Bad Yoke?

LyonsArcade

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How can I tell if I have a bad yoke or not?

I have a K7200 13" monitor in a game, and the screen started having serious convergence issues. It looked as if the Yoke had been pulled back 3 inches, the sides cave in like a fishbowl, and none of the colors line up. I rebuilt the chassis once, and it 'fixed' the problem, but 2 months later it started doing the same thing. I replaced the flyback, etc. again and it didn't fix it.

I finally put another board I got in, tested working, in it...... same issue! So it's got to be either the yoke, or the tube, correct? I've never had a bad yoke, so I don't know what to really check out to see what's up.

I tested the impedence, I'm getting about 3.9 for horizontal, and 15ohms for vertical. That sounds about right to me. I also checked and don't see anything 'shorting out' near the yoke, and it's in the right position pressed up near the tube with the wedges still in place.

Any ideas?
 
No unfortunately it's a 13" monitor and I just don't have much of that stuff. Plus it's an 8 pin tube and monitor board, so I don't have any way to hook it to my rejuvenator either.
 
Thanks for the offer, but I built an adaptor and tested the tube on my rejuvenator, and it tests out with no shorts. I don't know what the hell's up with it.
 
Broken shadow mask? I kinda doubt that.

Only other suggestion I have is testing each component independently of each other.
 
yoke

Sounds like the setup rings are loose.
 
Yeah, the convergence is wayyyy off, like an inch on a 13", and the sides of the screen are shrunk in, in the middle, like an hourglass.
 
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