Nakamichi BX-100 2 Head 3 motor Stereo Cassette Deck. Finest decks on earth! Solid,simple every bias  selection switch available for when it was made- even a timer switch... Cam drive instead of spring buttons- but somethingis jammed in it. Not sure what, I had a professional. Service technician spend time on it, he said something seems jammed like someonehit the solenoid buttons. too quickly. Might be an easy fix, don't know.  PLEASE note--.And shipped in its original box..thanku. offers