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8. Close the microprocessor retainer and clamp it with the small handle.
9. Place the heat sink into position and replace the 4 screws to secure the heat sink to the system board.
10. Reconnect the heat sink fan cable.
11. Go to “Completing the FRU replacement” on page 108.
Replacing the system board
CAUTION:
The heat sink, microprocessor, and memory module might be very hot. Turn off the
computer and wait three to ve 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. To obtain a copy of the ThinkStation
Safety and Warranty Guide, go to:
http://www.lenovo.com/support.
Note: When replacing the system board a new retention module for the microprocessor heat sink is required.
Make sure you have a new retention module before beginning this procedure.
This section provides instructions on how to remove and install the system board.
To replace the system board:
1. Open the cover. See “Removing the cover” on page 78.
2. Lay the computer on its side for easier access to the system board.
3. Remove the hard disk drive fan. See “Replacing the hard disk drive fan assembly” on page 100.
4. Remove any adapter cards installed in the PCI connectors. See “Replacing a PCI adapter card” on
page 86.
5. Remove the memory modules from the failing system board.
6. Remove the heat sink from the failing system board. See “Replacing the heat sink” on page 90.
7. Note the location of all cable connections on the system board and disconnect all cables. See “Locating
parts on the system board ” on page 113
.
8. Remove the nine screws that secure the system board to the chassis, following the sequence shown in
the gure:
124 ThinkStation Hardware Maintenance Manual