Small intro about me. Maybe not the correct place to do so, but I'm a newbie. Retired telecom analyst from central U.S.
Dabble in repairing vintage audio and tube amp equipment, but this is my first experience trying to fix a pinball machine.
I am trying to help a friend fix his Williams Jokerz system 11B (now Rottendog MPU installed).
Things I have done and fixed so far: Replaced all the caps on the power supply and the two big ones on the Aux. board.
Checked all the voltages. All seem to be very close except the 25 volt (closer to 38 volts, seems odd?)
was blowing left flipper fuse. I found a shorted diode on that coil and replaced. That fixed the problem, That flipper worked
once and now the system will turn on, but the game will not reset and run. All lamps seem to work, including display. PIA
led flashed continuously, but I believe that is normal.
What I think is next is running the three button diagnostics, but it is confusing to me what buttons to push, navigate and test.
Maybe someone has a better diagram on that then the manual, maybe a video.
Also, what is attract mode?
I will be gone for a couple days and may not reply during that time
Many thanks, TommyL