Lenovo ThinkCentre M55e Hardware Maintenance Manual - Page 100
Replacing the CMOS battery, Replacing the power supply, Important, Attention
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Replacing 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. Important Refer to "Safety notices (multi-lingual translations)" on page 7 for information about replacing and disposing of the battery. 1. Remove the cover. See "Removing the cover" on page 87. 2. Locate the battery. See the system board illustration for your machine type at "Identifying parts on the system board" on page 89. 3. You might have to remove any PCI adapters that impede access to the battery. 4. Remove the old battery. 5. Install the new battery. 6. Replace any PCI adapters that were removed. 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. 7. Go to "Completing the FRU replacement" on page 124. Replacing the power supply Attention 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 servicable parts inside these components. 94 Hardware Maintenance Manual