Great that it seems to be cured.
A couple of points that this thread has raised. One is tightening of the mounting/earthing screws. This is not only a good idea but is actually required in Zacs. I had a buyer of a Zac MPU say it had worked fine for a year but suddenly started going beserk and blowing fuses. Naturally the first thing that the finger gets pointed at is the replacement MPU
.
Turned out to be loose PCB mounting screws on the power supply PCB causing the random problems and fuse blowing.
The second point is RoHS (Removal of Hazardous Substances) or "lead free solder". Thanks primarily to Europe, practically all new electronics for the past 10 years has been made using this hideous stuff. That coincides with a drastic drop in the reliability of almost all electronics from TVs to Pinball machines.
This will get worse and quickly as RoHS solder ages poorly and seems to break up after just a few years creating dry joints that simply cannot be corrected on some of the microscopic parts used these days.
Be aware that this RoHS issue WILL affect new pinball machines probably about NOW!!!
