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6. Make sure that the new power supply assembly is the correct replacement. Some power supply
assemblies automatically sense the voltage, some power supply assemblies are voltage specific, and
some power supply assemblies have a voltage-selection switch. If your power supply assembly has
a voltage-selection switch, make sure that you set the voltage-selection switch to match the voltage
available at your electrical outlet. If necessary, use a ballpoint pen to slide the voltage-selection switch
to the correct position.
• If the voltage supply range in your local country or region is 100–127 V ac, set the voltage-selection
switch to 115 V.
• If the voltage supply range in your local country or region is 200–240 V ac, set the voltage-selection
switch to 230 V.
7. Install the new power supply assembly into the chassis so that the screw holes in the new power supply
assembly are aligned with the corresponding holes in the rear of the chassis.
8. Install the four screws to secure the new power supply assembly in place.
Note: Use only screws provided by Lenovo.
9. Connect the new power supply assembly cables to all drives and the system board. See "Locating
parts on the system board" on page 71.
10. To complete the replacement, go to "Completing the parts replacement" on page 96.
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, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See "Removing the computer cover" on page 73.
3. Lay the computer on its side for easier access to the system board.
4. Locate the heat sink and fan assembly. See "Locating components" on page 70.
5. Disconnect any cables that might prevent your access to the heat sink and fan assembly.
6. 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 71.
7. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the
system board:
a. Partially remove screw
b. Partially remove screw
1
, then fully remove screw
3
, then fully remove screw
.
Chapter 8
Replacing FRUs (Machine Types: 0806, 0810, 0821, 0823, 0827, 0829,0832, 0835,
2
, and then fully remove screw
4
, and then fully remove screw
0842, 0844, 0846, 0848, 0851, and 4089.)
1
.
3
.
83
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