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9. Follow the sequence 1 , 2 , 3 , 4 on the heat sink assembly to tighten the four screws to secure the heat
sink assembly to the system board, as shown in Figure 27 “Loosing the four screws that secure the heat
sink assembly to the system board” on page 102.
10. Reinstall the system board shield. See “Removing and reinstalling the system board shield” on page 98.
11. Go to “Completing the parts replacement” on page 121.
Replacing the microprocessor
Attention
Do not open your computer or attempt any repair before reading and understanding the “Important safety
information” in the ThinkCentre Edge Safety and Warranty Guide that came with your computer. To obtain a
copy of the ThinkCentre Edge Safety and Warranty Guide, go to:
http://www.lenovo.com/support
This section provides instructions on how to replace the microprocessor.
CAUTION:
The heat sink and fan assembly might be very hot. Turn off the computer and wait three to ve
minutes to let the computer cool before removing the computer cover.
To replace the microprocessor, 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 other at 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.
3. Remove the computer cover. See “Removing the computer cover” on page 91.
4. Locate the microprocessor on the system board. See “FRU locations” on page 82.
5. Remove the system board shield. See “Removing and reinstalling the system board shield” on page 98.
6. Remove the heat sink assembly to gain access to the microprocessor. See “Replacing the heat sink
assembly” on page 101.
7. Press the small handle 1 to open the retainer 2 to access the microprocessor 3 .
Chapter 8. Replacing FRUs 103