The 'Optical auto power on/off' function is designed to automatically:
Power on your system when an optical signal is recived
Power off your system if no optical signal is received within 1 minute.
You can disable this function by pressing the 'Auto Power' button found on your remote control.
The other power saving feature APD (Auto Power Down) can not be disabled.
This function powers down the device after 20 minutes if it is not used and not connected to an external device.