I have a problem with my Stern Nine Ball.
When I lock a ball in the left lock it drops all remaining drop targets on the left side one at a time and gives 3000 points as it is supposed to. But at random times when it is dropping the targets it will drop a target and at the same time fire the left slingshot or the outhole kicker.
It is quite random, never the same drop target , as in it doesn't always do it when say #2 drops or #5 drops. And never the same amount of targets, for instance never just after the second target drops or the third. It's always random, and sometimes it only fires the drops and not the left sling or outhole. And it always drops the targets properly.
Things that have been done or checked.
1: New Alltek Mpu was substituted, same problem.
2: New power board, same issue.
3: Re-pinned all connectors, and yes I mean all of them.
4: Tested the diode and cap on the slingshot and they are fine.
5: All switches checked multiple times in multiple ways, no switch problems at all. All gapped properly and all working properly.
6: All wiring checked and appears correct.
7: Running rom version 60
8: Pia's swapped with working ones from Meteor. Same problem.