Kyocera ECOSYS P4040dn Operation Manual page 49

In case of not using the printer for an extended period of time
CAUTION If this printer will be left unused for an extended period (e.g. overnight), turn it off at the power
switch. If the printer will not be used for an even longer period of time (e.g. vacation), remove the power
plug from the outlet as a safety precaution.
CAUTION Remove paper from the cassettes and seal it in the paper storage bag to protect it from humidity.
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Preparation before Use