Lenovo ThinkCentre 7258 User Manual page 43

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.
This section provides instructions on how to replace the heat sink and fan
assembly.
To replace the heat sink and fan assembly:
1. Remove the computer cover. See "Removing the computer cover" on page 14.
2. Lay the computer on its side for easier access to the system board.
3. Locate the heat sink and fan assembly. See "Identifying parts on the system
board" on page 11.
4. Disconnect the heat sink and fan assembly cable from the microprocessor fan
connector on the system board.
5. Remove the four screws 1 that secure the heat sink and fan assembly to the
system board.
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 and fan assembly.
Figure 28. Removing the heat sink and fan assembly
6. Lift the failing heat sink and fan assembly off the system board.
Notes:
a. You might have to gently twist the heat sink and fan assembly to free it
from the microprocessor.
b. Do not touch the thermal grease while handling the heat sink and fan
assembly.
7. Position the new heat sink and fan assembly on the microprocessor so that the
four screws are aligned with the holes on the system board.
Chapter 2. Installing options and replacing hardware
35