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Figure 9. Removing the retaining screws for the power supply
4. Remove the old power supply from the chassis.
5. Ensure that the power supply is the correct replacement. Some power supply automatically sense the
voltage, some power supply are voltage specic, and some power supply 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 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 switch to 115 V.
• If the voltage supply range in your local country or region is 200–240 V AC, set the switch to 230 V.
6. Install the new power supply into the chassis so that the screw holes in the power supply align with
those in the chassis.
7. Install the four screws to secure the power supply.
Note: Use only screws provided by Lenovo.
8. Reconnect the power supply connectors to the system board.
9. Reconnect a power supply connector to each of the drives.
10. Go to “Completing the FRU replacement” on page 103.
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.
80 ThinkCentre Hardware Maintenance Manual