Anytime there is more than a 2 ball multi-ball (tri-ball, chaos, etc) it seems like the machine loses track of a ball. Eventually it will get to a point where you are playing with one ball but it still is in multi-ball mode. When that drains you have to wait for a ball search and then eventually it will shoot out another and you continue on. Obviously it is missing some signal but I tested and at least the lasts few trough switches work fine. I will test them all, but I figured if those were bad the game would report that as a missing ball? I am hoping this is a commonality amongst games when this happens and I can look at some diode or something.

Any tips on getting the t-rex to reliably pick up and swallow the ball? Sometimes it missing the ball entirely, sometimes it takes it but doesn't swallow. I set the game level to 6.5 deg per the manual. I haven't done anything to the t-rex since I've owned the game and usually have it turned off. Are there wear parts that should be replaced or serviced?

Thanks billsfanmd and shacklersrevenge I'll do as you suggest, guess it could be as simple as I thought!

Ok, I checked all the switches and no issues. Tried every combination and they all show up fine on the diag. Any next steps?

Awesome, thanks guys. Sounds like I need to focus on the trough, I will do that test with the apron off. I don't think it's anywhere else but the trough because they are accounted for when it kicks out another. So basically you'll be still there with no balls on the playfield but the game thinks you still have one out so it's stalled. Once it does the coil check it kicks another ball out and launches it and you keep playing. So sounds like we're all on the right track.

Not sure if older threads are bumped if I reply, but I wanted to follow up here. I tested all the trough switches and they are fine and register properly. I think it might be an issue with the "ball out" switch that knows there is a ball ready to kick out to the shooter. Is that the last trough switch then? I am thinking this because what happens is that the tri-ball ends with the last ball draining but the game knows there should be another ball in play and once it does the solenoid test it kicks out and shoots out the last ball that is waiting. Is that still the trough switches?

I am unsure if I should just replace all of the switches? Because they test fine, so unsure where to go next.

ChadH YES! Thank you!! My searching wasn't accurate enough, now I know. Can't wait to fix.