Lenovo ThinkCentre 3231 Hardware Maintenance Manual page 145

7. Slide the power supply away from the chassis and remove it from the
computer.
Figure 51. Removing the power supply
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.
v If the voltage supply range is 100–127 V AC, set the switch to 115 V.
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 158.
Chapter 9. Replacing FRUs - Desktop computers
139