Please help!! Sansui SC-3100 rewind problem

[LordAragorn]

This is a Sansui SC-3100 cassette deck; new belts installed. Play, fast forward work without the solenoid triggering the deck to stop the function.

The only issue is that when rewind button is pressed (with or without a cassette in) the solenoid triggers the deck to stop. In some cassettes, the rewind works very slow.

The motor has been lubed and has good torque.

What would be the issue and how do I resolve it? tI can live with the way it is but I’d like to have a perfectly working deck. Thank you.


Link to YouTube video below:

 

[LordAragorn]

One more update. I have a donor SC-3110 as well for some parts I used in the 3100 (not any from the tape mechanism). Despite swapping the left/ right spools and the idler wheel, the 3100 exhibits the same rewind issue whereas the 3110 does not. I can’t restore the 3110 instead because it is black face and the control board is defective.

I can add videos of both the decks if the experts here want so; please advise. Thank you.