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8. Alternate tightening each screw a small and equal amount until the heat sink
9. Connect the new heat sink and fan assembly cable to the microprocessor fan
Replacing the microprocessor
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 five minutes to let the computer cool before removing the
computer cover.
To replace the microprocessor, do the following:
26
User Guide
and fan assembly is secured to the system board. Do not over-tighten the
screws.
connector on the system board.
What to do next:
v To work with another piece of hardware, go to the appropriate section.
v To complete the replacement, go to "Completing the parts replacement" on
page 35.
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
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. Note the part and connector locations on the system board. See "Locating
parts on the system board" on page 10. Then, remove any parts and
disconnect any cables that might prevent your access to the heat sink and fan
assembly.
4. Remove the heat sink and fan assembly. See "Replacing the heat sink and fan
assembly" on page 24.
5. 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.
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