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Rafo

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Jan 22, 2018
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Hi all.
I recently got a Tekken3 PCB and when testing it, i got no sound, being from JAMMA or from RCA jacks.
The audio / JVS part had some of its parts corroded : as an example, this was what the JVS connnector looked like.
1692041542554.png
1692041558033.png
1692041612165.png

But it's not the issue.
The SPEAKER potentiometer was in pretty bad shape too. I unsoldered it and tried to clean it, but I can't reach the inside.
1692041804350.png
1692041814292.png

I'd like to replace it with a brrand new one, but I can't find a matching P/N anywhere. I thought A502 could help but it didn't.

Does someone here know where to get another potentiometer, or equivalent ?
A components list for this main board would help too I guess, escpecially about the rest of the audio part, as come tiny SMD resistors and capacitors don't look too well either.
 
Okay now I have a doubt : is there a pinout difference between the above A502 pot ? and a B102 one ? I can only find physical data on B102 but not pinout info, and I can find absolutely nothing on a A502 pot.

Any info about this part (or the volume connection on the System12 PCB) is welcome.
 
Okay now I have a doubt : is there a pinout difference between the above A502 pot ? and a B102 one ? I can only find physical data on B102 but not pinout info, and I can find absolutely nothing on a A502 pot.

Any info about this part (or the volume connection on the System12 PCB) is welcome.
Here is a theard ( https://www.arcade-projects.com/threads/tekken-2-namco-system-11-recap.416/#post-3595 ) about this hardware . Anyway , isnt writed nothing on silkscreen of the pcb ?

@Hammy reccomend this volume pot :happy:
 
OK I understood my mistake, I have a 102 pot instead of 502.
As I don't have the proper pot type (and when I removed the old one, it was so rusted some traces came with it. So for now I decided to use resistors GND-1K-OUT-2x2K-IN to simulate a 5K pot stuck to 20% and it does the job.

Plus the two 2.2µF capacitors were closer to 2,2nF, so I replaced all 4 caps close to the amp.
1724706388743.png

I know, it's dirty and it's not variable, but it works. Audio is set to monaural in the PCB settings of course.

Thanks all for your help, the Topic can be closed I guess (if such a feature exists).
 
OK I understood my mistake, I have a 102 pot instead of 502.
As I don't have the proper pot type (and when I removed the old one, it was so rusted some traces came with it. So for now I decided to use resistors GND-1K-OUT-2x2K-IN to simulate a 5K pot stuck to 20% and it does the job.

Plus the two 2.2µF capacitors were closer to 2,2nF, so I replaced all 4 caps close to the amp.
1724706388743.png

I know, it's dirty and it's not variable, but it works. Audio is set to monaural in the PCB settings of course.

Thanks all for your help, the Topic can be closed I guess (if such a feature exists).
MP 🐌🐌🐌🐌😋
 
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