Wells & Gardner 19V1001 horizontal sync small issue

[jpettit]

Hello,

I have a working WG 19V1001, on which I did a cap kit replacement.

But there is still one issue I can't fix : the horizontal sync.
Basically, it works, the picture is steady and clean. But the position of the picture is not correct :

turning the horizontal sync button (in the metal "box" under the screen) moves the picture up and down (space invaders cabinet)
If I turn too much, than I lose the sync.
Unfortunatly, I need to move the picture a bit more UP, but I lose the sync before I reach the position I want to.

Any idea what could be the problem ? Maybe a coil problem ? (even thought the picture size seems OK, it's just a position problem)

Thanks for any help 

jpettit