problems using composite sync with WG d9500

GaryMcT

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I have a WG d9500 monitor. I'm trying to get it to work with a plain-jane jamma harness. I'm using the jrok williams board as a test case. If I use the horizontal and vertical sync signals directly from the board into the vga connector, everything works fine. If I use composite sync from the jamma connector for horizontal sync, vertical sync, or both, it won't sync.

Any ideas?

Also, if I try to use the 10 pin connector on the chassis instead of the VGA part, it does sync at the correct rate, but the image is always black.
 
To use the 10 pin connector, is there a jumper you need to connect? Looking at the schematics of the D9500, it seems like there's a jumper block that you need to make sure is connected. It specifies which jumpers to connect, depending on the video levels. The VGA connector doesn't have a composite input, but the 10 pin connector does, and should work.

DogP
 
Looks like I have the correct stuff jumpered. There is a choice though between 68 or 150 ohm resisters in the schematic that I think you are referring to. I'm not sure which one it is at, but I would assume that I'd get some video with either. You think?
 
Yeah, in the bottom right of schematic:
http://www.wellsgardner.com/pdf/Schematics/D9500.pdf ... I think you'd want the jumper on R2/G2/B2... but I don't know for sure. It does seem that you should at least get dim video, if any jumpers are installed (but you'd probably get no video if the jumpers weren't installed). And you're running the composite sync off pin 10, right?

DogP
 
I've posted this here before, but I will do so again.

For the D9500 to sync properly, composite negative sync (as from a JAMMA board) should be connected to the negative horizontal sync pin ONLY. Do not add a jumper to the vertical....
 
I got it working for all my boards except for puyo puyo 2 by connecting composite to composite on the 10-pin. I'll have to try your suggestion of using horizontal sync instead to see if that game starts working.

Also, if anyone is searching and finds this with reguards to your 10-pin connector not getting color, don't be like an idiot like me and remove the VGA cable that ships with the monitor that connects directly to the neck board and instead plug the equivalent cable from the main board of the chassis to the neck board.
 
I got it working for all my boards except for puyo puyo 2 by connecting composite to composite on the 10-pin. I'll have to try your suggestion of using horizontal sync instead to see if that game starts working.

Also, if anyone is searching and finds this with reguards to your 10-pin connector not getting color, don't be like an idiot like me and remove the VGA cable that ships with the monitor that connects directly to the neck board and instead plug the equivalent cable from the main board of the chassis to the neck board.

BTW - my solution is for using it as a CGA/EGA monitor, not as a VGA....
 
BTW - my solution is for using it as a CGA/EGA monitor, not as a VGA....

I'm using it as CGA/EGA in a jamma cab using the 10-ping connector (PCBA) with this wiring:

Pins 1-Red, 2-Green, 3-Blue, 4-Ground, 10-Composite Sync

Works for 7 out of 8 games that I've tested so far. I don't know why Puyo Puyo 2 isn't working though, so I need to try your suggestion to see if that makes a difference.
 
If it works for all the games but that one, it's possible that one MIGHT be positive sync (probably not) or is damaged somewhere in the sync circuit. I have a board that did the same thing, and I found a scratch that broke a trace in the middle of the board in the sync circuit...
 
I got this from someone at WG today:

"Seeing that this is a digital monitor the game that you were asking about with the resolution of 320X224 is not one of the formats that is programmed into this models E-PROM. The lowest resolution for this model is 640X240 @15.75khz."

Seems odd to me since other lowres games work fine.

The board that isn't working works fine with other monitors, so I guess that board is fine.
 
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