Hey, I've searched the forums a lot now and haven't found anything on this, but I have a problem on my NST machine.
The machine was NIB but it did only take a few months for this problem to show the first time:
The lock post BELOW the left ramp (where it stops the ball from the "mystery collect lane") sometimes doesn't come out and the ball isn't stopped. It just runs through. I've hd this problem and then it worked again and now it has happened again. Sometimes it starts to work again, though... It's really strange. Does somebody have oder had this problem, too?
I've looked into the playfield from below but I can't see anything unusual there. The post seems to move just fine and it doesn't get stuck on anything. You can press it down and it straight comes up. I've noticed for the games when it worked that the post comes out right after the ball rolled over it. But in the games where it didn't work the post just doesn't come up after the ball rolled over. Sometimes it goes up again. It always makes the loud sound from "going down" though. Even if it is already in the "down" position.
I hope it explained it in a way somebody can understand what's going on.
Does somebody have the problem and maybe know what to do about it?
For me it now feels like maybe a code problem or the plunger mechanism is somehow defective.