Low Power Mode Time
If the machine is idle for a certain period of time (after the key operation is performed), the machine automatically turn off to save power.
When the machine is in the Energy Saver mode, the touch panel display turns OFF and 
lights.
lights.1.
Press 
.
.2.
Press [Preferences] → [Timer/Energy Settings] → [Low Power Mode Time].
3.
Press [
] or [
] to enter the desired time period for Low Power Mode → press [OK].
] or [] to enter the desired time period for Low Power Mode → press [OK].