Are any of the "Drum Unit Zero Pos. Bk. Switches" opening too soon? Is the Reset Relay relaxing early?

Gold Rush reset (resized).JPG

Thanks, Howard.

Except when player 2's score reels are at 4 or lower - In that case, the reset relay must stay engaged and the score motor continues for another cycle, right?

So it's acting like it only recognizes the D.U. zero pos. bk. switches being closed for player 2. Otherwise, it acts like those switches on the other 3 players reels are already open, even if they're not at zero. Don't know what that means yet.

I wonder if you start a game so that player 1's score is not zero, and then measure the resistance across the D.U. zero pos. bk. switches - from the common Blu-Br wire to the vertical wire on the left (is it yellow?) - what do you read. I would think since some of the D.U.'s are not at zero, you would read a dead short. But do you?

Well, they should read a short because they aren't at zero. The switches should be closed unless the drum units actually read zero. If they're all wired in parallel and any of the drum units are not at zero, you should read a short across those switches.

But what's curious is that the score motor is dropping out early, presumably because the reset relay is relaxing as you said in post #5. So somehow, the reset relay is losing its connection to the yellow wire. Except when player 2 has a low score....which is weird.

That Reset Relay switch between the relay and those zero switches is working as it should? If that were the problem, though, I don't know why player 2's score would have any affect on it.

Nothing's coming to mind at the moment - maybe Howard has an idea?

I would check the blue-brown wire jones plug connection in the backbox. A weak connection could be what’s letting the reset relay drop out early.