Build Your Own Arcade Controls Forum
Main => Main Forum => Topic started by: Flip_Willie on August 31, 2006, 04:57:57 pm
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Hello,
I have a question about the J-Pac. I recently purchased it, and want some information before I use it. In Andy Warne's faq on the J-Pac he says the following:
"Ensure that if the cabinet has an electronic coin door, this sends a 5 volt signal, not a 12 volt,
otherwise the J-PAC will be damaged."
On my Jamma Connector, I have one wire going from Component Side 6 to my coin mechanism. On Andy's site, he labels "6" as a 12 volt. So even if I have the old arcade power supply off and unplugged from my jamma connector, can this still do damage to my J-Pac? I believe this wire might supply the power for an actual electronic counter, which I wouldn't mind losing if I had to.
I suppose what I actually want to know is, is it actually possible to harm my J-pac electronically if the old arcade power supply is not plugged in at all?
Just curious.
Thanks.
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The connections on the J-PAC which are marked as 12 volt, -5 volt etc on the JAMMA pinout are not connected to anything on the J-PAC. This means that if you plug in a JAMMA connector with the power supply still working, there would be no problem BUT:
If the power supply is still working and you accidentally plug the JAMMA connector in backwards, the J-PAC will be damaged. Also some older JAMMA powre supplies dont like having no loading (ie no game board) and will overheat.
The coin signal issue is a different one. Some coin doors send a 12 volt signal which will blow the input on the J-PAC. Most coin doors send an "open collector" signal which is effectively open circuit until the coin is inserted then drops momentarily to ground. These are fine.
Some poorly-wired cabinets drive a coin counter directly from the coin signal vis 12 volts. These will damage the J-PAC.
drop me an email if you need more info andy@ultimarc.com