Lenovo ThinkStation D20 - Manual (Page 30)

6. Remove the six power supply retaining screws at the rear of the chassis and inside the chassis.
Figure 23. Removing the power supply retaining screws
7. Slide the power supply assembly toward the front of the computer and lift it out from the chassis.
8. Ensure that the new power supply is the correct replacement. Some power supplies automatically
sense the voltage, some power supplies are voltage specific, and some power supplies have a
voltage-selection switch. If there is a voltage-selection switch, use a ballpoint pen to slide the switch, if
necessary.
Note: For models that have a voltage-selection switch:
• If the voltage supply range is 100–127 V AC, set the switch to 115 V.
• If the voltage supply range is 200–240 V AC, set the switch to 230 V.
9. 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.
10. Install and tighten the four screws at the rear of the chassis to secure the power supply.
11. Install and tighten the two screws that secure the power supply to the inside of the chassis.
12. Reconnect all power supply cables to the drives, adapter cards, and the system board. Make sure to
reconnect the power cable to the graphics cards that require an additional cable.
13. Go to Chapter 4 “Completing the parts replacement” on page 45.
24 ThinkStation Hardware Installation and Replacement Guide