Video Sync Jamma on WG25k7191

itobandito

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Just had a quick question, I believe the info below is correct for a jamma connection to my WG25K7191 just wanted to make sure before I put the pins in the molex like this. Can anyone confirm??
Pin
6 - red
5 - green
4 - blue
3 - ground
2 - positive vertical sync
1 - positive horizontal sync

3 - ground
2 - negative vertical sync
1 - negative horizontal sync

Now all I have to do is hook the Red, Green, Blue to the proper place and the ground to either of the two grounds. The Sync wire should be split or jumpered to bothe the negative vert and horiz sync correct??? That last part is what I am trying to confirm.
Here is a diagram of the board, I am considering pin 6 the closet to the back of the monitor.
http://www.jstookey.com/arcade/WG_25k7191/WG_25k7191_diagram.JPG
 
Pin
6 - red
5 - green
4 - blue
3 - ground
2 - positive vertical sync
1 - positive horizontal sync

3 - ground
2 - negative vertical sync
1 - negative horizontal sync

"either of the two grounds. The Sync wire should be split or jumpered to bothe the negative vert and horiz sync correct???"

depends on what the output of the board is.

put the video ground on pin 3 near the negative vertical and horiz sync, if you are using the negative vert and horiz sync inputs.

sometimes it seems to matter where the video ground goes, other times it dont seem to matter. but start there and see what seems to dial it in the best.
 
Last edited:
You may find that hooking the sync up the way you suggest will not give a stable picture. That is because the K7xxx series chassis usually only requires the negative horizontal sync wire when using composite negative sync.

If you can't get a stable picture, try removing the negative vertical sync wire....
 
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