I've been bringing this thing back from the dead and have resolved countless issues to get it 98% working(some light sockets and AS/ match unit still need work). Just about the time I was getting tired of patting myself on the back, this started happening.
The bonus unit's decrement coil fires as soon as the reset position switch opens even slightly.
-If I partially increment the bonus unit (not a full advance to the first position, just enough to open the "home" switch, the decrement coil fires and will lock on if I don't immediately return to reset position.
-If I do a full manual advance or activate a playfield bonus advance, it completely locks on.
-If locked on, it releases back to the reset position when I power the game off.
-I noticed a spark on the second from the bottom switch that opens in reset position. I put a card in there, and was able to advance bonus without the decrement coil firing
The bonus unit resets fine when starting a game if bonus is added while the machine is off.
I've attached a photo of the bonus unit area on the schematic, and a photo of the switches noting where a card allowed the bonus to advance.
I'm stumped.. just when I thought I was starting to wrap my head around this thing.
anyone have any ideas?