Extremely stupid grounding question (JPAC).

[chairhome]

Hi everyone,
I've finally gotten around to hooking my MAME cabinet back up after doing some moving around and trying to clean up the cab's insides... I had a question on grounding.  Do I need to hook a ground wire to the GND terminal on the JPAC or does that provide a ground for me to use on my switches.  I know its a dumb question :-/

Just trying to figure out why I can't get my controls to work right now, running winipac and it doesn't show any controls working.  I know I had a similar problem last year where I had a ground problem with my IPAC, but it was fixed... and now I can't remember what I did.  Thanks for the help, sorry if this is in the wrong section... I haven't posted in over a year!

[swamprat96]

If I understand the question correctly- all the switches/joysticks etc need to return to the JPAC via a common ground wire. So if its an existing cabinet I would expect a common ground wire to your hardware would terminate at the Jpac

Thats if I understand correctly

[chairhome]

Okay, thanks!

I currently have all Grounds on the switches terminating at the Jamma connector.  I'll patch it into the Ground terminal on the JPAC as well.  Thanks.

[swamprat96]

OK I may be wrong. You are correct in that the ground is carried through the Jamma connection - but it still would not hurt to jump it and see if it fixes the issue. I was thinking Ipac not Jpac

[chairhome]

Well, my main question is: Do I need to ground the Ground terminal on the JPAC, or does it supply a ground connection for me to ground the other switches?  I'll try again today.

[BobA]

From the Ultimarc site

Check grounding of the cabinet before proceeding to avoid any danger/damage. The best method of doing this is as follows:

Using an ohmmeter or continuity tester check for a good connection between the following points:

Monitor frame

JAMMA edge connector ground pins. These are the 4 pins at either end of the connector.

Mains power cord ground.

Control panel ground.



Power supply ground if fitted.

[chairhome]

I read that, but I read it as saying that those points on the cabinet need to be grounded...

[CheffoJeffo]

If you are grounding your controls to the grounds on the JAMMA connector, you are fine.

[chairhome]

Thanks, so does that mean I have a different problem with my jpac controls not working?

[CheffoJeffo]

Do you get any lights on your JPac ? Can we see a picture of your wiring ?

[chairhome]

I get lights on my Jpac.  It works fine as the interface between the Arcade monitor and PC.  I guess my next step will be to connect the JPAC ground terminal to a ground and see if that gets the controls working in test mode.  Thanks for the help efforts, I'll post up pics of what I got later if I can't get it working.

[chairhome]

Never mind, got it working!  Thanks for everyone who was trying to help!

[Eny-]

Never mind, got it working!  Thanks for everyone who was trying to help!

How did you do it? I'm having the same problem. Thanks!