Jamma test cabinet in Kansas City

heilxmq

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Anyone in the Kansas City area have a horizontal Jamma cabinet? I have a PCB that looks like it has some sprite issues but I want to check my sanity on a different cabinet.

Anyone care if I stop by to test a PCB? I will bring you beer.
 
dont put the sync wire on the ground. (or E)
and
put the black lead on the LOGIC ground (on the PCB like the negative lead of an electrolytic capacitor) and the red lead on the 5 volt ground rail on the game PCB. then you can adjust the +5 volts but dont go over 5.35 for very long or you can damage an IC chip. (5.25 max)
 
So I looked at the SF II that I have working and the Black Tiger. I noticed the monitor setup should be the same:

Horizontal Mount Raster Scan
Negative Composite Sync

I played around with swapping the V and H/C but there's no picture unless I use H/C. Here's a picture of what I'm seeing.
 

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Reading this in the Black Tiger manual. Wonder if this is what I'm running into.

Horizontal Tearing

CAUSE: The negative sync signal of most logic sets are slightly different than the GO7-CBO monitor negative sync inports. The result of this mismatch is a horizontal "wave" or "curl"
 
That's totally different... what you're seeing is a PCB issue, horizontal tearing would be referring to a monitor problem. The PCB issue could be caused by incorrect voltage, broken traces, bad chips, etc.

DogP
 
I've read through a ton of posts here. It seems this graphic issue with the main character and enemy is fairly common.

I've tested the voltage and it is right at 5. I bumped it up to 5.1 for a bit for kicks but it didn't help. I think I may leave it powered up for awhile and see if that does anything.

Someone in a previous post with the same issue said the following:

"I also have a Black tiger Board that has a graffics issue with the player and enemies. I know that one's the rom chips 1-3 but don't know where to get them."

Anyone sell the rom chip replacement for this?
 
take the back of a finger and start feeling ROMS, IC's and then i shut it off and feel the transistors...the ones with 3 legs. if one is getting real hot you might be able to glue on a heat sink or at least know which ROM might need replacing. i had a PAC JR that i fixed that way by putting a heat sink on it.

i have heat sinks if you need
 
If anyone is curious.

I bumped up the voltage a little more and it runs clean now. The picture gradually got better as I increased the voltage.
 
I have seen similiar issues on other games. Check the voltage at the PROMs to see what they are really getting. Measuring it at the edge connector isn't always the most reliable way.

Scott C.
 
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