Quoted from PoppyCock:ok, thanks, so he probably just needs to tweak that switch. some of the switches have the contacts way to close almost touching so any vibration can allow them to make contact.
Yeah, especially that beer mug mechanism. In the regular game, that switch doesn't really do much, so if it's registering way too often you can't really tell. And the WMS software probably writes it off as faulty before long and then it doesn't do anything -- which again, doesn't really matter in the original game.
He's probably on the right track with checking what zucot said -- the metal bit that kicks the beer mug may be interfering with the free movement of the actual stand up target, effectively holding it closed.
@eggbert52, in case we haven't been clear enough yet, underneath the metal lever that makes the beer mug jump is an actual stand up target. If it's working properly, when you hit the metal lever, the beer mug should jump and the metal bit should hit the target and then it should all re-set. Make sure none of that is binding up and that the target switch isn't adjusted badly so that it's essentially always closed.