The board is a 371/R371DRW1 ...the bill acceptor is a MEI
That'll help the POG experts answer ya I hope!
Personally I don't know what the jumpers should be on the MEI or what pins on your board the wires should go to.
I'm only guessing when I say there are 3 wires you're using on the bill acceptor?
One is for power, other is ground while the other one senses pulse inputs from the game board.
There should be a model number on the bill acceptor somewhere.
Maye we can Google search for a wiring/pinout diagram online
and get it to work the way you want.