I have a mini disc sharp md - ms702. i have not played it much in the past few years. now when i play a disc it plays then an disc error appears. it like it can't read the disc. if i listen to the unit you can hear it skiping like when you go to the next song. if i give it a firm tap on the side then it will play for an undertimined time and then another disc error. i have bought and used a cleaner disc. please help.

Unfortunately you've done all that you can. The unit is broken and parts are unavailable, even if they were, portable MD players were always fiddly and labour intensive to repair.

It's not all bad news though: as they're obsolete technology there are millions of perfectly good ones lying around unused and unwanted. Every single bit of minidisc equipment which I own has come from my local FreeCycle and Freegle groups, either as a response to an offer or via a request (but note that all such groups usually insist that you must make an offer before you can post a request, but there's no restriction on replying to offers already made).