Lenovo ThinkCentre M92z Hardware Maintenance Manual - ThinkCentre M92z (type 3 - Page 98

Replacing the microprocessor, Partially tighten screw

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b. Partially remove screw 3 , then fully remove screw 4 , and then fully remove screw 3 . Note: Carefully remove the four screws from the system board to avoid any possible damage to the system board. The four screws cannot be removed from the heat sink. Figure 23. Removing the heat sink 6. Remove the failing heat sink off the system board. Notes: a. You might have to gently twist the heat sink to free it from the microprocessor. b. Do not touch the thermal grease while handling the heat sink. 7. Position the new heat sink on the system board so that the four screws are aligned with the corresponding holes in the system board. 8. Follow this sequence to install the four screws to secure the heat sink, as shown in Figure 23 "Removing the heat sink" on page 94. 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 . What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, 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 "Important Safety Information" on page 1. 94 ThinkCentre Hardware Maintenance Manual

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b. Partially remove screw
3
, then fully remove screw
4
, and then fully remove screw
3
.
Note:
Carefully remove the four screws from the system board to avoid any possible damage to the
system board. The four screws cannot be removed from the heat sink.
Figure 23. Removing the heat sink
6. Remove the failing heat sink off the system board.
Notes:
a.
You might have to gently twist the heat sink to free it from the microprocessor.
b. Do not touch the thermal grease while handling the heat sink.
7. Position the new heat sink on the system board so that the four screws are aligned with the
corresponding holes in the system board.
8. Follow this sequence to install the four screws to secure the heat sink, as shown in Figure 23 “Removing
the heat sink” on page 94.
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
.
What to do next:
•
To work with another piece of hardware, go to the appropriate section.
•
To complete the installation or replacement, 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 “Important Safety Information”
on page 1.
94
ThinkCentre Hardware Maintenance Manual