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b. When handling the heat sink and fan assembly, do not touch the thermal grease on the bottom
of the heat sink and fan assembly.
8. Place the new heat sink and fan assembly on the system board so that the four screws are aligned with
the corresponding holes in the system board.
Note: Position the new heat sink and fan assembly so that the heat sink and fan assembly cable is
toward the microprocessor fan connector on the system board.
9. Follow the following sequence to install the four screws to secure the new heat sink and fan 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 .
10. Connect the new heat sink and fan assembly cable to the microprocessor fan connector on the system
board. See “Locating parts on the system board” on page 13.
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 63.
Replacing the microprocessor
Attention:
Do not open your computer or attempt any repair before reading and understanding the “Important safety information”
on page v.
This section provides instructions on how to replace the microprocessor.
CAUTION:
The heat sink and microprocessor might be very hot. Turn off the computer and wait three to ve
minutes to let the computer cool before removing the computer cover.
To replace the microprocessor, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 34.
3. Lay the computer on its side for easier access to the system board.
4. Remove the heat sink and fan assembly. See “Replacing the heat sink and fan assembly” on page 48.
Note: Place the heat sink and fan assembly on its side so that the thermal grease on the bottom of it
does not get in contact with anything.
50 ThinkCentre User Guide