CAUTION:

The heat sink, microprocessor, and memory module might be very hot. Turn off the computer and wait three to five minutes to let the computer cool before opening the computer cover.

Attention:
Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkStation Safety and Warranty Guide that came with your computer.

This section provides instructions on how to remove and install the system board.

To replace the system board:

1. Open the cover. See "Cover removal".
2. Lay the computer on its side for easier access to the system board.
3. Remove any adapter cards installed in the PCI connectors. See "PCI adapter card removal and installation".
4. Remove the hard disk drive fan. See "Hard disk drive fan assembly removal and installation".
5. Note the location of all cable connections on the system board and disconnect all cables. See "Locating parts on the system board".
6. Remove the nine screws that secure the system board to the chassis, following the sequence shown in the figure:

7. Lift the system board out of the chassis.
8. Remove the memory modules from the failing system board.
9. Remove the heat sink from the failing system board. See "Heat sink removal and installation".
10. Remove the microprocessor from the failing system board and install it on the new system board. See "Microprocessor removal and installation".
11. Install the new system board into the chassis and align the screw holes with those in the chassis. Insert and tighten the screws that secure the system board following the sequence shown in the figure above.
12. Install the memory modules in the same location on the new system board.
13. Install the microprocessor on the new system board. See "Microprocessor removal and installation".
14. Install the heat sink and fan assembly on the new system board. See "Heat sink removal and installation".
15. Connect the heat sink and fan assembly cable to the new system board. See "Locating parts on the system board".
16. Install the hard disk drive fan. See "Hard disk drive fan assembly removal and installation".
17. Connect all cables to the system board. See the system board illustration for your machine type at "Locating parts on the system board".
18. Go to "Completing the FRU replacement".