While you wait for answers, we may have found some information which could help you.
Click here for Sony Play DiscsSony personal minidisc system ZS-M7?
Read error C13 on Sony Minidisk player/recorder?
sony je series.Stops between tracks?
Sony Walkman W380i?
How can I fix a sony walkman cd/mp3 player?
How can I get the AMS knob to work correctly?