Lenovo ThinkCentre 3512, Manual, Page: 95 / 128

5. Remove the screw that secures the system board shield, and then slide the system board shield out
of the computer.
Figure 24. Removing the system board shield
6. To reinstall the system board shield, slide the system board shield into the system board shield slot so
that the screw hole aligns with that in the computer.
7. Reinstall the screw to secure the system board shield to the computer.
8. Go to “Completing the parts replacement” on page 111.
Replacing the power supply
Attention
Do not open your computer or attempt any repair before reading and understanding the “Important safety
information” in the
Safety , Warranty, and Setup Guide that came with your computer. To obtain a copy of
the Safety , Warranty, and Setup Guide , go to:
http://www.lenovo.com/support
This section provides instructions on how to replace the power supply.
To replace the power supply, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface. Hold the sides of your computer and
gently lay it down so that the screen is against the surface and the cover is facing up.
3. Remove the computer cover. See “Removing the computer cover” on page 81.
4. Remove the VESA mount bracket. See “Removing the VESA mount bracket” on page 85.
5. Locate the power supply. See “Locating major FRUs and CRUs” on page 68.
6. Remove the system board shield. See “Removing and reinstalling the system board shield” on page 88.
7. Disconnect the power supply cables from the system board. See “System board parts and connectors”
on page 72.
8. Remove the rear I/O assembly, and then remove the power cord connector from the power cord
connector bracket. See “Replacing the rear I/O assembly” on page 86.
Chapter 9
.
Replacing FRUs
89