Audio System Symptom Troubleshooting - Audio unit disc indicator does not work

Audio unit disc indicator does not work
NOTE: Discs with labels should not be used in the audio unit. They may damage the player mechanism.
  1. Turn on the audio system.
  1. Insert a known-good disc or press the EJECT button.
Is the DISC indicator (LED) indicated?
YES -
The audio unit is OK at this time. Check for loose or poor connections at audio unit and audio panel.■
NO -