Gang:
I picked up a recent project which will cause my GFI receptacle to trip even when the machine is powered off. It usually trips within 30 minutes of the machine being plugged in - again, even when the machine is off.
Machine in question is a Bally Mata Hari.
When the issue was noted, I started by replacing the power cord and varsitor. I also replaced the rectifier board. The machine runs without issues. MPU gives me all 7 flashes, all solenoids fire, etc. The ground run seems to be intact across all contact points.
I thought that replacing the power train (which was a mess) would resolve the issue, but it hasn't.
There has never been any other occasion prior to the machine being plugged into the circuit that it would trip. If I leave the machine unplugged, the GFI never trips.
I'm stumped - your insight is appreciated!