Lenovo ThinkPad X220 4287 Hardware Maintenance Manual page 12

Lenovo thinkpad x220 4287: reference guide
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DANGER
Unless hot swap is allowed for the FRU being replaced, do as follows before removing it: power off the
computer, unplug all power cords from electrical outlets, remove the battery pack, and disconnect any
interconnecting cables.
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ThinkPad X220 and X220i Hardware Maintenance Manual

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