48 in 1 Sync issues

[modessitt]

Show me a picture of the video input wiring as you have it hooked up to the 4900....

 

[KenLayton]

What is happening when you adjust the horizontal and vertical hold controls on the monitor?

 

[cadillacman]

hey just for giggles, ohm test that dip switch and make sure it as actually working...

 

[Scucci]

Show me a picture of the video input wiring as you have it hooked up to the 4900....

Oh... God... you're going to make me drag that out of Tron again? lol... Okay... lemme get myself motivated.

What is happening when you adjust the horizontal and vertical hold controls on the monitor?

Roll changes from WILD to the point where I can see the games menu, but still has a slight roll to it. And if you sneeze, or a mouse farts in the next room, it starts to roll again. VERY touchy.

hey just for giggles, ohm test that dip switch and make sure it as actually working..

I just did a diode check with it off... beeped at first, then stopped. So as best I can figure, it's running into something in a chip somewhere, so I did resistance on it. When off, 10.15Kohm, when on 0.1ohm (had to say ohm since the board won't let me put omega). As best I can tell, there's something going on in a chip somewhere or pretty much anywhere else in the circuit that's giving me the 10Kohm. I've tried following the traces... but I REALLY can't see that well... tiny little suckers that weave in and out of the different sides of the board.

 

[Scucci]

How it's hooked up... for easy of testing, I never do anything this ghetto for the permanent stuff.

I've tried it several different ways, but with no change. I'll try them all again if you think it would help.

 

[Scucci]

And here's a video of it running. I couldn't get around to the front of the machine to catch it in time, but you can get it to where it's still a split image, and not centered... but not rolling "down". After a second it starts rolling and just keeps speeding up.

 

[KenLayton]

The white sync wire from your harness should be going to the brown wire of the monitor.

 

[Scucci]

Yeah, tried that when I was tinkering around back there... no change. And oddly enough, no change WITHOUT the sync from the adapter plugged in at all... looks the exact same either way. No change with sync to white, sync to brown or sync to both at the same time, and no sync at all. ... so... yeah, that's not good.

Is there any information in the sync other just a steady freq? Sounds dumb... but could I use the sync from another board to steady the monitor... I guess is what I'm asking?

EDIT: The first time I was testing the wires I was behind the monitor and couldn't see what was going on. The way I have it setup now I can lean over and watch the monitor while I switch the wire around... so the fact that there is no change is news to me too... granted it did look about the same when I tried it the first time... but I couldn't tell that there was 0 change because of the monitor rolling. Now I can clearly see how heavily f***ed I am.

 

[modessitt]

Double check your JAMMA connector and do a continuity check to make sure you have good continuity from the video connector sync wire to the sync pad on the PCB. And make sure you switched the Dip Switch back to CGA...

 

[brotherhay]

You have tried positive syncing? You gotta move the brown and white wires over into the harness next to it. So the order for that harness will be R,G,Blue,Black,Brown,W

 

[modessitt]

the 48-in-1 is a negative sync board...