This problem might be related to a "gateway" score motor switch that sends power to the 10, 100, 1000 point relay coils. Do you have the schematic for the machine? I know on late 70s multi-player Gottlieb machines, the score motor switch would be 1C. If you have the schematic, check to see what score motor switch is included in the 10, 100, 1000 point relay coil circuits.

Look at the NC switch in the bottom right. That is the likely culprit. What is the issue exactly?

NC switches are generally more problematic than NO, at least in my experience.

Potential Causes
1. Dirty - most likely
2. Poorly gapped, not making solid contact. Not wiping on apply. - pretty likely as well
3. Motor stopping in the wrong spot. - Bad "home" switch adjustment. Bad and/or missing brake switch. A very possible issue as well.
4. S & L switch location messed up. It happens, probably not the issue though.
5. Loose wire, cold solder joint. Possible as well.

Stick your nose in there with a strong light and see what you see.

Yes, check score motor switch 1C with the blue/black wire. Clean the switch and make sure it's adjusted properly. This switch would be normally closed (NC) when the game is started, on ball 1 with the ball in the shooter lane...

i had a similar issue, scoring stops. i believe it was 1c as well. in my case the score motor wouldnt complete the full 120 degree rotation. id touch the contact and it would complete. the pad was loose in the finger and the final fix was to replace the contact.

Yes, that is my video. A guy on RGP was asking about it a few years ago, and I happened to be in the middle of a Jacks Open restoration, so I shot it.

You experienced the downside of doing that. This technique is Pinball Restoration 530. Not Pinball Restoration 101. There are a ton of switches and if you don't get them all right...you will be out troubleshooting. And you usually miss one or two. But..if you didn't do it, you would likely have one or two that need to be hunted down anyway.

On the plus side, you end up with a game that looks almost new, inside and out. My goal was to make it look like a HOU game that sat for 30 years in somebodies basement. I usually come close to that. You can't make them look new, and if you do manage that, it can look a bit odd.

Also, you proactively find a lot of issues. If you never take the stepper apart, you'll never find out that the coil stop is broken, etc. So when I go through a game, I go through it pretty good.

Make no mistake about it, relays in the ultrasonic, sanding the bottom board etc., is all about making it look good. There are a couple of camps on the Dremel. I love it, but some people....not so much.

Here is the video

Anyway, post a picture of your INSIDE work. I love a game all cleaned up in the inside.

I will strip and sand a bottom board but... I draw the line at ultrasonic cleaning all the relays. Life is too short.

....for dirty relays.

Looks GREAT!!