So the transistor that corresponds to the drop ramp on my JackBot keeps shorting. Bought the game and it was shorted, had it replaced worked great for many many games. All the sudden ramp didn't drop again, sure enough fuse blown and Q48 shorted a TIP102.
Brand new coil what could be causing this? And they would it work well for quite some time then fail again? If there was a short I would expect it to just blow again pretty quickly .