What would stop one button from working on a jamma board?

ttooddddyy said:

There may be resistor arrays between the jamma inputs and the buffer/inverter ICs
Check if there is a crack causing an open circuit.

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NGT said:

While everthing is on, I touch the ground wire to the 2nd players #2 button's pin on the fingerboard on the heavy barrel board itself. NOTHING.!

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channelmaniac said:

It's a board problem, not a switch problem Topher...

I'm not familar with that board but I had a similar problem with a Pit Fighter board. It used a simple 7400 series buffer on that pin. If yours is similar then you can check the inputs and outputs of the buffer IC and replace it if it is faulty.

RJ

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NGT said:

So I am trying to help this guy with his cab and his second player #2 button isn't working. I redo all of the ground and still nothing. I check another game and bam, it works. Another game and bam, it works.

So, I put the heavy barrel board back in and everything works perfectly besides the #2 button on the 2nd player. Same as before. So, I turn it all on and wire a ground wire up so it's loose on one end. While everthing is on, I touch the ground wire to the 2nd players #2 button's pin on the fingerboard on the heavy barrel board itself. NOTHING. I touch the pin over for button one and the guy starts shooting. Back to #2 button and I get nothing.

So, what would cause a button on a game to stop working?

Broken trace on a board?

Ideas?

thanks!

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yami said:

Clean the jamma connector of the game board.

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