There is no audio output through the Optical or Coaxial Digital Audio Outputs. What could be wrong?
First, make sure that the DVD 48 was connected correctly to a compatible receiver or processor, and that the correct input on the receiver was selected. If the HDMI™ Output is in use, the Coaxial and Optical Digital Audio Outputs are muted. To use the HDMI Output for video and one of the other digital audio outputs for audio, change the HDMI Audio setting in the HDMI Setup Menu to Off.