Time for a hopper overhaul.
Empty bowl contents.
Undo the grounding wire from top of bowl.
Remove 4 screws inside springs surrounding the bowl.
Place screws and springs aside...they must go on the same way later....two are black and two are silver.
Remove hopper bowl spring from frame-to-bowl and place both aside.
Remove 2 screws/washers from the knife.
Place aside with the knife plate guide for re-install later.
There's also 2 screws for the coin face place under the knife.
Remove and place aside as well.
Remove 3 screws from center of pinwheel.
Remove rubber agitator, coin shelf wheel, and nib wheel.
Now put on cheap rubber gloves.
Clean everything out from under hopper knife and wheels, and where the plates were.
There will be black lint gunk, human hair, and paper.
Place under microscope if you don't believe me...lol
Shove hopper motor frame back into machine as is.
Gently place wires aside so they don't get caught in anything and run the hopper test again.
If the motor hums and the axle turns, assemble everything back together the way it was disassembled starting with the nib wheel, coin shelf wheel and rubber agitator.
All screws should be hand tightened firmly but not crazy tight...no need to torque any screws.
Now is a good time to thoroughly check all wires and connections for any breaks or looseness.
If the axle doesn't turn, your motor or transmission is shot or the brakes aren't releasing.
Check to see if the brakes release by pressing on the magnetic metal brake handle surrounding the motor.
It should release the brake pawl on the red nibs coming out of the back of the motor.
A small spring engages the brake pawl onto the red nibs.
If working correctly, when pressing the brake pawl against the motor, the wheel in the bowl should turn with your other hand on the rubber agitator.
Will advise more details if you get this far.
Below is an 8 yr old video I made to test by hand with a rubber band....>>>
https://www.youtube.com/watch?v=GAkVj8olMHE