Epson EMP-8300 User Manual page 48

Turning the Projector Off
If not using the projector for a long period, unplug the
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power cable from the electrical outlet.
CAUTION
Do not disconnect the power cable from the electrical outlet while the
indicator is flashing orange, otherwise operating problems may
result.
Set the [R/C] switch on the remote control to "OFF".
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TIP
If you leave the [R/C] switch on the remote control at "ON", it will
consume battery power. When not using the remote control, set the
[R/C] switch to "OFF".
Attach the lens cover.
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Attach the lens cover to the lens when not using the projector,
in order to stop the lens from getting dusty or dirty.
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Lens cover