Lenovo ThinkCentre Edge 91z Hardware Maintenance Manual page 111

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 95.
4. Remove the VESA mount bracket. See "Removing the VESA mount bracket" on page 99.
5. Locate the power supply. See "FRU locations" on page 86.
6. Remove the system board shield. See "Removing and reinstalling the system board shield" on page 102.
7. Disconnect the power supply cables from the system board. See "System board parts and connectors"
on page 88.
8. Remove the three screws
Figure 26. Removing the three screws that secure the power supply
9. 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 100. Remove the power supply
out of the computer.
10. To reinstall the power supply, reinstall the two screws that secure the power cord connector to the
power connector bracket. See "Replacing the rear I/O assembly" on page 100
11. Position the new power supply in the computer and align the three screw holes in the new power supply
with those in the computer main bracket. Install the three screws to secure the new power supply.
12. Route the new power cord connector cable, and then reinstall the rear I/O assembly. See "Replacing
the rear I/O assembly" on page 100.
13. Connect the new power supply cables to the power supply connectors on the system board. See
"System board parts and connectors" on page 88.
14. Reinstall the system board shield. See "Removing and reinstalling the system board shield" on page 102.
15. Reinstall the VESA mount bracket. See "Removing the VESA mount bracket" on page 99.
16. Reinstall the computer cover. See "Removing the computer cover" on page 95.
17. Go to "Completing the parts replacement" on page 127.
1 that secure the power supply.
.
Chapter 8 Replacing FRUs
105