Are you sure that motor even has the "stop" circuitry? I've seen many vintage tape decks that had motor just wired straight to power supply (or via some motor controller chip, often on separate PCB), without any ability to disconnect it while unit is on. I don't see V-35 manual available online, but on elektrotanya there's V-9000 from similar era and there the motor is just connected straight to 10V rail.