Lenovo ThinkCentre M800 User Manual page 74

Hazardous moving parts. Keep fingers and other body parts away.
CAUTION:
Never remove the cover on a power supply or any part that has the following label attached.
Hazardous voltage, current, and energy levels are present inside any component that has this label
attached. There are no serviceable parts inside these components. If you suspect a problem with
one of these parts, contact a service technician.
To replace the power supply assembly, do the following:
1. Remove any media from the drives and turn off all connected devices and the computer. Then,
disconnect all power cords from electrical outlets and disconnect all cables that are connected to the
computer.
2. Remove the computer cover. See "Removing the computer cover" on page 52.
3. Locate the power supply assembly. See "Computer components" on page 4.
4. Disconnect the power supply assembly cables from the system board and all drives. See "Parts on
the system board" on page 5.
5. Release the power supply assembly cables from the cable clips and ties in the chassis.
6. Lay the computer on its side and remove the four screws at the rear of the chassis that secure the
power supply assembly. Then, slide the power supply assembly to the front of the computer and lift
it out of the chassis.
Figure 31. Removing the screws that secure the power supply assembly
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 the four screws to secure the power supply assembly to the chassis.
9. Reconnect the power supply assembly cables to the system board and each of the drives.
10. Secure the power supply assembly cables with the cable clips and ties in the chassis.
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ThinkCentre M800 and M900 User Guide