Thought I had the game working and put it into the lineup, but now it's resetting during gameplay. I can start a one-player game and put a ball into play. At some point the game will reset, doesn't seem to be consistent at all as to why but does consistently reset. Thought i might be advancing the bonus at one point, but don't think so now. Sometimes when it resets the flippers don't work and the ball drains, then a fresh ball is kicked out to the shooter lane and flippers begin to work again. Sometimes it resets and if the ball is in-play the flippers keep working. Sometimes after a reset the game adds another player. What seems a little odd is that while the Ball In-Play lite will stay at "1" the game may actually be counting the numbers of balls played correctly and after the 5th ball drains go to "Game Over". Haven't proven that one yet.

Where the heck to start on this one? Help .....

Ok, will try and go over those things this weekend and report back. Thanks

Well, looked things over and nothing seemed to be wrong with the switches or relays as far as I could tell. Tried to track it down with the playfield up and I noticed that it didn't have the problem of resetting or adding players mid-game when the coin door was open ..... what the heck. The game was wired before I got it for free play. Looked over the coin door switches and noticed that the right-side coin switch seemed to be closed and the left-side one wasn't. Tapped the switch a few times and it would definitely make the issue show up. Opened the right-side switch and closed the door. Thus far things seem to be working again now.

Wondering how that switch was causing the issue at this point. Looks to me that the switch was not exactly closed but very very close. When the door was closed something caused the circuit to close during gameplay but only intermittently, maybe a vibration or series of events? Weird that with the door open the problem wouldn't occur. The one things that seemed to make it happen most often was when I continually engaged the switches on the middle left for the "M", "A", "R" & "S". Wouldn't do it all the time but if I engaged them a number of times maybe a bonus was being set that caused "something". I have no clue at this point.

Will play some more games and see if it is solved. Just wish I could use this as another learning moment but can't quite grasp it yet.

Thanks, David

Thanks Rolf, let me look at this, I also have the schematics for Mars Trek.