Have you tried using it, recently? Sometimes, the contact switches for the play, rwd, fwd need to be cleaned as they will corrode depending on environment and lack of use.
It's a 2-head deck, but it's well-built. It isn't meant to record on Type IV tapes, as the next model up - the M-95 - was metal tape compatible. If you keep your costs below $200, it's worth putting money into.
I, recently, bought an M-95 for $350 Cdn..
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Nando.