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nam9

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Hi.
I have an issue with a Sega Jamma JVS I/O. This one:

800px-Sega-io-838-13683-93-pcb.jpg

I am using it in conjunction with a TTX.
Problem is that P1 Button 2&3 are shorting. Each individual press on each gives simultaneous input on both.
I have checked continuity at the jamma edge (none), and followed each input trace through to the microcontroller (also good).
I have tested with two different joysticks and with JP1 in both A&B positions. No change.

Is it screwed? Is the microcontroller replaceable?
Anything else I should check?

Thanks in advance...
 

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Happy
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I had the same problem last week but it was coming from the amp connectors, have you checked everything on this side ?
 

nam9

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...which are the amp connectors and what was the issue on yours?

Are they the surface mount PC2-24 in the above pic?
 

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those which connect from the panel to the io board.

EDIT : OK You have a jamma type io board, so not the same case
 
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