INSPECTION PROCEDURE 27: CD player, CD auto changer: Sound quality is poor: Diagnosis

Check to see that the CD can be played normally and that it is free of any scratches or soiling. 

Replace with better sound quality CD.

Q: Is the sound quality better replacing the CD with a clean CD without any scratches that can be played? 

YES:  The CD is defective. The sound quality should return to normal.

NO:  Replace the audio. The sound quality should return to normal.