Having a strange issue that I'm trying to fix on a Bally Black Pyramid.
Both slingshots are firing at random, but not scoring. I've checked switches (and finally just went ahead and desoldered one of them to make damn sure it wasn't closing somehow), and made sure there was not chance the coils are grounding out anything.
When they fire, they don't score. I can exacerbate the problem by rapidly firing the flippers, but it's not necessarily tied to flipper activation because it will also happen randomly when the ball is simply in play. (I'm thinking it still has to do with some sort of vibration though).
I just finished restoring it and it has new rectifier, new Alltek MPU/Solenoid Driver/Lamp Driver/Aux Lamp Driver. I swapped out the MPU with another brand new one. Still no change. I also have more Alltek Sol Driver boards I can swap out, but wanted to ask here first.
I have NOT repinned the connectors yet.
Any help on trying to diagnose this would be greatly appreciated.
Thanks,
Yopp