Lenovo ThinkCentre M90z User Manual page 54

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, 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 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 14.
4. Disconnect the power supply cable from the system board. See "System board part and connector
locations" on page 12.
5. Remove the hard disk drive. See "Replacing the hard disk drive" on page 23.
6. Remove the rear I/O assembly cover. See "Removing or reinstalling the rear I/O assembly cover"
on page 17.
7. Remove the four screws
secure the power cord connector bracket. Note the routing of the power cord connector cable
the power supply up to remove it from the computer main bracket.
Figure 37. Removing the power supply
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ThinkCentre User Guide
1 that secure the power supply and then remove the two screws 2 that
3
. Lift