The all in one requires a power source from the small transformer, I’d have to look back at my documentation. 14v maybe? It was an odd voltage. The mpu/cpu Lisy1 will also work

Edit ahh found it

“ Note that the all-in-one Pascal PI-1/X4 board requires a transformer with working 11VAC and 14VAC voltages--it cannot be used in combination with a switching power supply”

Do you have the manual and schematics?

Ah here is a better break down of power

http://www.pinrepair.com/sys1/#power

As I posted above, if you want the pascal board, which I love and have used, it will not work unless you have the original transformers. If you want to run with your own power supplies, you'll need to source those voltages, 11ac and 14ac for pascal, or use replacements that do not require niwumpf and LISY1. I know the guy who created LISY1 is working on an all in one board but I do not know an ETA. However he also has sys1 led displays along with a couple other people (wolffpactec, etc) if you want a diy solution. Otherwise bostonpinball's are the ones of choice.

People have said this is possible, but no one has documented this process in detail. I had a joker poker I was going to do this with but had some life events and sold my projects. If you could source the bigger transformer used, you'll be most the way there.

very good question. And I would agree if the proper things are not tested/checked a blown fuse etc can make a transformer "seem" toast

http://www.pinrepair.com/sys1/#power

Again following this link, it will guide you through testing. You can get your DMM out and start at the wall plug, then the cable that enters the game. I would say though, testing the transformer legs, be VERY careful as you could bridge or jump the ears in correctly and blow things up.