Power supply removal and installation - ThinkStation D20 (type 4155, 4158, 4218)
Attention: Never remove the cover on a power supply or any part that has the following label attached.
Hazardous voltage, current, and energy levels are present inside any component that has this label attached. There are no servicable parts inside these components.
Attention: Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkStation Safety and Warranty Guide that came with your computer.
This section provides information about how to move and replace the power supply.
To replace the power supply, do the following:
Remove the computer cover and then lay the computer on its side. See "Cover removal".
Disconnect the power supply cables from the system board connectors. Disconnect the power supply cables from all adapter cards (some models) and from all drives.
Remove the power supply cables from the cable clips and ties.
Remove the six power supply retaining screws at the rear of the chassis and inside the chassis.
Slide the power supply assembly toward the front of the computer and lift it out from the chassis.
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.
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.
Install and tighten the four screws at the rear of the chassis to secure the power supply.
Install and tighten the two screws that secure the power supply to the inside of the chassis.
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.