Dell OptiPlex GXa Service Manual - Page 141

System Board

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System Board screw slots (5) tabs (5) Figure 6-19. System Board Removal To remove the system board, follow these 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). NOTES: If you are replacing the system board, remove all DIMMs, the videomemory upgrade module (if present), the single-edge contact (SEC) cartridge/ heat sink assembly, and the guide bracket assembly from the old system board and install them on the replacement board. Also, set the jumpers on the new system board so they are identical to those on the old board, unless a microprocessor upgrade is being installed. If the original system board is an EM system board type, replace with an EM system board type. Also, if the original system board is equipped with a NIC connector, ensure that the replacement board contains a NIC connector. When you reinstall the system board (before you slide the system board back to lock it in position), push down near each slot to engage the grounding clip onto its corresponding tab. Push evenly on both sides of the system board as you slide it into position (do not twist the system board). Removing and Replacing Parts on the Mini Tower Chassis 6-21

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Removing and Replacing Parts on the Mini Tower Chassis
6-21
S
ystem Board
Figure 6-19.
System Board Removal
To remove the system board, follow these 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).
NOTES: If you are replacing the system board, remove all DIMMs, the video-
memory upgrade module (if present), the single-edge contact (SEC) cartridge/
heat sink assembly, and the guide bracket assembly from the old system board
and install them on the replacement board. Also, set the jumpers on the new
system board so they are identical to those on the old board, unless a micro-
processor upgrade is being installed.
If the original system board is an EM system board type, replace with an EM
system board type. Also, if the original system board is equipped with a NIC
connector, ensure that the replacement board contains a NIC connector.
When you reinstall the system board (before you slide the system board back to
lock it in position), push down near each slot to engage the grounding clip onto
its corresponding tab. Push evenly on both sides of the system board as you
slide it into position (do not twist the system board).
screw
slots (5)
tabs (5)