I'm now knee deep into my first rebuild as a total noob and I have discovered an issue where flipper buttons are adding 10 points to the player score. Not each and every button push, but probably a solid 80 percent of them. It registers the points on the power to flipper and not when the flipper coils return on release of the button. My first line of investigation will the selenoid diodes. On that note, is there a ref. voltage that I should expect while checking them on the test bench but remaining in circuit?
I will step through that testing while waiting for some insight.
One other thought, I just replaced all of the bumper rubber and I thinking that maybe one of the sling shot bumper switches might be less sloppy now and making contact due to vibration of the flipper action?
thanks in advance for any and all thoughts and input!