Hi,
I found an Alpha S9000 hopper, and it works on my S6000.
I started by testing the S6000 hopper control board on the S9000 hopper, and the board works, and the tokens are dispensed.
I ran a lot of tests and finally concluded that the problem was with the motor.
I put all the parts (except the motor) from the S6000 hopper on the S9000 hopper, and it works.
If I do the opposite, it doesn't work.
I disassembled the motor and the gearbox. No problem. I cleaned the brushes and applied electrical contact cleaner, but I still have the same symptoms as in my videos.