Could the (early SS) Bally (Supersonic) solenoid driver board cause the F4 circuit on the transformer board to short?
When I plugged in the OEM board, it ended up tripping the F4 circuit, also smoking the rectifier & varistor, which I have since replaced. When I plugged in an Alltek replacement solenoid driver board, I did not seem to get any indication of a fault (the red lights flashed right at power up, but did not stay on; I presume this means that there is no fault). I was actually hoping to find a fault so that it would explain why the OEM board smoked the transformer board. At this point, I don't think I can trust that OEM board anymore - and indeed nor any of the other OEM solenoid driver boards for my other Ballys. I'd prefer to not spend another $300 right now for the 2 other Ballys that have OEM boards, but I don't want to smoke anymore boards. I just want to have the d@mn things to be plug & play.