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Replacing the power supply assembly
Attention
Do not open your computer or attempt any repair before reading and understanding the
“Important safety information” in the ThinkCentre Safety and Warranty Guide that came with
your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide,goto:
http://www.lenovo.com/support
This section provides instructions on how to replace the power supply assembly.
Although there are no moving parts in your computer after the power cord has
been disconnected, the following warnings are required for your safety and proper
Underwriters Laboratories (UL) certification.
DANGER
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 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. Remove the computer cover. See “Removing the computer cover” on page 14.
3. Disconnect the power supply assembly cables from all drives and from the
24-pin power connector and 4-pin power connector on the system board. See
“Locating parts on the system board” on page 11.
Note: You might also need to release the power supply assembly cables from
some cable clips or ties that secure the cables to the chassis.
Chapter 2. Installing or replacing hardware 23