Replacing The Heat Sink - Lenovo ThinkCentre Hardware Maintenance Manual

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See "Opening the computer cover" on page 68.
3. Remove the front bezel. See "Removing and reinstalling the front bezel" on page 69.
4. Disconnect the front audio and USB assembly cables from the system board and note the cables
routing. See "Locating parts on the system board" on page 67.
5. Remove the screw that secures the front audio and USB assembly to the chassis.
Figure 11. Removing the front audio and USB assembly
6. Locate the power switch assembly beside the front audio and USB assembly. Remove the power switch
assembly by releasing the tab that secures the power switch assembly to the chassis.
7. Completely remove the failing front audio and USB assembly from the chassis.
8. Install the new front audio and USB assembly into the chassis and align the screw hole in the front audio
and USB assembly with the corresponding hole in the chassis.
9. Install the screw to secure the new front audio and USB assembly to the chassis.
10. Install the new power switch assembly into the chassis.
11. Connect the front USB, front panel, and front audio cables to the system board. See "Locating parts on
the system board" on page 67.
12. Reinstall the front bezel. See "Removing and reinstalling the front bezel" on page 69.
13. Go to "Completing the parts replacement" on page 87.

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.
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Chapter 8 Replacing FRUs
73