Lenovo ThinkCentre E93z, Hardware Maintenance Manual, Page: 104 / 142

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. Position the new heat sink assembly on the system board so that the four screws on the new heat sink
assembly are aligned with the corresponding holes in the system board.
9. Follow the following sequence to install the four screws to secure the new heat sink assembly. Do
not over-tighten the screws.
a. Partially tighten screw 1 , then fully tighten screw 2 , and then fully tighten screw 1 .
b. Partially tighten screw
3
, then fully tighten screw
4
, and then fully tighten screw
3
.
Figure 38. Tightening the four screws to secure the heat sink assembly
10. Reinstall the system board shield. See “Removing and reinstalling the system board shield” on page 86.
Replacing 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.
Attention:
Do not open your computer or attempt any repair before reading and understanding the “Important safety information”
on page 1.
This section provides instructions on how to replace the microprocessor.
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.
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ThinkCentre E93z Hardware Maintenance Manual