Replacing The Microprocessor - Lenovo ThinkCentre Edge 91z Hardware Maintenance Manual

Figure 28. Loosing the four screws that secure the heat sink assembly to the system board
7. Lift the failing heat sink assembly off the system board.
Notes:
a. You might have to gently twist the heat sink assembly to free it from the microprocessor.
b. Do not touch the thermal grease while handling the heat sink assembly.
8. To reinstall the heat sink assembly, position the new heat sink assembly on the system board so that the
four screws are aligned with the corresponding holes in the system board.
9. Follow the sequence
sink assembly to the system board, as shown in Figure 28 "Loosing the four screws that secure the heat
sink assembly to the system board" on page 108.
10. Reinstall the system board shield. See "Removing and reinstalling the system board shield" on page 102.
11. Go to "Completing the parts replacement" on page 127.

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 five
minutes to let the computer cool before removing the computer cover.
To replace the microprocessor, do the following:
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, , , on the heat sink assembly to tighten the four screws to secure the heat