WG4900 Color Bleeding

DaveHanes

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Apr 10, 2008
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Loveland, Colorado
Hi, I'm working on a Wells-Gardner 4900 for a friend's Galaga project (that machine was quite a basket case, but that's a different story). This is an older revision 4900 chassis with the older yoke to match. The monitor chassis has been re-capped, and the CRT has been checked out with a B&K 470 as being ok.

I am having 2 problems:

1) The colors in the text are "bleeding" quite badly (see picture via link below), kind of like what you would expect if the black level was set wrong, or the neck board pots (cutoff/drive) need to be adjusted. But, in this case the black level is all the way down, and so are all of the cutoff/drive pots.

http://i1273.photobucket.com/albums/y419/David_Hanes/WG4900.jpg


2) The other problem is that the image is not centered in the horizontal direction (meaning the longer dimension of the CRT), it's too far to the right (or down if you are looking at the monitor in the vertical direction). I can't adjust it up high enough unless I change the horizontal hold, but if I do that, the next time the game powers up, it loses horizontal sync.
Note that the Galaga harness connects both positive and negative sync to the monitor...


Any ideas on where I should start looking?
Thanks!
 
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