Bally EM (Old Chicago) Dead Bumpers

klorvinborno

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Working through some issues with an EM Bally Old Chicago. I've got most everything working except ALL the bumpers. Since none of them work at all I'm guessing the issue is not at the bumpers themselves. I don't have a schematic on this so I could use some advice on where to start.

Are the bumpers on their own circuit?
Assuming I should start at the transformer/power supply, which taps and what Voltage should I be getting?

Old Chicago was 1976 so I'm guessing other Bally pins of that era should be similar. I will give points for wild guesses even if they are not correct or don't help!

Extra credit for advice on 2 targets that won't reset. Even when I manually move the solenoid they don't come up all the way however if I pull the individual targets up they will come up, lock, and go back down as they should.
 
Have you checked the fuse holders? Not sure if the pops have a dedicated fuse, but those 70s Bally fuse holders are pretty junky. For the targets, I'm guessing the lift bar is not level or unsecured at one end? Wild guesses, but I have an Old Chicago too.
 
The pop bumpers on Old Chicago are DC. Under the playfield there's a bridge rectifier and a dedicated fuse. If the fuse is good, the bridge may have gone open. Or one of the leads to the bridge has come off.
 
Damn you guys are good...

Lift bar had come off on the far end of the targets.

5 AMP fuse on the DC rectifier was blown, put in a 25 AMP and it works fine now!!!

Just kidding, fuse holder went bad and fuse must have fallen down.

Thanks for all your help, took a bit to find that bridge rectifier even with your great description, never would have found it on my own (especially since I didn't know it existed).
 
Since the last questions went so well here's a few more.

1. The ball in play lights are kinda flaky, they seem to come on when a lane is activated on the playfield and they stay on, or sometimes just stays off. Figured I would look at the ball in play relay but since it's all of them, could it be a different switch somewhere else?

2. No lights working that lead to the spinner
 
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