While you wait for answers, we may have found some information which could help you.
Click here for Error Recorder Displaysony minidisc deck mds303 keeps ejecting?
How can I get the AMS knob to work correctly?
sony walkman?
Sony JA20ES minidisc.....needing repair?
How can I fix my Sony JA20ES Minidisc?
Sony personal minidisc system ZS-M7?