Hi All,

I have a 1969 Gottlieb Mini Pool machine and after replacing all of my backbox lights, there are (5) out of (13) bulbs that are not lighting up. I've tried switching out bulbs to ensure there wasn't an issue with the bulbs. I also made sure they were seated correctly. I know it's not a fuse or all of the scene lights would be out. I looked at the schematic (see photo) but don't see where I could look for the problem.

Thanks for your help!

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All other backbox lights show up including score reels, game over, balls to go, and the other set of scene lights.

Thanks! I'll try that today and report back

I checked all of the wiring for the sockets (see image) and there are no breaks or loose/broken solder. All was working fine prior to replacing the bulbs. Any ideas?

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So...dumb question. How will I know it kills the 5 bulbs if those aren't working?

---side note. I had replaced all my incandescent with LED----

Ok. So this is weird. I also noticed that the 4 "Name Lights" weren't working either. For the scene lights, I removed all 5 that weren't working as well as the one that is working. I then tested them using incandescent. When I put an incandescent bulb into any of the 5 that weren't working, the "Name Lights" came on (but not the actual bulb in that socket). When I put an LED bulb in, the "Name Lights" did not come on. I then put the LED's back in the 5 sockets and now get a very dim light, which I didn't get before. So now I'm really puzzled.

I'll try both of your suggestions and let you know. Thanks!

I tried both of your suggestions. Still nothing. It's also weird that the name lights come on when I put an incandescent bulb into ANY of the 5 that aren't working (there are 6 grouped together on that side). But if I put an LED in them, the name lights don't work.

Looking at the schematic....the "scene lights" don't trace anywhere. I'm trying to figure out what else to look at to troubleshoot.

I also checked to see if there were any disconnected wires and solder. All good there.

Any other ideas on this?

There is a socket behind the bell. I tried replacing with the old incandescent bulbs. Same issue. Regarding the alligator clips....am I just attaching one end to the working bulb and the other to the non-working bulb. Sorry, I haven't had experience using those.

Ok. And that would be on the bottom of each socket, correct?

So if the non-working bulb lights up when I connect the alligator clips, what does that tell me? Conversely, it the bulb does not light up what does that mean?

Yep. 5 out of 13 not working. There are two groupings of scene lights. All of the lights work on one of the groups (7 lights). And then 5 out of 6 do not work in the other group. I tried each of the 5 individually with different bulbs.

So I cleaned the Jones plugs and adjusted switches on the T relay. Everything works now! I'm pretty sure it was the Jones plugs that were causing the problem. Thanks to everyone for their help!