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6. Install the new power supply assembly into the chassis so that the screw holes
in the power supply assembly align with those in the chassis.
7. Install the four screws to secure the power supply assembly.
Note: Use only screws provided by Lenovo.
8. Reconnect the power supply assembly connectors to the system board.
9. Reconnect a power supply assembly connector to each of the drives.
10. Go to “Completing the parts replacement” on page 45.
Replacing the heat sink and fan assembly
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 heat sink and fan
assembly.
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.
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 “Locating 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. See “Locating parts on the system board” on
page 11.
28 User Guide