For those who can understand french or just can translate french text, jonathanpotato has repaired and comment a lot of portable and deck units, even made a repair guide : Articles / Accès par thèmes / Minidisc, http://www.jonathandupre.fr/ . Note that there are dozens of comments even hundreds for some of them on each unit on Sony Insider. Non Sony units like Sharp's however are not that much analysed and commented so that could be a welcome add. I don't know if your topic will have a good success and I just cross my fingers for you. Perhaps I will had my own comments when I will have more time.