Marantz Cassette Deck Model Sd 35 Tape door will not open
It sounds like the drive belts on the deck have broken (not allowing playing, FF or REW) and/or the tape got "eaten" meaning the tape itself has wound itself around the rollers and cannot free itself. I strongly doubt this is an electrical issue. Definately sounds mechanical.
As far as the door not opening, there's usually a hook that holds the door closed. If the unit is mostly disassembled, look near one of the sides of the door for a metal hook. It's normally spring loaded and can be moved manually. That should free the door. If your tape was eaten, it might take some gentle persuasion to unwrap it from the rollers.
Good luck.
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