Williams Jubilee (Williams, 1973) EM #10 place value score reel malfunction

[DaveBonds]

I am working on a '72-'73 Williams Jubilee (4 player version of 2 player Darling).

Everything seems to be working, with the exception of the upper playfield scoring side bumpers that don't do anything at all when triggered and the game will not score on any of the players' #10 place value reels.

This game has a dummy score reel for the #1 place value that is fixed at zero.

When any of the triggers on the playfield are tripped that are supposed to score a point in the #10 place value, it triggers the score wheel inside the cabinet to start and finish a cycle.

I feel like this may have something to do with the upper side bumper score triggers not working. I can't hear any relays buzzing, so I don't think any of the contacts are solid, but I haven't cleaned any of the contacts in the machine, yet.

I don't think it's the #10 place value reels, because all of the other reels on all four players work, with the exception of the #10 place value ones.

Are there any common causes for a scoring switch to trigger a score wheel cycle?

 

[DaveBonds]

After watching a few videos of this machine in working order on YouTube, I have determined that the score wheel is doing what it should be doing on each of the triggers, because it scores more than ten points on those triggers.

The exception to it working is that it is not completing the action after the score wheel (triggering the chime and completing a circuit to the scoring reel to rotate it).

I think if I trace this with a multimeter, I'm going to find a broken connection somewhere after the score wheel, before it splits off to all four scoring reels and before the chime.