Is there any way to get more horizontal adjustment (Happ Vision Pro)?

MaximRecoil

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Is there any way to get more horizontal adjustment (Happ Vision Pro)?

I have a 19" Happ Vision Pro in a Missile Command upright, and I'd like to shift the image a little more to the right, but the pot on the remote adjustment board is already turned as far as it will go.
 
Check the chassis

Is there a small pot (looks like a small white button for a phillps head screwdriver) on the chassis main board?

I am messing with a game and I had to do this. The pot worked when the remote board was maxed out.

On mine, it was labeled on the board as well so it was not hard to find.

Hope this helps.
 
You don't by chance have the sync selector switch in the wrong position? If you do, the image will be shifted quite a bit to one side. If you wonder if this is your problem, push the white button on the chassis near the video connector...
 
You don't by chance have the sync selector switch in the wrong position? If you do, the image will be shifted quite a bit to one side. If you wonder if this is your problem, push the white button on the chassis near the video connector...

The sync selector switch was pushed in/down (negative). That's how the monitor came from the factory. When I put it in the up/out position (positive), that solved the problem. I now have plenty of adjustment room to both the left and right without maxing out the pot.

However, which position is correct for Missile Command, and why do both switch positions give a stable picture? What does that switch do exactly? I thought the polarity of the sync was determined by which pins you connected the H- and V-sync wires to on the video connector? My H- and V-sync wires are connected to the pins that are directly below R, G, B, and ground; not to the second set of H- and V-sync pins (not sure which set of pins are negative and which are positive, because they are not labeled as such). I've always assumed that if the sync polarity was wrong, you simply wouldn't get a stable picture.
 
Vision Pro's are slightly different in that regard. I'm not sure why you get a stable picture with the wrong sync, but you do.

And the two pins next to the RGB-ground are the positive sync pins. The 2 on the other 3-pin set are the negative sync pins...
 
Vision Pro's are slightly different in that regard. I'm not sure why you get a stable picture with the wrong sync, but you do.

And the two pins next to the RGB-ground are the positive sync pins. The 2 on the other 3-pin set are the negative sync pins...

So the Missile Command boardset generates positive sync then? Maybe I get the stable picture because I have the sync wires on the right pins (I just copied their posititions from the G07 when I first installed it, and it worked) and maybe the sync selector button doesn't actually change the sync, it is just supposed to be set to match the sync wires and makes things like horizontal position work correctly.

I wish the Vision Pro manual was more informative. It mentions the "sync polarization switch" but doesn't say what it does exactly.

I should probably check my other two Vision Pros to see if the sync switch position matches the sync wires. Those are in JAMMA machines which I think are all negative sync, and the preset position of that sync switch is negative; so they should be fine (plus I never had any H-position problems with them).
 
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