Lenovo ThinkCentre 0266 User Manual page 51

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. 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
b. Partially remove screw
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 20. 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 20
"Removing the heat sink" on page 37:
a. Partially tighten screw
b. Partially tighten screw
What to do next:
• To work with another piece of hardware, go to the appropriate section.
1 , then fully remove screw
3 , then fully remove screw
1 , then fully tighten screw
3 , then fully tighten screw
2 , and then fully remove screw
4 , and then fully remove screw
2 , and then fully tighten screw
4 , and then fully tighten screw
.
Chapter 5 Installing or replacing hardware
1 .
3 .
1 .
3 .
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