While you wait for answers, we may have found some information which could help you.
Click here for Sony Disc RecorderHow can I get the AMS knob to work correctly?
How can I fix my Sony JA20ES Minidisc?
Sony JA20ES minidisc.....needing repair?
Read error C13 on Sony Minidisk player/recorder?
error 40 is all my old sony mz-r3 md recorder displays?
Sony Walkman W380i?