Hi, I have a 1977 Grand Prix that works awesome except occasionally the right side bonus kickout will not eject the ball. I have to shut the machine off, and turn it back on to reset. I have checked the clearances of the contacts directly below the ball socket and all is well. It doesn't fail every time, so its hard to diagnose. Any suggestions?
thanks!
1) Use a bulb tester to find out whether the Eject relay activates when this happens.
2) If the Eject relay isn't activating when this happens, check this 0 position connection on the Right Bonus stepper unit's disk and wiper.
Bulb tester
https://pinside.com/pinball/forum/topic/reading-gottlieb-schematics#post-2634425
https://pinside.com/pinball/forum/topic/em-pinball-circuits-basics-to-not-so-basic/page/2#post-3184715
https://pinside.com/pinball/forum/topic/make-yourself-a-bulb-tester
pasted_image (resized).pngFollowing... Mine does the exact same thing on the same side (R). 75% of the time it works great but sometimes it just has a random delay before it will kick the ball out. I usually don't have to resort to shutting the machine off, I will nudge it and hit the flippers but nothing consistently triggers the kickout. It seems a random... I haven't gotten around to troubleshooting it yet, I'll be interested to see what you find.
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Cedar Rapids, IA