I have a Bally 831-c machine. The problem is that when I put in the 1st coin, the light on the 2nd coin comes on right away. The next coin lights up the light of the 3rd coin. So I can’t play with the single coin mode at all. I went through the stepper unit and it seems to be ok. It has only three steps, should there be four steps? Or where the fault may be?
Summary: The machine works well but it can only be played in two coin mode, which can be accessed with one coin, and in three coins mode, which can be accessed with two coins? Please help me? I have schematics but it is hard to find the problem from that...