WTB: MK 1 Sound PCB (for Rev.5 T-unit) and Marquee

WadeLanham

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The sound died on my MK1, but it passes all tests, so I'm thinking there's a problem on the sound PCB.

Anyone have a known working one for sale?

Come to think of it, I could use a mint Marquee also.

Thanks,
Wade
 

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Does anyone know if I need to worry about versions with the Sound Boards, or are they all the same? I am ready to buy a used one but don't want to buy one that won't work with my T-unit Rev 5.0 main board.

Thanks,
Wade
 
Does anyone know if I need to worry about versions with the Sound Boards, or are they all the same? I am ready to buy a used one but don't want to buy one that won't work with my T-unit Rev 5.0 main board.

Thanks,
Wade

nope you can use either one, you can even use a nba jam or total carnage or t2 board. (you'll have to swap out the program roms that's all)
 
I'm assuming you haven't moved the board or it has not been stored before last used, which would eliminate bent pins. Have you attempted anything with it first? From the rom version questions I'm assuming not, apologies if you have though.

Check the pins on P1, it could be the lighting but they look slightly grey, possible oxidation. If they are discoloured I would gently sand them down with fine sand paper or a sanding pad. Always sand gently in one direction, not back and forth which could catch on the pins depending on what your using. Check they're all straight and correctly aligned and spaced.

Remove the socketed chips gently with a flat small screw driver and check if they're discoloured. Sand down gently if required, same sanding direction to avoid catching on the chip legs. If you have any pcb cleaner, spray it into the chip sockets and work with an old tooth brush then replace the chips. Try that for starters.

This is basic stuff, you won't need any special equipment to do this and it's the first of a simple series of checks.

Keep us informed.
 
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Na, it wasn't moved, it was in the machine the whole time.

I tried the obvious things. I made sure the 12v and 5v was getting to the board. Volume knob affects the volume of some slight noise that comes across at the start of the General Sound Test, so the amp seems to be good. I removed the chips, the legs looked normal (not shiny, very slight oxidation), but I cleaned them up with a scotch pad and reinstalled them. No change. That is about the extent of my troubleshooting ability. Though after reading your other thread Jon, I wonder if a logic probe might be in my future.

I didn't try cleaning pins on the larger connectors. I'll try that, just in case.

I did buy a replacment from a member here. Hopefully it arrives soon, and hopefully it works!! :) I suppose it's possible my main board or part of the wiring/connectors is the issue. If that's the case, I'm gonna kick myself.

Thanks,
Wade
 
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