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Keys not registering on JPAC - please help!

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slapaham:
Right... well disconnected from the loom and with a pass-through keyboard, it works. So I'm assuming it's loom side then... ???

I guess that at least means that the JPac is healthy. It's just a bit of a mare as I can't see anything clearly up with the loom that would be causing any problems. :P

BobA:
As pinballjim said there have been some weird problems with an ipac that was very close to HV power lines.  Andy had a fix involving capacitors.   Those ipacs would give key presses without any switch being attached.   Your problem sounds more solid so can you check your loom by disconnecting the one key that shows up when you press it at the jamma connector? Then with the wire disconnected try your jpac in the connector again.

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