I have a problem with my minidisc player (Sharp MD-MT 15). I need to transcibe some minidiscs for a project, but I can't hear any sounds when the minidiscs are playing. I can see the time, and I can see the disc is running, but I don't hear anything! The minidiscs should contain recorded audio by another minidisc player. The minidiscs are from Fuji. Other ones, from Fuji as well, function normally. Why does my minidisc player function well with some minidiscs and doesn't reproduce any sound at all with other minidiscs, even though they're running?? I hope someone can tell me what the problem could be!! You would really help me!