How does the focus pot work?

scottz29

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What's happening in the focus circuit that sharpens or blurs the picture?

Reason I ask is that I'm wondering if it's possible to have one gun out of focus. I have a WG k7203 whose Red gun is much more dim and blurry than Green and Blue. Done a capkit and can't seem to adjust. Yes, I've tried all the brightness/contrast/drive/cutoff adjustments. This is another problem outside of the adjustment pots.

Also can't seem to adjust the picture physically high enough. I'm at the maximum range of the vertical adjustment pot, and can't go any further.

Overall, this monitor seems like a real piece of crap. I want to save it because it's in pristine condition, and no burn on the tube.

Suggestions on how to fix these things are appreciated.
 
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You probably have a weak red gun and need to rejuvenate the tube. When the emission is low for a particular color it can be blurry on one color.
 
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