Craig, if this has the coin validator I am thinking of, open it up and look at the path the coin travels. There should be a thin wire that is actually a switch that the coin triggers as it passes by. If you trigger this by hand, be gentle as not to fully pull it back as it will short the credit pulse out. if you play with that trigger, you should get the hang of triggering pulses to the machine that a coin has been "accepted" ... If this is a casino machine it is probably different than I described and I have no knowledge of those. --Shawn