Canon MF247dw User Manual page 85

<Menu> <Timer Settings>
machine automatically enters sleep mode
Exiting Sleep Mode
Press . You can also tap the display or press any key other than
If an external telephone is connected, the machine exits sleep mode when you take the receiver off the
hook.
Basic Operations
<Auto Sleep Time> Set the amount of time that elapses before the
<Apply>
77
to exit sleep mode.