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Segal chassis how to connect to JAMMA

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trick72:

Hi,
I have a Segal chassis CRT bought seperately. I want to put it in a cabinet with a JAMMA interface. The wiring is the RGB, Video ground and Video Sync, so 5 wires.
The Segal chassis has a 6 pin connector (see image) labeled
R
G
B
H
H+V
V

How should I wire this to the jamma? RGB is obvious, but what about the sync and ground?
Thanks

princess prin prin:

It could be:

R
G
B
GND
H H+V
V

The H sync pin is usually also used for composite sync (H+V) which is the sync of jamma boards. It shouldn't be hard to check if the unlabelled pin is ground

trick72:

Thanks for your reply.
I tried it like this:
pin1 : R
pin2: G
pin3: B
pin4: video ground
pin5: video sync
pin6: empty

When I power on the cabinet, initially the video is not in sync. It seems "stable" (so not going left/right or up/down but "all garbled").
When I disconnect video ground pin4 and connect it again while the game is running, the screen goes perfectly in sync and displays fine all of a sudden!
However, when I power-off and power-on the game again, the image is again not in sync until I manually disconnect and reconnect video ground.

Anyone familiar with this behavior?
Thanks

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