Lenovo ThinkCentre 3656 Hardware Maintenance Manual page 126

To access system board components and the drives:
1. Remove the computer cover. See "Removing the cover" on page 117.
2. Remove the front bezel by releasing the three tabs and pivoting the bezel
3. In some models, you might have to remove the PCI adapter card in order to
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forward to remove completely.
gain access to the battery.