Compaq 470007-802 Deskpro EN Series of Personal Computers Maintenance and Serv - Page 74

System Board

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4.19 System Board ✎ 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). WARNING: Power is continuous to the system board and power supply even when the power switch is turned off. To prevent damage to the unit, disconnect the power cord from the power source or the unit before beginning disassembly procedures. 2. Lay the computer down on its large base (side with feet) for greater stability. 3. Remove the access panel (Section 4.6). 4. Remove all PCI expansion boards (Section 4.13.2). 5. Disconnect any cables that are attached to the system board, noting their location for reinstallation. 6. Remove the DIMMs (optional) (Section 4.16). 7. Remove the graphics card (Section 4.17). 8. Remove the processor (Section 4.18). 9. Remove the six retaining screws that secure the system board to the chassis. 10. Slide the board about ½ inch toward the front of the chassis to disengage the I/O panel, then lift it up and out of the chassis. To install a new system board, reverse the above procedures. Compaq Deskpro EN Series of Personal Computers 4-37

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Compaq Deskpro EN Series of Personal Computers
4-37
4.19
System Board
✎
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).
WARNING:
Power is continuous to the system board and power supply even when the power
switch is turned off. To prevent damage to the unit, disconnect the power cord from the power
source or the unit before beginning disassembly procedures.
2.
Lay the computer down on its large base (side with feet) for greater stability.
3.
Remove the access panel (Section 4.6).
4.
Remove all PCI expansion boards (Section 4.13.2).
5.
Disconnect any cables that are attached to the system board, noting their location for
reinstallation.
6.
Remove the DIMMs (optional) (Section 4.16).
7.
Remove the graphics card (Section 4.17).
8.
Remove the processor (Section 4.18).
9.
Remove the six retaining screws that secure the system board to the chassis.
10.
Slide the board about ½ inch toward the front of the chassis to disengage the I/O panel,
then lift it up and out of the chassis.
To install a new system board, reverse the above procedures.