When I insert a cassette tape and press the play button, nothing happens. I hear a noise inside, as if it's trying to turn, straining is more like what seems to be happening. After a couple of seconds, it shuts off. It's the same sound as if I was at the end of the tape and attempted to make the machine continue in that direction. It would groan a little, then stop. Only this time I'm in the middle of the tape (it's easy to turn by hand) and the tape deck just groans a little and quits trying to turn the tape.

SOURCE: Left Deck Door Stuck Shut on Cassette Deck

The cassette mechanism has a large gear that rotates to different positions for the different modes. On time around is a play - stop cycle. It is stuck in one position and won't come around to the stop spot. Need to take the cover off and help it to turn to get the cassette out. Then figure out if something is wrong preventing it from turning or if the wheel driving it is the problem. They are all a little different so this is where your mechanical apptitude comes in.
By the way, you'll figure out right away they don't intend these things to be fixed.
Hope Ya Fix It.

SOURCE: JVC KD-85 Cassette Deck Stops in Seconds in play, REW., & FF

Hineovision1

The deck will need new belts and idler drives cleaned and serviced, and perhaps some idler tyres replaced. You can get a belt kit from these guys. replacing them is not such a difficult job if you have some mechanical aptitude. Just take it slowly, and focus on getting the transport out of the unit.

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regards
robotek

SOURCE: Repair of Sansui cassette deck D-1000W and Compu Receiver Z-5000X in India.

i have the same deck with same problem..so this is the typical problem for this deck...got it from thrift shop..it was in perfect condition, working excellent but after few days of enjoying it, all of a sudden the same problem arises.... and the motor is abnormally hot..it is way too fast.
when i switch on the power the middle motor will automatically turn on at very high speed...i play around anything i can do hoping something is just stuck up but to no avail..