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Figure21. Installing the system fan assembly
8. Connect the cable of the new system fan assembly to the system fan connector on the system board.
9. Reinstall the hard disk drive if you have removed it.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the replacement, go to “Completing the parts replacement” on page 84.
Replacing the microprocessor
Attention
Do not open your computer or attempt any repair before reading and understanding the “Important safety information”
in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre
Safety and Warranty Guide, go to:http://www.lenovo.com/support
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. Remove the computer cover. See “Removing the computer cover” on page 68.
2. Remove any parts and disconnect any cables that might prevent your access to the system board.
3. Locate the heat sink and remove it from the system board. See “Locating components” on page
66 and “Replacing the heat sink” on page 76.
4. Place the heat sink on its side so that the thermal grease on the bottom of the heat sink does not
get in contact with anything.
5. Lift the small handle 1 and open the retainer 3 to access the microprocessor 2 .
Chapter 8. Replacing FRUs 79