Any ideas? I'm just finishing off Magic Town add a ball version.
Its have a lot of work done to it and on its first start worked ok, sort of anyway. Meaning, I've noticed that sometimes it's not allowing all the score reels to zero, yet will still play.

I have been going through it and noticed that if the reels are all under number 5, they will go to zero when starting from game over. I have also noticed that it will sometimes, if switching on from cold, I.e switched off say on ball 3, it counts down to and returns up to ball 5, ready to begin. It will,irrespective of what score is shown, reset the reels correctly.

It seems to me that the time being used whilst the ball count is going up and down, in that time the reels are getting enough of a timed pulse to reset properly.
Looking at the schematic, the impulse cam shows 10 teeth, and its switch stack is going up and down during motion in time with the reels so to my mind, is a timing issue. Indeed, this 10 toothed cam shows the various switches that would seem to control this function yet whatever I try, it's not curing the problem.

I have looked at the reset, game over relays, and these appear ok. No doubt it's just something simple but after a good few hours, I'm no close to finding the fault!

Should the ball count unit always step up and down, or simply count to 5 from zero? If it always did the former, there would be enough time for it to reset to zero correctly.

Thoughts welcome!

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It would appear to be yes. I have noticed that when the motor runs for a longer time, the reels get a chance to zero so it's a timing issue I think. ( I've attached another closeup image of that)

And I think that where the ball counter goes down and up again is actually correct, unless it's already at game over as it then counts up to 5, as it should. The BCU was completely rebuilt anyway so I'm certain there are no issues with that.
I'll take a close look at the score reels too, hopefully, this is where the problem is.

Anyway, I'm tired out with it so tomorrow is another day.

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Thanks, Mark.

I'll take another squint at it tomorrow and see if I can see where I'm going wrong. Fresh pair of eyes and all that. I'll keep you all posted and thanks again.

Thanks, Howard.
If I cant resolve it then I'll get my schematic copied. Fortunately, it's a good one that I bought from PBR.

Fixed! Thanks to everyone who helped out. The problem was two fold. The first was, upon dismantling the reset relay, I had 2 burnt out switch contacts. I noticed some sparks when the reset was in operation so that wasn't right, obviously. ( see image) And I also re-gapped the index switch stack which made the motor run for longer so as to allow a full reset so the timing issue is now ok.
The machine will now go to zero (with the reels set to 1111 so as to give maximum travel) from game over, and the ball count follows that to give five balls
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