Replacing The Power Supply Assembly - Lenovo THINKCENTRE 9120 Replacement Manual

Replacing the power supply assembly

This section provides instructions on how to replace the power supply assembly.
1. Remove the computer cover. See "Removing the cover" on page 11.
2. Disconnect the power supply cables from the system board and from all drives.
3. Remove the four screws at the rear of the chassis that secure the power supply.
Figure 19. Removing the power supply screws
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
6. Install the four screws to secure the power supply assembly.
7. Reconnect all the power supply cables to the drives and the system board.
8. Go to Chapter 4, "Completing the parts replacement," on page 43.
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Hardware Installation and Replacement Guide
Attention
Do not open your computer or attempt any repair before reading the "Important safety
information" in the Safety and Warranty Guide that was included with your computer. To
obtain a copy of the Safety and Warranty Guide, go to the Support Web site at
http://www.lenovo.com/support.
Note: For this procedure, it helps to lay the computer on its side.
See "Identifying parts on the system board" on page 9.
power supply align with those in the chassis.
Note: Use only the screws provided by Lenovo.