k4600 monitor horizontal centering

[clhug]

I have a Gorf game with a k4600 monitor.  Works fine except that the video on the monitor is an inch or two too high (stuff cut off at top, the scrolling text appears about 2 inches above the physical bottom of the monitor).

Of course in Gorf this is a sideways mounted monitor, so it's actually the horizontal position, not the vertical position.

I've done a bunch of searching and found the manual for the monitor, and some posts on another forum about a horizontal centering pot.  But apparently older versions of the monitor don't have the horizontal centering pot, and mine doesn't either.

So the basic question is, is there a way to adjust the horizontal centering on the older version of the monitor that does not have the centering pot?

Oh, I DO have the horizontal and vertical raster position jumpers and I did move that in the needed direction.  It only moved the picture about an eighth of an inch, not nearly enough.

Thank you.

[Ken Layton]

Coil L351 can adjust some centering:

http://homearcade.org/BBBB/slanted.html

[clhug]

Thank you for the suggestion.  I tried that but it didn't help.  If it moved at all, it was negligible enough that I couldn't even see it.  If I turn it too far it just makes the screen go totally whacky.

[Ken Layton]

Over at the KLOV forums, there is a thread detailing how to modify/update the main board to support horizontal center adjustments:

http://forums.arcade-museum.com/showthread.php?t=176509&highlight=4600+horizontal+centering

These threads will also be useful:

http://forums.arcade-museum.com/showthread.php?t=204115&highlight=4600+horizontal+centering

http://forums.arcade-museum.com/showthread.php?t=58913&highlight=4600+horizontal+centering

[clhug]

Over at the KLOV forums, there is a thread detailing how to modify/update the main board to support horizontal center adjustments:

http://forums.arcade-museum.com/showthread.php?t=176509&highlight=4600+horizontal+centering

These threads will also be useful:

http://forums.arcade-museum.com/showthread.php?t=204115&highlight=4600+horizontal+centering

http://forums.arcade-museum.com/showthread.php?t=58913&highlight=4600+horizontal+centering

Thank you again.  I had actually found the one about modifying the main board to support centering, but it seems to only matter if you have the interface card that has the pot on it, which I don't.  The other two threads seem to essentially ask the same question I'm asking with no real answer, except perhaps to replace the interface with a newer version that does have the centering pot on it (and then I'd probably have to do the mainboard  mod to support it).

I was hoping to not have to go to that point (I don't have any immediate way to get one of the newer interface boards), but I guess if that's the only option...