Hello All! I’m having an issue with my Gottlieb Royal Guard. It is not switching to game over after Ball 5. I have read several similar posts on here, and I have a fair amount of experience troubleshooting and restoring these machines, but still can’t nail this one down. I had it playing for about 2 days with Game Over circuit working properly, after checking/cleaning various likely suspects but never settled on a reason why it started working, and why it stopped! The score motor was replaced by someone before me, they seem to have done a good job, however, My other major issue/curiosity, is that if I add a credit to coin slot 2, it subtracts a credit and runs start up!??? I don’t own this diagram, or I’d likely have tracked this out already. Any help is appreciated, I am neither a novice or an expert, but this is one of those annoying ones! Thanks

Thanks so much Mark! That should help. I’d really appreciate it if you could show me the circuit on the “O/Match” relay as well? This problem has got to be related to one or the other, unless it’s a bad solder point/connection somewhere. All serious issues on this machine have been cold solder points either barely touching (solder plug in terminal hole) or hanging just off connection point.

Got it! Thanks again! It was a “single contact” at score motor that looked closed but was not. I had been misunderstanding the card for score motor control, looking at wrong switch bank! Duh. Lesson learned…again…found a bunch of other small fixes/adjustments so worth it. Still having odd coin slot 2 issue(s), which do not affect playability so don’t much concern me at this time; think I need to buy the whole diagram to track that one.

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Thanks! It’s came out ok for my first attempt, unfortunately I should have read more on here first! Never use Rustoleum Paints!…At least for this.