Does the Toei CM-A20 have a horizontal position adjustment/jumper?

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Does the Toei CM-A20 have a horizontal position adjustment/jumper?

I'm trying to connect a JAMMA board and the image is off-shifted one direction quite a bit. I've found a vertical centering adjustment, but nothing for horizontal. There are a few epoxied pots with no labeling and nothing in the manual but their values...
 
Tried 3 different JAMMA boards, all with the same result. Put a non-JAMMA on with an adapter and it centers perfectly. Did a search and found many others having similar issues with JAMMA boards, but not regular boards.

So - there is some compatability issue with the newer JAMMA sync signals or something. Looks like I need to swap this monitor with the 4600 in my Gyruss or the G07 in my Q*Bert. Pity, since it has a beautiful picture and NO burn-in at all...
 
There are two black wires directly behind the V-HOLD pot, and a red and a white wire directly behind the V-SIZE pot. These wires go back to a position in the right rear of the chassis. When I pull on these cables (towards the pots), the entire image moves about an inch-and-a-half more towards center. When I release, it goes back. Even with it moved, it doesn't get close to center. Still have several inches of black on one side and off the screen on the other...
 
There is a silver rectangular box in the rear center with an adjustment pot on top. I mistakenly thought that this was the horizontal width adjustment. Nope. Adjusting moves the entire image horizontally - quite a bit, too.

Of course, i didn't find this out until I'd swapped the entire monitor out and was putting it back into my own game. Oh well, at least I have a burn free tube in there now...
 
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