Need a little assistance with 20-EZ convergence, please.

supertechnoboy

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Need a little assistance with 20-EZ convergence, please.

I picked up a couple of Sanyo 20-EZY monitors (looks like they have Atari serial number stickers on them). One won't sync and the other had vertical foldover.

I just finished recapping the one with foldover, but now that I can see clearly, it has a convergence problem. The convergence is correct at the bottom, but as you move up the screen the red goes one way and the blue goes the other. The is also a significant purity issue that I assume is related.

I have not messed around with convergence very much. I jacked around with the rings a little with no improvement. Is it possible the yoke got bumped? Maybe the rings are it and I didn't try hard enough. Any assistance would be appreciated.
 

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When I tried to adjust the yoke, I found that the whole thing was loose. One of the wedges must have backed out or something. I was able to move the yoke around using leather gloves as suggested by Ken Layton in another thread, until the convergence was bad in a uniform way top to bottom. Then using the wedges, I got it to stay there.

After that, I adjusted the purity with the first set of rings. Then I adjusted the red-blue convergence with the second set of rings, then the magenta with the third set. Then I tweaked the wedges a little more, tweaked the red-blue a little more, and the magenta a little more.

I have always been scared to move those rings, but it's really not a big deal once you figure out how they work. It's worth saying that each pair should be rotated together to move one direction, or split from each other to move the other direction. Moving any one ring alone does not work very well. (I'm sure this seems totally obvious to the experienced monitor guys, but it was new for me.)

As an added bonus for the day, I was able to fix the other monitor with the sync issue using this thread. I replaced D211, D212, and TR204, and now both monitors look great! Hooray!
 

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