Good afternoon folks!
I'm currently working on my k4600 series and have gotten the monitor SO CLOSE. Went from a dead monitor to almost working, struggled to get the horizontal/vertical hold to work, but figured that out! Turns out there didn't need to be a jumper on the vsync cable.
The next thing I'd like to solve is the bowed image it seems to have, and it looks like it's got a tiny bit of folding happening at the right side (the top of the vertical). Check out the pic. I don't have a TPG yet, so I'm using a raspberry pi with a jamma adapter to test it out for now.
I'm not at a loss just yet, just loving learning how these monitors work since this is my first ever time working on a crt!