Resetting factory settings
Perform this procedure if the display is abnormal or if operations cannot be performed.
Various settings are reset to the factory default values. Make settings again.
Turn off the power using 
.
.Press while simultaneously pressing SOUND MODE 
and TUNER PRESET CH +.
while simultaneously pressing SOUND MODE and TUNER PRESET CH +.Release the two buttons when the display starts flashing at intervals of about 1 second.