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4. Remove the old power supply assembly out of the chassis.
5. 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 computer has a voltage-selection
switch, make sure that you set the voltage-selection switch of the new power supply assembly to
match the voltage available at your electrical outlet. If necessary, use a ballpoint pen to slide the
voltage-selection switch to a different 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.
6. 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 chassis.
7. Install the four screws to secure the new power supply assembly in place.
Note: Use only screws provided by Lenovo.
8. Connect the new power supply assembly cables to the system board and all drives.
9. Go to "Completing the FRU replacement" on page 84.
Replacing the system board
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 opening the computer cover.
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
Note: When replacing the system board a new retention module for the microprocessor heat sink is required.
Make sure you have a new retention module before beginning this procedure.
This section provides instructions on how to remove and replace the system board. The procedure varies
depending upon the machine type.
1. Remove the cover. See "Removing the computer cover" on page 67.
2. Place the computer on its right side to help make the system board more accessible.
3. Remove any adapter cards installed in the PCI connectors.
4. Disconnect the signal and power cables from the hard disk drive and remove the hard disk drive out of
the chassis. See "Replacing the hard disk drive" on page 79.
5. Disconnect the heat sink and fan assembly cable from the system board. And lift the heat sink and
fan assembly off the failing system board. See the system board illustration for your machine type at
"System board connectors" on page 66.
6. Carefully take note of the location of all cable connections on the system board and disconnect all cables.
See the system board illustration for your machine type at "System board connectors" on page 66.
7. Remove the screws that secure the system board to the chassis.
8. Remove the failing system board out of the chassis.
.
Chapter 8
Replacing FRUs (Type 0841)
71
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