Lenovo ThinkPad W520 4284 Hardware Maintenance Manual page 14

Lenovo thinkpad w520 4284: user 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 T520, T520i, and W520 Hardware Maintenance Manual

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