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8. To reinstall the microprocessor fan assembly, position the new microprocessor fan assembly on the
system board and align the three screw holes in the new microprocessor fan assembly with those
in the system board.
9. Tighten the three screws to secure the microprocessor fan assembly to the system board.
Figure 19. Removing the microprocessor fan assembly
10. Connect the microprocessor fan assembly cable to the system board. See "System board parts and
connectors" on page 71.
11. Reinstall the wall mount. See "Removing or reinstalling the wall mount" on page 82.
12. Reinstall the hard disk drive. See "Replacing the hard disk drive" on page 74.
13. Go to "Completing the parts replacement" on page 113.
Replacing the heat sink
Attention
Do not open your computer or attempt any repair before reading and understanding the "Important safety
information" in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy
of the ThinkCentre Safety and Warranty Guide, go to:
http://www.lenovo.com/support
This section provides instructions on how to replace the heat sink.
CAUTION:
The heat sink might be very hot. Turn off the computer and wait three to five minutes to
let the computer cool before removing the computer cover.
To replace the heat sink, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay
it down so that the screen is against the surface and the cover is facing up.
.
Chapter 8
Replacing FRUs
87
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