Quoted from oilspot:Ok, after more cleaning, fiddling and adjusting I got the ball count stepper to work consistently for awhile again. Except when the left 300 point switch is tripped in the bagatelle. The right 300 point switch functions normally, but the left one fails to trigger the ball count stepper . I am baffled as these two switches are essentially the same switch. They do the same thing to the same wire. If the left switch didn't score 300 then this would be easy. I'm almost ready to just write "extra ball" on the backglass over that switch!
We think they're wired in parallel but your machine doesn't think so. There's 2 of us but unfortunately your machine has veto power! You're going to have to look carefully at the wiring in the backbox and maybe even temporarily unsolder some wires.