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Main => Main Forum => Topic started by: Malakite on March 31, 2011, 01:16:02 am

Title: Help with JAMMA cabinet
Post by: Malakite on March 31, 2011, 01:16:02 am

Hey folks, new to the cabinet world and I need some help.  I have included pictures to show the issues, and to see the beauty that cost me $100  :lol

Recently purchased a Tekken 3 Jamma cabinet which turns out has a strange problem.

When you first turn the unit on the display that comes up is a flickering epileptic inducing nightmare.  It looks like 5 or 6 rapidly scrolling compressed screens.

After a couple of hours sitting on, the display starts to looke like 2 scrolling images and then finally stabalizes into a nice clear game image.

When I first saw it I assumed it was the CRT failing and took the back off, did a visual inspection of the caps and what connectors I could get to without removing the CRT and everything looked ok.

The plot thickened when I finally got to play the game and I knocked the joystick a bit hard and the screen flicked to the rapid scrolling and a small hit restored it back to working.

I opened the drawer where the PCB is and checked the connections.  Nothing unusual there.  I removed the PCB, cleaned the JAMMA connector and checked the board for any noticeable problems.  Again nothing.  When I plugged everything back in and restored power the screen came up scrolling like I had just turned it on.  Hitting the console didnt work (sounds so sad) and when I put some pressure on the JAMMA connector the display flickered but did not correct.  After a couple of hours I came back and the game was ready to play.

So I am wondering if anyone has come across this issue.  I am thinking it could be a cold solder joint in the JAMMA connector, but since there is very little heat there, why would it eventually start working?  I was thinking it could still be the CRT but I have no idea why it would work after warming up, but then not work after just powering down the unit for a minute or two?  Could the PCB be at fault?  A cold solder joint on one of the chips?

Any help would be great and much appreciated.

Thanks.

Title: Re: Help with JAMMA cabinet
Post by: notroubleclubber on March 31, 2011, 02:46:45 am

If your handy with the soldering iron then i would reflow the joints and as its so cheap do a cap kit on the monitor. Sounds like a loose connection somewhere but id put my money on it being needing a cap kit.

Title: Re: Help with JAMMA cabinet
Post by: matsadona on March 31, 2011, 04:53:27 am

To me it just looks like a bad sync signal. I assume that you have turned the Hold knobs on the chassi PCB?
Else my suggestion is to re solder all the video leads. Regardless of your experience hitting the joystick...

But of course, that is all based on my experience and I do not claim it to be the "truth" :)

Title: Re: Help with JAMMA cabinet
Post by: Malakite on April 01, 2011, 02:46:42 am

Thanks guys.  I will give it a shot.  I did try the hold knobs but no change.