Lenovo ThinkCentre M91p (English) User Guide - Page 52

Follow this sequence to install the four screws to secure the new heat sink, as shown

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2. Open the computer cover. See "Opening the computer cover" on page 28. 3. Locate the heat sink. See "Locating components" on page 10. 4. Follow this sequence to remove the four screws that secure the heat sink to the system board: a. Partially remove screw 1 , then fully remove screw 2 , and then fully remove screw 1 . 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 22. Removing the heat sink 5. Carefully lift the 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. 6. Position the new heat sink on the system board so that the four screws are aligned with the holes on the system board. 7. Follow this sequence to install the four screws to secure the new heat sink, as shown in Figure 22 "Removing the heat sink" on page 38: 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 51. 38 ThinkCentre User Guide

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2. Open the computer cover. See “Opening the computer cover” on page 28.
3. Locate the heat sink. See “Locating components” on page 10.
4. Follow this sequence to remove the four screws that secure the heat sink to the system board:
a.
Partially remove screw
1
, then fully remove screw
2
, and then fully remove screw
1
.
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 22. Removing the heat sink
5. Carefully lift the 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.
6. Position the new heat sink on the system board so that the four screws are aligned with the holes
on the system board.
7. Follow this sequence to install the four screws to secure the new heat sink, as shown in Figure 22
“Removing the heat sink” on page 38:
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 51.
38
ThinkCentre User Guide