I own an Aiwa NSX-SZ315 Hi-Fi stereo with some problems. The first problem I want to fix is that the tape cassette drive doesn't work at all. I own an audio cassette that I can play on another stereo, but if I try to put into the Aiwa stereo and I try to play it, the drive starts to run but stops immediately; if I try to rewind or fast-forward the cassette, then it's the same. The stereo has got two cassette drives, but the behaviour is the same on each one.
What kind of problem could it be? How can I fix this?