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Replacing the CMOS battery
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 procedure describes how to remove and replace the CMOS battery.
If the CMOS battery fails, the date, time, and configuration information (including
passwords) are lost. An error message is displayed when you turn on the
computer.
1. Turn off the computer and all attached devices.
2. Unplug the power cord and remove the cover. See “Removing the computer
cover” on page 86.
3. Locate the battery. See “Identifying parts on the system board” on page 85.
4. If necessary, remove any adapters that impede access to the battery. See
“Replacing a PCI adapter card” on page 92 for more information.
5. Remove the old battery.
6. Install the new battery.
7. Replace any adapters that were removed to gain access to the battery. See
“Replacing a PCI adapter card” on page 92 for instructions for replacing
adapters.
8. Replace the cover, and plug in the power cord. See “Completing the FRU
replacement” on page 107.
Note: When the computer is turned on for the first time after battery
replacement, an error message might be displayed. This is normal after
replacing the battery.
94 Lenovo E200 Hardware Maintenance Manual