Quoted from DakotaMike:Hey All,
I'm helping someone with their Addams Family, and I've got a weird issue that I'm not sure how to go about diagnosing. The bookcase Opto 1 will phantom trigger when the right flipper button is pressed. This happens both in switch-test and in-game. The issue is currently intermittent, but essentially game-breaking, as a player will now get points and greed letters every time they flip during a game.
I've never encountered an issue quite like this one before, and what research I've done isn't turning up a lot. But I'm leaning toward a failing or backwards diode somewhere. Which is letting back-voltage leak through to the switch matrix, which is phantom triggering the opto.I'm going to try and follow Soren's method here, but if anyone has any ideas or knows which track I should be on, I'd appreciate the help.
If it was my game, I would start looking for a dodgy connection on the bookcase optos. You may have to reflow the solder on the opto boards or electrical connections. Check the opto electrical connections (wiring) are firm and making good contact next.
Good Luck!
Roselle, IL
