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When you replace the 3.5-inch diskette drive, be sure the mounting holes on the right side of the drive engage the two hooks on the bracket. 4-8 Dell OptiPlex GXi Systems Service Manual 5.25-Inch Drive Assembly drive-mounting screws (4) front of computer Figure 4-7. 5.25-Inch Drive Assembly Removal To remove a 5.25-inch drive assembly, follow these steps: 1. Remove the 3.5-inch diskette drive assembly. 2. Disconnect the DC power cable and the interface cable from the back of the 5.25-inch drive. 3. Lift the 5.25-inch drive assembly straight up and out of the chassis. 4. Lay the 5.25-inch drive assembly upside down, then remove the four screws attaching the drive to the bracket. When you replace the 5.25-inch drive, place the front of the drive toward the front of the bracket; then install the four screws but do not tighten them. Align the screws with the score marks on the bracket, and tighten the screws in the order stamped on the bottom of the bracket. Check the alignment of the computer cover around the 5.25-inch drive bezel. Adjust the drive forward or backward on the bracket to align it. Removing and Replacing Parts on the Low-Profile Chassis 4-9 Hard-Disk Drive Assembly captive screw tabs notches hard-disk drive mounting screws (4) front of computer Figure 4-8. Hard-Disk Drive Assembly Removal To remove the hard-disk drive, follow these steps: 1. Disconnect the DC power cable and the interface cable from the back of the drive. 2. Loosen the captive screw that secures the hard-disk drive bracket to the chassis. 3. Pivot the hard-disk drive assembly up, then lift it out of the chassis. 4. Remove the four hard-disk drive mounting screws that attach the hard- disk drive to the hard-disk drive bracket. When you reinstall the hard-disk drive assembly, be sure the tabs on the back of the mounting plate fully engage in the notches on the chassis before you rotate the assembly into place. 4-10 Dell OptiPlex GXi Systems Service Manual Removing and Replacing Parts on the Low-Profile Chassis 4-11 System Power Supply Figure 4-9. System Power-Supply Removal To remove the system power supply, follow these 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 power-supply mounting screw at the back of the chassis. 4. Slide the system power supply forward until it stops; then lift it from the chassis. When you replace the system power supply, place it down inside the chassis and against the right side of the chassis. Then slide the system power supply toward the back of the chassis, and hook the tabs into the right side of the power supply. power supply power-supply mounting screw 4-12 Dell OptiPlex GXi Systems Service Manual System Board Components The subsections that follow Figure 4-10 contain procedures for removing system board and riser board components. Figure 4-10. System Board Components primary EIDE connector (IDE1) video connector (MONITOR) parallel/serial port connectors (stacked) (PARALLEL/SERIAL) diskette/tape drive interface connector (DSKT) riser board connector (RISER) secondary EIDE connector (IDE2) NIC daughterboard connector (NETWORK) system board jumpers microprocessor fan connector (FAN) battery socket (BATTERY) control-panel connector (PANEL) 3.3-V power input connector (POWER2) keyboard/mouse connectors (stacked) (KYBD/MOUSE) main power input connector (POWER1) microprocessor socket (MICROPROCESSOR) DIMM sockets (4) USB connectors (USB) front of computer cache-memory card connector (CACHE) line-in jack (LINE-IN) line-out jack (LINE-OUT) microphone jack (MIC) CD-ROM interface connector (CD_IN) Removing and Replacing Parts on the Low-Profile Chassis 4-13 Expansion Cards The computer has a removable expansion-card cage. The expansion-card cage contains the riser board and any installed expansion cards. Dell recommends that you remove the expansion-card cage first before removing or installing expansion cards. If you are not removing any of the expansion cards, leave the external cables attached to the expansion cards. Expansion-Card Cage Figure 4-11. Expansion-Card Cage Removal To remove an expansion-card cage, follow these 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 it flush against the chassis to ensure that the lever engages the notch in the chassis when the lever is depressed. lever expansion-card cage notch chassis Expansion Card expansion card card-slot opening card-mounting bracket retaining screw expansion-card connector riser board Figure 4-12. Expansion-Card Removal To remove an expansion card, follow these steps: 1. Disconnect any external cables from the expansion card being removed. 2. Remove the expansion-card cage. 3. Remove the retaining screw from the card-mounting bracket. 4. Grasp the expansion card by its corners, and...