Quoted from Vanapult:Ran out of ideas and need this machine to work ASAP, so I've swapped in an Altek mpu and lamp driver board. No change!
1. Wiring error?
2. Under playfield short?
What else could be the issue.
OK this may or may not resolve your issue.
-Take both pinballs out of the machine. (make sure there are only TWO pinballs. 3 will NOT work....)
-Power the machine on.
-One at a time, add the pinballs back into the machine.
-Assure the first one "kicks over". The second one should stay at the bottom.
I had issues with pinballs not "transitioning" correctly, and re-sequencing made it work.