive on the bracket: a.
Removing a CD, Zip, or Other External Drive CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components." 1. Turn off the computer and devices, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover. 2.
Replacing a CD, Zip, or Other External Drive 1. Attach the new drive to the drive bracket. Turn the drive upside down, and fit the bracket on the drive so that the screw holes align. To ensure proper installation, all screw holes should be aligned and the tabs on the front of the bracket should be flush with the front of the drive (see "Removing the Drive from the Bracket").
4. a. If you are installing an EIDE device, ensure that the interface cable is properly connected to the EIDE connector on the system board. b. If you are installing a SCSI device, ensure that the SCSI interface cable is properly connected to the interface connector on the SCSI controller board. Connect a DC power cable to the power input connector on the back of the drive. Attaching Drive Cables 5. Ensure that all cables are firmly connected.
Removing a Hard Drive CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components." 1. Turn off the computer and devices, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover. 2.
Replacing a Hard Drive 1. Slide the drive into one of bracket bays, oriented so that the connectors on the back of the drive will face the interior of the chassis when the bracket is reinstalled. See "Removing a Hard Drive from the Bracket." NOTE: Orient the drive in the bracket so that its bottom will face the left side of the chassis when the bracket is installed in the chassis. 2.
b. 5. If you are installing a SCSI device, ensure that the SCSI interface cable is properly connected to the interface connector on the SCSI controller board. Connect a DC power cable to the power input connector on the back of the drive. Attaching Hard-Drive Cables 6. Ensure that all cables are firmly connected. Fold cables out of the way to provide airflow for the fan and cooling vents. 7. Ensure that the control panel cable is firmly connected to the system board.
Back to Contents Page Expansion Cards Dell™ OptiPlex™ GX400 Service Manual Expansion Card Types Removing an Expansion Card Expansion Card Types l Up to five 32-bit, 33-MHz PCI expansion cards. l One 32-bit AGP card. The expansion slot supports AGP 4x or 2x Pro50 modes operating at 1.5 V. Expansion Card Types Removing an Expansion Card CAUTION: Before you perform this procedure, see "Precautionary Measures.
4. If necessary, disconnect any cables connected to the card. 5. Remove the screw that secures the expansion card bracket to the chassis. Save the screw to use when installing the expansion card or filler bracket later in this procedure. NOTICE: Do not rock the AGP card when removing it from the socket. 6. Grasp the card by its top corners and ease it out of its connector. Removing an Expansion Card 7.
b. 13. Connect external audio devices to the audio connectors on the back panel. If you removed an add-in network adapter, perform the following steps: a. Enter system setup, select Integrated Devices and change the setting for Network Interface Card to On. b. Connect the network cable to the integrated network adapter connector on the back panel.
Back to Contents Page Expansion-Card Guide Dell™ OptiPlex™ GX400 Service Manual Removing the Expansion-Card Guide Replacing the Expansion-Card Guide Removing the Expansion-Card Guide CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components." 1.
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Back to Contents Page Front Panel Dell™ OptiPlex™ GX400 Service Manual Removing the Front Panel Replacing the Front Panel Removing the Front Panel CAUTION: Before you perform this procedure, see "Precautionary Measures." 1. Turn off the computer and devices, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover. 2. Release the front panel by pressing the green front-panel release button marked with the icon. Removing the Front Panel 3.
Back to Contents Page Front-Panel Buttons Dell™ OptiPlex™ GX400 Service Manual Removing Front-Panel Buttons Replacing Front-Panel Buttons Removing Front-Panel Buttons 1. Turn off the computer and devices, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover. 2. Remove the front panel. 3. Lay the front panel down, with the inside of the panel facing up. 4.
Back to Contents Page Front-Panel Inserts Dell™ OptiPlex™ GX400 Service Manual Removing Front-Panel Inserts Replacing Front-Panel Inserts Removing Front-Panel Inserts CAUTION: Before you perform this procedure, see "Precautionary Measures." 1. Turn off the computer and devices, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover. 2. Remove the front panel. 3. Hold the front panel with the front facing you. 4.
Back to Contents Page Inside Your Computer Dell™ OptiPlex™ GX400 Service Manual Chassis Interior Chassis Interior Chassis Interior NOTE: Before you remove the cover, you must first slide the outer padlock ring to the left to unlock the cover release mechanism. See "Cover Release Mechanism." NOTE: Your computer may have an AGP clip instead of an AGP card brace.
Back to Contents Page System Memory Dell™ OptiPlex™ GX400 Service Manual Removing a Memory Module Replacing a Memory Module Removing a Memory Module CAUTION: Before you perform this procedure, see "Precautionary Measures." CAUTION: RIMMs can get very hot during system operation. Be sure that the RIMMs have had sufficient time to cool before you touch them.
2. Rotate the power supply back into position until the securing tab snaps into the release latch. 3. Stand the computer upright. 4. Replace the computer cover and restart the computer. The computer detects that the new memory does not match the existing configuration information and generates the following message: The amount of system memory has changed. Strike the F1 key to continue, F2 to run the setup utility 5. Enter system setup, and check the value for System Memory.
Back to Contents Page Microprocessor Dell™ OptiPlex™ GX400 Service Manual Removing the Microprocessor Replacing the Microprocessor Removing the Microprocessor CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components." 1.
To remove the microprocessor, pull the socket lever straight up until the microprocessor is released. Then remove the microprocessor from the socket. Removing the Microprocessor Replacing the Microprocessor NOTICE: Do not reuse the old heat sink assembly when replacing the microprocessor package. Doing so can cause the microprocessor to overheat because of an inadequate amount of thermal compound between the heat sink assembly and the microprocessor package. 1.
2. Install the microprocessor heat sink: NOTICE: If you are installing a microprocessor upgrade kit from Dell, remove the plastic cover that is attached to the bottom of the new heat sink before installing it. a. Lower the heat sink to the microprocessor so that the heat sink fits in the heat sink retention base. b. For each of the replacement metal clips that secure the heat sink to the microprocessor, fit the end of the clip that does not have the latch to the heat sink retention base.
Back to Contents Page Microprocessor Cooling Fan Dell™ OptiPlex™ GX400 Service Manual Removing the Microprocessor Cooling Fan Replacing the Microprocessor Cooling Fan Removing the Microprocessor Cooling Fan CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power lights on the system board has turned off. To locate this light, see "System Board Components.
Back to Contents Page Microprocessor Airflow Shroud Dell™ OptiPlex™ GX400 Service Manual Removing the Microprocessor Airflow Shroud Replacing the Microprocessor Airflow Shroud Removing the Microprocessor Airflow Shroud CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power light on the system board has turned off.
Back to Contents Page Power Supply Dell™ OptiPlex™ GX400 Service Manual Rotating the Power Supply Removing the Power Supply Replacing the Power Supply Rotating the Power Supply To access some of the components on the system board, you may need to rotate the power supply out of the way. CAUTION: Before you perform this procedure, see "Precautionary Measures." 1. Turn off the computer and devices, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover.
7. Disengage the pivot pin on the left rear of the power supply from the chassis socket. Removing the Power Supply 8. Lift the power supply away from the chassis. Replacing the Power Supply 1. Insert the pivot pin on the left rear of the power supply into the chassis socket. 2. Insert the retention arm pin on the left side of the power supply in the retention arm socket. 3. Rotate the right side of the power supply toward the chassis.
Back to Contents Page System Board Dell™ OptiPlex™ GX400 Service Manual Removing the System Board Replacing the System Board Removing the System Board CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components." 1.
Replacing the System Board 1. Lower the system board into the chassis at an angle, with the I/O panel connectors lowered into the chassis. 2. Carefully push down evenly on both sides of the system board to engage the grounding clips onto their respective chassis tabs. NOTICE: Do not twist the system board as you position it in the chassis. 3. Slide the system board toward the rear of the chassis until it stops. This locks the system board into position. 4. Replace the system board mounting screw. 5.
Back to Contents Page System Board Components Dell™ OptiPlex™ GX400 Service Manual Components Labels Jumpers Components System Board Components Labels System-Board Labels Connector or Component Label AGP AGP connector AUX_LED Auxiliary hard-drive access light connector BATTERY Battery socket CD_IN CD audio input connector CPU_POWER Microprocessor power connector DS1 Diagnostic lights DSKT Floppy-drive connector FAN Microprocessor fan connector IDE1 Primary EIDE connector IDE2 Second
L_IN Line-in connector L_OUT Line-out/speaker connector MIC Microphone connector MICROPROCESSOR Microprocessor with heat sink MSE PS/2 mouse connector NIC Network adapter connector PANEL Control-panel connector PAR Parallel port connector PCIn PCI expansion-card connector POWER Computer power connector PSWD Password jumper RIMM_n RIMM socket RTCRST Real-time clock reset jumper SER Serial port connectors SPKR Internal speaker STANDBY_LED Standby power light STR Suspend-to-RAM
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Back to Contents Page Dell™ OptiPlex™ GX400 Service Manual Notes, Notices, and Cautions Notes, Notices, and Cautions NOTE: A NOTE indicates important information that helps you make better use of your computer. 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.
Back to Contents Page VRM Dell™ OptiPlex™ GX400 Service Manual Removing the VRM Replacing the VRM Removing the VRM CAUTION: Before you perform this procedure, see "Precautionary Measures." NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components." 1.
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