Hello,
this is my first post
I have an issue with a Bally Old Chicago that I am restoring. This is my first endeavour.
The Pinball does proceed with the reset OK. My issue is with the 10-point relay that gets stuck on when hitting any of the 10-pt targets.
When doing so, the relay stays ON and I hear a buzzing sound. The score wheel does not register the point.
This happens on any of the 4 players.
I don't have this issue with the 100pt or 1000pt targets.

I have ruled out any PF switch being stuck since the resets completes OK.
I am kind of ruling out the score reels switches since it happens on all 4 players reels. Also the 10 pt reel does goes back to 0 during reset if I manually change it. But then again, I think the 2 reset relays are used for this and not the points relays.

There may have been an issue with the 10 pt relay before. I don't know. The thing I noticed when doing the check-up is that one of the wire going to the 10 pt relay was disconnected. Maybe the previous owner disconnected it. I did solder it back fine.

My research has taken me to verify the EOS switch but I am not figuring out where to look for that. All I find is related to the EOS for the flippers.

I know that something is keeping the relay energized so the score wheel can register the points and energize the chime and all. Then when the sequence is complete it is suppose to de-energize the relay.
So my questions are what is keeping the relay energized? Why is the relay not activating the 10-pt score wheel? Where is that EOS switch I should be checking?
Is the 10-90 unit from the back box involved in this?

Thanks for your help.

Thank you HowardR and MarkG.

Since I don't have alligator clips, I have tried what I could easily do. I do have a multimeter though.
I tried the paper test on the relay suggested by MarkG.
As seen on the picture, I put a paper between the contacts of the first switch on the left. When I do this, the relay does not become stuck when I hit a 10-pt target. That is a good thing I guess. However it does not activate the score wheel.
I did check the EOS switch on all 10 point wheels to see if they were not stuck. They open when I manually advance the score. Did a minor filing of the contacts with 400grit sandpaper. They seem OK.

So now I am guessing that the part that is not working is what is suppose to make the score wheel turn and open that EOS switch to notify the relay to let go.

On the 10-pt relay there are 6 switches (2 in front and 4 in the back) that I am assuming will cause an action. So one of those actions is not working.
I also noticed that one of the chimes is disconnected. There are 3 chimes (metal plates) in the front of the bottom cabinet of the pinball near the right side. One of those metal chimes bar has been removed and the plunger/knocker has been disconnected. My thinking was that was done to reduce the noise the pinball was causing when scoring points. Would that be an issue?

Thanks,

10pt-relay (resized).png