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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 at 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 75.
4. Locate the system board shield in the computer. See “Locating major FRUs and CRUs” on page 66.
5. Remove the two screws 1 that secures the system board shield, and then slide the system board
shield out of the computer.
Figure 21. 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 holes aligns with that in the computer.
7. Reinstall the two screws to secure the system board shield to the computer.
8. Go to “Completing the parts replacement” on page 108.
Replacing the rear I/O assembly
Attention: Do not open your computer or attempt any repair before reading and understanding the
“Important safety information” on page 1
This section provides instructions on how to replace the rear I/O assembly.
84 ThinkCentre E73z Hardware Maintenance Manual