Youtube vid of my Demolition Derby problem

tec9

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Hey guys-
I've been having a issue with my Demolition Derby, and have taken a Youtube video of it, hoping that someone may have a suggestion or could try this on their machine. I did put this link on my original repair thread, but I feel like it might have been missed, so I posting a new thread on it. Sorry to keep making posts on this, but I'm hoping that someone who has this game can try this out on their machine.

http://www.youtube.com/watch?v=JMynNLpnDW0

Here is the other posts I made on this:


http://forums.arcade-museum.com/showthread.php?t=186883


http://forums.arcade-museum.com/showthread.php?t=189260

-Mark
 
the only thing i can think of is try putting the wire(s) in some kind of shielding

maybe you have a spot where they have rubbed together over time and the electrical pulse/charge is affecting another wire
 
I can't find a schematic, manual, or pinout that demonstrates how the encoders are hooked up. Anyway your test convinces me that the CPU is reading the wrong port. I think your task is to determine if that's because of a faulty select line or faulty software.

I'd suggest hooking up a Fluke 9010A, setting the two wheels in the same way, then making the Fluke read one wheel continuously. See if you can reproduce the same thing as in your test where it gets the opposite port's value. At the same time check out the select lines and see if the one looks good, or if the other is getting a glitch.

I have a 9010A and I'm in the Detroit area. I'm not sure what else to recommend for a diagnosis.
 
I can't find a schematic, manual, or pinout that demonstrates how the encoders are hooked up. Anyway your test convinces me that the CPU is reading the wrong port. I think your task is to determine if that's because of a faulty select line or faulty software.

I'd suggest hooking up a Fluke 9010A, setting the two wheels in the same way, then making the Fluke read one wheel continuously. See if you can reproduce the same thing as in your test where it gets the opposite port's value. At the same time check out the select lines and see if the one looks good, or if the other is getting a glitch.

I have a 9010A and I'm in the Detroit area. I'm not sure what else to recommend for a diagnosis.

Unfortunatley I don't have access to a Fluke...and I've never used one before! I am hoping someone else who has this game, can try this test. I've swapped out everything possible on this machine and it does the same thing no matter what! Another member here says his machine does the same, but I would like to see what others machines do to.
-Mark
 
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