Wells D9400 woes..

I have one of these, not sure if I should start a new topic. It had a dark picture and horizontal width jitter, so I hit it with my tube rejuvenator and it's nice and bright now. I had a look, there wasn't too much in the way of dry joints that I could see and when I tapped the board it didn't have any relation to the horizontal issue, but went over it a bit anyway. I heated up the caps with a hot air gun and that didn't seem to make any difference, so I sprayed the horizontal width pot with some contact cleaner, it seemed to make it better but I might just be imagining it lol. has anyone seen anything like this with these?
 
Need to start another thread!

The yoke should have never been removed
A waste of time. On this thread!

When the problem was on the chassis!
And from my experience.


Your chassis
Need to have a fixed image in your thread
like a game board crosshatch pattern
which will make it easier to see more of a width jitter
not on a game screen shot, with a video of the symptom
if you can do that.

It would be much easier if you had a O-scope
for this type of symptom..

At the same time you can confirm the width fits the
full deflection, and not over-scan causing a jitter..

And can test each resolution as well for on screen display
all part of the evaluation!

Check it out
 
Need to start another thread!

The yoke should have never been removed
A waste of time. On this thread!

When the problem was on the chassis!
And from my experience.


Your chassis
Need to have a fixed image in your thread
like a game board crosshatch pattern
which will make it easier to see more of a width jitter
not on a game screen shot, with a video of the symptom
if you can do that.

It would be much easier if you had a O-scope
for this type of symptom..

At the same time you can confirm the width fits the
full deflection, and not over-scan causing a jitter..

And can test each resolution as well for on screen display
all part of the evaluation!

Check it out
Thanks for the reply, I'll get onto it
 
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