System Board - Compaq 133756-004 - Deskpro EN - 6550 Model 6400 Maintenance & Service Manual

4.17

System Board

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More information on the system board, including troubleshooting criteria, can be
found in the Compaq Quick Troubleshooting Guide (part number 153837-001)
and the Compaq Service Reference Guide (part number 152611-001).
1. Prepare the computer for disassembly (Section 4.2).
2. Remove the computer cover (Section 4.6).
3. Remove the expansion card cage (Section 4.14.1).
4. Remove the I/O panel (Section 4.16).
5. Rotate the drive cage to the upright position.
CAUTION: Check the position of all cables and wires before raising or lowering the drive cage to
prevent cable damage.
6. Rotate the power supply to the upright position.
7. Disconnect all cables from the system board.
8. Slide system board toward the rear of computer until the six metal standoffs that extend
up from the base pan are positioned in the larger part of the keyhole slots in the system
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board
9. Raise the rear of the system board until it is at a 30 degree angle
10. Remove the system board by pulling it toward the rear of the computer, then lifting it
up and out of the chassis
To replace the system board, reverse the removal procedures.
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Compaq Deskpro EN Series of Personal Computers 4-25