K4600 question for the monitor gurus

rdudding

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Here's a good question for the monitor gurus.

I recapped and reflowed a K4600 for a buddy to use in his Kickman. It worked great except for the image being too low on the screen. We tried adjusting everything, but couldn't move the image high enough.
I pulled my stash of rebuilt K4600 daughter boards out and we kept swapping them until we found one that put the image high enough.

What causes this? There isn't a whole lot of components on that daughter board? Are there some of the resistors that go out of spec and need to be replaced?
 
Thanks, but we tried that and we tried moving the centering jumper too. Neither helped.
We swapped in several of my interface daughter boards until we found one that centered the image.

I had done all the recommended repair tricks on them in the past and they all worked, but they would all put the image in a slightly different place…until we found the one that put it in the right place. I'm trying to figure out what the difference was between them so that I can fix the ones that I still have.
 
didn't one of the signal board revisions add a H. Center adjustment? (not the XY)
 
 
lol at least I'm not crazy, there is a revision with H. Center

I didn't know those were a thing until I had to fix a K4600 in 2023 (it's not last year anymore!)
 
Thanks again, Ken Layton, for so thoroughly sharing your deeeeep knowledge.
 
Yeah, this may have helped…

yes, one of my earliest K4600 experiences was double image. L351 is like the big picture H. Hold adjustment, the H. Hold pot is just a portion of the range of it. you can break L351 if you're not careful, and as far as I know nobody has generated a replacement yet.

Kickman is awesome, best of luck in your mission
 
L351 will also shift the image H-position to a degree

Ditto, was my thoughts , but could not remember the part number,
went found service manual to confirm, yes L351 is a small metal can , typically has red ferrite core , ( note very brittle )
use plastic TV adjusting screw driver .
 
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