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8. Install the new power supply into the chassis so that the screw holes in the power supply align with
those in the chassis.
Note: Use only the screws provided by Lenovo.
9. Install and tighten the four screws at the rear of the chassis to secure the power supply.
10. Check the position of the voltage-selection switch on the rear of the computer. Use a ballpoint pen to
slide the switch, if necessary.
Note: Some computers do not have a voltage-selection switch. These computers automatically control
the voltage.
• If the voltage supply range is 100–127 V AC, set the switch to 115 V.
• If the voltage supply range is 200–240 V AC, set the switch to 230 V.
11. Reconnect all the power supply cables to the drives and the system board.
12. Go to “Completing the FRU replacement” on page 131.
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 ve minutes to let the computer cool before opening the computer cover.
To replace the heat sink and fan assembly:
1. Open the computer cover. See “Opening the computer cover” on page 107.
2. Pivot the drive bay assembly upward to gain access to the heat sink and fan assembly. See “Accessing
the system board components and drives” on page 108.
3. Disconnect the heat sink and fan assembly cable from the system board. See “Locating parts on the
system board” on page 110.
4. Remove the heat sink and fan assembly from the system board by pivoting the lever 1 securing the
heat sink and fan assembly until it is fully in the up position. Carefully lift the heat sink and fan assembly
off the system board.
Note: It helps to remove the hard disk drive before this step. See “Replacing the hard disk drive” on
page 122.
Chapter 9. Replacing FRUs (Machine Types: 3379, 4083, 4088, 4099, 4138, 5897, 6137, 6234, 6258, 6303, 7174, 7220,
7346, 7354, 7357, 7360, 7483, 7582, 7627, 7630, 7638, 8910, and 9964.) 117