I have an interesting problem on a Bally Rocket III machine. The machine was extracted from an open garage where it sat for probably 20 years. It was mouse infested and was a bear to clean up. After more hours than I can count, I have most everything working, however, I have an issue with the #1 & #3 pop bumpers.
Whenever #1 or #3 pop bumpers fire, the machine will "tilt". It doesn't happen every time, but occurs often enough to where you cannot play the game. (Sometimes the bumpers will work fine for 3, 4, or even 5 hits. On hit #6, it tilts. Other times it will tilt on the first hit.) I have cleaned, adjusted and checked all switches on both pop bumpers and on the 1 & 3 pop bumper relay. I've also looked for solder drippings and loose washers, screws. Oddly enough, according to the schematics, pop bumper #2 & #4 tie into some of the same circuitry, but the machine does not tilt when #2 or # 4 fire. I have a fuzzy set of schematics, but I am still new enough to repairs that I occasionally get lost when I tracing out circuit paths. Any help the forum can provide is appreciated!
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