Lenovo 4215, 4220, 4222, 4219, 4221 manual Replacing the power supply assembly, 24User Guide

Replacing the power supply assembly

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. To obtain a copy of the ThinkStation Safety and Warranty Guide, go to: http://www.lenovo.com/support

This section provides instructions on how to replace the power supply assembly.

To replace the power supply assembly, do the following:

1.Remove the computer cover. See “Removing the computer cover” on page 14.

2.Disconnect the power supply assembly cables from the system board and all drives. See “Locating parts on the system board” on page 11.

3.Release the power supply assembly cables from the cable clips and ties in the chassis.

4.Lay the computer on its side and remove the four screws at the rear of the chassis that secure the power supply assembly.

Figure 18. Removing the screws for the power supply assembly

5.Slide the power supply assembly to the front of the computer and then lift it out of the chassis.

6.Ensure that the new power supply assembly is the correct replacement.

7.Install the new power supply assembly into the chassis so that the screw holes in the power supply assembly align with those in the chassis.

8.Install and tighten the four screws to secure the power supply assembly. Note: Use only screws provided by Lenovo.

9.Reconnect the power supply assembly cables to the system board and each of the drives.

24User Guide