Lenovo ThinkCentre 9349 Hardware Installation Manual page 34

Figure 19. Removing the power-supply-retaining screws
10. Go to Chapter 4, "Completing the parts replacement," on page 47.
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Hardware Installation and Replacement Guide
3. Remove the four screws at the rear of the chassis that secure the power
supply.
4. Lift the power supply out of the chassis.
5. Install the new power supply into the chassis so that the screw holes in the
power supply align with those in the chassis.
6. Install the four screws to secure the power supply.
Note: Use only the screws provided by Lenovo.
7. Reconnect the power supply connectors to the system board.
8. Reconnect a power supply connector to each of the drives.
9. If your computer has a voltage-selection switch, ensure 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 switch to a different position.
v If the voltage supply range in your local country or region is 100–127 V ac,
set the switch to 115 V.
v If the voltage supply range is in your local country or region is 200–240 V
ac, set the switch to 230 V.