Power issue or cabling issue? Gottlieb System 3

TheDrewster

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On my Title Fight, I have an auxiliary sound board attached to the main sound board. I am having intermittent problems that seem to change the most when I power cycle the machine, so I cant tell if I am having a power issue or an issue with the aux board/the ribbon cable attaching it. I will get one of these scenarios upon booting/playing:

Scenario A) Boots with no startup chime, missing lots of sounds but still has speech, most playfield effects, and the bass drum for the background music. Sound test produces loud distorted notes that arent in any order. I get this same scenario if I boot the machine without the aux board attached.

Scenario B) Boots with a single loud distorted "CHAAAAAACHHHHH", and has all the sounds of scenario A above, plus more instruments (snare drum, synthesized notes) in the background music. Sound test still distorted.

And rarely, scenario C) Boots with a normal two-tone chime and all the sounds/music are complete and stable. Sound test plays note scale correctly in and order.

Like I said above, I dont know what I should be looking at first. I have to boot the machine several times to get to scenario C but when I get it to work correctly, it always stays stable and not even moving the cabling effects the sound. However, moving the cabling while the machine is off sometimes changes things up a little.

I cant decide if I have a power issue and if I do, where are the test points? Though if I have a bad ribbon cable I can fix that easily, but its silly expensive for this tiny cable so I want to make sure thats the issue before I drop the dough on it.

Where would you start?
 
You should just send it to me and that will fix all of your problems....

Clay would be able to better answer this or the pinrepair got sys 3 guide if you could get it, but I'm thinking a board issue.
 
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could be a board issue, but before that Id check the solder joints on the sound & aux boards and replace the cable to be on the safe side
 
Also: You can get the ribbon cable connectors and make your own cable...Just make sure the wires are the same size as the original *resistance issues otherwise*.

Also I agree check the solder joints on the pins where the cable plugs and all other pins on those 2 boards first.
 
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