Replacing The Power Supply Assembly - Lenovo M91p 4480 User Manual

1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See "Removing the computer cover" on page 32.
3. Locate the battery. See "Locating parts on the system board" on page 12.
4. Remove the old battery.
Figure 28. Removing the old battery
5. Install a new battery.
Figure 29. Installing a new battery
6. Reinstall the computer cover and connect the cables. See "Completing the parts replacement" on
page 66.
Note: When the computer is turned on for the first time after replacing the battery, an error message
might be displayed. This is normal after replacing the battery.
7. Turn on the computer and all attached devices.
8. Use the Setup Utility program to set the date, time, and any passwords. See Chapter 7 "Using the Setup
Utility program" on page 77.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to "Completing the parts replacement" on page 66.

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, go to:
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.
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ThinkCentre User Guide