Quoted from treborlicec:
Got an issue on mine that is the last thing on the list since I finally got the METEOR drop bank working as intended. The last issue is that my right slingshot is firing on its own and scoring even though I have placed paper between the switch contacts. It was doing it and I figured must be getting a switch closure on a vibration, but after digging into it and doing the paper test, it isn't that. It will fire on its own when other things are firing. Either flipper can cause it, drop banks, pop bumper, but not consistently. I recall reading that bally/stern games could have issues like this due to interference. Could this be what's going on? I can try shielding the wiring.
Thanks for any info.
If the sling is awarding points then there must be switch closure somewhere. Most likely a vibration issue or the switch stacks are creating a short. Did you try tapping on the PF near the sling shot? If it has a capacitor, clip it as they are not really needed for sling shots.
The following may be your issue or not but it's interesting as many Bally Stern games do this:
Search "phantom sling shot fire" in the above search box. 3 threads should come up about this.
My F2K does the same thing, upper left sling fires whenever it wants to. I never took notice if it scores or not. It's not set up for play at this time. Keep in mind that I completely restored this game top to bottom and the phantom firing started after the restore. I haven't tried to fix this yet, but I think it may be EMF that is firing the sling. Maybe the newer manufacturing of the caps and diodes are inferior from the days of old? Who knows! I'm thinking of changing the caps from ceramic to tantelum (spelling?) or mylar. Perhaps they are better insulated?