Quoted from oldpins:Lifting the playfield you will see at the top right (closest to the shooter rod) a switch which the ball rolls over after it is ejected from the outhole into the shooting lane. Check the contacts on that switch.
I'm resurrecting this thread to thank Pinsider Oldpins. I was pulling my hair out having an issue with my Magnotron not advancing the ball count. Finding this switch issue solved the problem. I found the lever OVER the switch doing nothing but pressing down into thin air. Moving the lever back UNDER the switch made it possible for the switch to make contact as it should.
I found the rest of the issues quickly and now have a working machine. Some flipper work to do and light bulbs to swap out but she's up and running. Thanks Oldpins!!