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Figure 15. Removing the screws that secure the power supply assembly
4. Remove the old power supply assembly from the chassis.
5. Ensure that the power supply assembly is the correct replacement. Some power supply assemblies
automatically sense the voltage, some power supply assemblies are voltage specic, and some power
supply assemblies have a voltage-selection switch. If your computer has a voltage-selection switch,
ensure 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 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 FRU replacement” on page 97.
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.
78 ThinkCentre Hardware Maintenance Manual