NEC XT5000 - Manual (Page 17)

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Power cable
Stopper
OFF PO WER
ON
Attaching the Power Cable Stopper
The Power cable stopper is provided with the projector so that the
cable cannot be accidentally unplugged from the AC IN.
1) Remove two screws.
These screws are used later again.
2) Plug the power cable into the AC IN and then attach the stopper.
3) Fix the stopper using the two screws.