K700 P538 board screen size to small

adams_arcade

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Donor 2012, 2023
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I tried turning my vertical position on a refurbished chassis. Image shows what I have right now. Turning V size does not help screen size...what simple thing am I missing?
 

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check that the vertical size pot is not broke.
wiggle it with your fingers and look below the knob to see if there is a cracked leg as you wiggle it.

Peace
Buffett
 
should I consider taking out these pots and putting in a remote board?
 
that would be allot more work but you could do it yes.

but i do not think it will solve your problem.

what does the B+ measure on your chassis.
if it is low it will not fill the screen.

it should be 130vdc.

just a suggestion turn all the pots on the chassis so you can verify that they all work. and that the screen does not get bigger or smaller when you turn the V-Size pot. it is strange that you are only getting the smaller image.

another thing to check MAKE sure your ANODE cap is in the tube ALL the way. i have seen that affect the screen size as well if not clipped under the lip with both clips in the anode cup.

Peace
Buffett
 
you'll also need to re-adjust all the color pots on the neckboard. you have a strong blue tint in the picture. I'm thinking it's not a tube issue cause I don't see diagonal lines in the screen.

would vertical IC failure cause this, or is that an absolute either it works or you're going to just have a horizontal line? lol
 
If you install the wrong vert ic, it'll look like this. Not saying that's the problem, but check what value is there...
 
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