I had a similar thing on top card. I cleaned and lubricated the mechanism on the outhole and cleaned and adjusted the score motor switch to make sure there was the maximum duration of a “throw” for the ejector. If you think you have low voltage, I’d check stuff like the slam switches and tilt relay, game over, anything that playfield power goes through.

Dave

You’ve got 2 different problems.

Check out the ball count unit as pointed tscottn. It is involved in ending the game by going to the “6th” ball when the ball hits the outhole switch on ball 5. That timing is what’s going to kill the power to O and everything downstream. Check the state of the 6th position switch when the game is done.

For the ball count not incrementing problem, I’d focus on the score motor switches 1C, 2B, and 4C. These may not be gapped properly, causing incorrect timing.

The sequence is:

1. Ball goes in the hole and closes the ball return switch
2. The O relay energizes, starting the score motor
3. The ball return fires through the 4C switch, near the end of the score motor rotation
4. The score motor switch at 2B opens, causing the O relay to drop out.
5. The ball passes over the trough switch, relying on the score motor being in the zero position, with 1C and 2B closed, and switches on S, A, E, normally closed.

Hope this helps,

Dave

I have to wonder if your O relay is sticking. I’ve been reading about “relay bias” on here and have seen it in YouTube tutorials. The idea is that the moving switch blades need to put tension on the relay to open it (help the spring). The coil had plenty of strength to close it but when it releases, you’re relying on the spring on the back and the blades themselves to get it open in a short time. Id look into that. I suppose you could have a magnetized armature. I have not run into that yet.

I can take some pictures of the score motor switches on our king pin if necessary.

Keep at it.

Dave