I have a 1978ish Black Jack.
It's been working, then starting blowing the under-the-playfield 1amp fuse when the game starts up.
I have checked all the other fuses are intact, and all the voltages are correct on the test points on the rectifier and on the test points on the solenoid board...
You can interact with the ChatGPT Bot in any Chat Room and there is a dedicated room. The command is /ai followed by a space and then your ? or inquiry.
ie: /ai What is a EM Pinball Machine?