Dell Precision 220 Service Manual page 43

To remove the system board, perform the following steps.
NOTE: Before disconnecting a peripheral from the system or removing a component from the system board, disconnect the system
power cord and verify that the standby power LED on the system board is off. For the location of this LED, see
CAUTION: Before you remove the computer cover, see
1. Remove the computer cover.
2. Disconnect all cables from their connectors at the back of the computer.
Rotate the system power
3.
4. Disconnect all cables from the system board.
5. Remove the RIMMs.
Remove the airflow shroud, the primary processor, and the secondary processor or terminal
6.
Remove the AGP card brace
7.
8. Slide all externally accessible drives and brackets partially out of the chassis.
9. Slide the hard-disk drive bracket partially out of the
Remove the microprocessor cooling
10.
11. Remove the screw that secures the system board to the bottom of the chassis.
12. Slide the system board toward the front of the chassis until it stops.
13. 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 11 through 13 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 10 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.
7. Replace the computer cover, connect cables, and turn on the power. Run the System Setup
program to ensure your settings are correct and all system board components are correctly
reported.
8. Run the Dell Diagnostics.
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supply.
and the AGP video card.
chassis.
fan.
"Precautionary Measures"
card.
Figure 25.