Follow this procedure to set the auto clear time on this unit.
Solution
Setting Auto Clear Time
If the machine remains idle for a certain period of time, the display returns to the standby mode (Auto Clear function).
Press <Additional Functions>.
Press <> or <> to select [TIMER SETTINGS], then press <OK>.
Press <> or <> to select [AUTO CLEAR TIME], then press <OK>.
Press <> or <> to select [ON], then press <OK>.
Press <> or <> to select the desired interval, then press <OK>. You can set the interval from 1 to 9 minutes (in one-minute increments). You can also enter values using numeric keys.