No it is not a US machine. But logic of finding out the culprit should be the same I imagine.
I have reseated the cash box and the acceptor several times.
I have reseated the small board in the door, small board to the left side of the cabinet and the main boards (drawer).
I have power cycled the machine several times. I have swabed the sensors of the acceptor with a wet (water) cotton bud and then a dry. I have visually inspected the
gears and belts, all look in order.
At every power on the acceptor starts doing its "thing", but by the sound of things it cuts its initiation process short.