Oki C542 User Manual page 51

After a while, the machine automatically turns off, and the power switch LED lamp goes
out.
What You Should Do If You Do Not Use This Machine for an Extended
Period of Time
If you do not use this machine for an extended period of time due to holidays, trips, or other
reasons, unplug the power cord from the outlet.
This machine does not have functional failures if the power cord is unplugged for an extended period of time (four
weeks or more).
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3. Basic Operations