Hello everyone.
a new friend of mine has an old Data East simpsons pinabll machine thats experiencing an interesting issue. Heres what i know.
A few months ago, someone came out to work on the machine (it wasnt booting up) from what i can visually tell, part of the power harness was badly burnt and this guy (poorly) wired around it.
when i first was asked to look at the machine, it was randomly restarting or once n awhile would have a loud hum and not boot. I thought i had narrowed it down to the part of the harness the guy hacked up. i managed to solder up and clean up the wiring as best i could without redoing the whole harness. After that, everything seemed to be back to normal (so i thought)
Got a call about a week later.....game wont boot. scoreboard/marquee light up and it has a loud hum from what i can tell, is the speakers(which it was doing on occasion when i first took a look at the machine). Pinballs arent my expertise, but i am knowledgeable in electronics. First things come to mind, are a ground problem/ground loop, or power supply.
Anyone have any thoughts?