Units or Tens relays or Unit drive solenoids?

Is your 1 Point/N relay stuck on too? If so, it may be that the Normally Closed switch on the 1 Point score reel isn't opening to release the relay.

Corral 1s unit (resized).jpg

/Mark

I should clarify. When things seize up as you described, is the 1 Point/N relay locked on too? That could explain the 1s and 10s score reels and the 0-9 unit sticking on.

I suspect that both the 10s/M relay and the 0-9 unit are stuck on because the 1s/N relay is stuck on. That should be easy to verify. Next time things lock up, check:

- the switch on the 1s/N relay (slate-white wire to red-white wire) that leads through the 9th position of the 1s score reel to the 10s/M relay.
- the switch on the 1s/N relay (green-yellow wire to red-white wire) that leads to the 0-9 unit coil.

If you can stick a piece of paper or something similar between the contacts of those switches and have the 10s/M relay or 0-9 unit coil relax, then the 1s/N relay is the culprit.

So the question remains, why does the 1s/N relay stick on? If it's not the switch shown in reply #4 (which should open once the 1s score reel plunger pulls in), you'll have to go through the other switches that could fire the 1s/N relay. There are a bunch of them: 1 point contact switches, Motor 1D and B relay, Motor 3D and C relay, Motor 4D and A relay, and Motor switch 1C. The good news is that you can eliminate all of them (other than the one from reply #4) by verifying that the Motor Switch 1C (orange-black wire to red-white wire) opens. Stick paper in there when things lock up to see if that releases the 1pt/N relay.

Another test that might be interesting would be to stick a piece of paper into the holder switch on the N relay (slate-white-red wire to yellow-blue wire) next time things lock up. If that causes the N relay to relax, the problem is either that switch, the one from reply #4 or somewhere in between.

That switch is supposed to hold the 1pt/N relay in until the 1s score reel plunger has completed its full stroke and opens the other switch. Since you've disabled it with the paper the 1pt/N relay only pulses while a target switch is closed, barely enough time for the score reel to do its thing. I'm pretty sure your problem is in that hold circuit. My money is on the switch from reply #4. Does it operate like the switches on the other score reels?