WG K4901 - Can't get vertical position any lower

JC Arcade

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I can't seem to get the picture to the bottom of the screen. This is one of the newer versions of the chassis with the vertical raster postion pot, but when I use that to adjust it will go down about 1/2 an inch than move back up. If I turn it the other way, does the same thing. Goes down a bit then moves back up.
 

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I can't seem to get the picture to the bottom of the screen. This is one of the newer versions of the chassis with the vertical raster postion pot, but when I use that to adjust it will go down about 1/2 an inch than move back up. If I turn it the other way, does the same thing. Goes down a bit then moves back up.

Moves back up - as in folds over? Are you using it with the newer version yoke or an older version yoke? Has the chassis been capped lately?
 
No, doesn't fold over, just moves off the screen up top. Hasn't been capped lately, and I don't know which version of the yoke I have. How can I tell?
 
No, doesn't fold over, just moves off the screen up top. Hasn't been capped lately, and I don't know which version of the yoke I have. How can I tell?

Do a search for k4900 yoke differences and you'll find the numbers that you'll find on a sticker on the side of the yoke, and how they should match with the chassis.

The reason I asked about foldover is that you said the picture adjusts down a bit "and then back up". I took that to mean that as you turn the pot one direction, the picture moves down and then starts moving up even though you're still turning the knob the same direction...
 
I took that to mean that as you turn the pot one direction, the picture moves down and then starts moving up even though you're still turning the knob the same direction...

Then I'm an idiot because that's exactly what it's doing. :eek:

.
 
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