John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum

In the last episode of the Arcade Outsiders, there was some talk about John and Phet consolidating all the info they've come across on the various uncommon caps that may need to be replaced on a 4600 (aside from what typically comes in a cap kit).  There was some info at the end of the last Jump Bug episode that talked about what fixed the blurry screen, but I've been hoping to see something more thorough because I am having trouble with a 4600 in a Satan's Hollow that I recently capped.  Everything is working but the colors aren't real vibrant and there is a little bit of curl along the right edge of the screen that I can't seem to get rid of.

The issue john had was fixed by replacing the neckboard socket. Your issue is pretty typical of the k4600. I would try to mess around with the color biasing and the brightness to fix the color issues and try bumping the hsync a bit and see if that fixes the curl.

You might need to mess with the hidden pot.  It can fix the curl issue.  It might sound like I'm kidding, but I'm not, just can't find a picture to show you.  You need to adjust it with a small screwdriver through a hole in the mounting bracket.

On the 4600 the curl is often caused by the C621 paper cap.
.1uf, 1.5kV +or-20%. Those were paper caps which are not available anymore.
It can be replaced with something like a polypropylene / film cap.

Yeah, that curl can be a real pain.  I've spent a lot of time with the hidden pot but can never get it set perfectly.  I think I'm going to just start replacing any cap that I can that wasn't in the cap kit.

I was kind of hoping John and Phet would improve upon the old flow chart that we use for troubleshooting a 4600 so that we could actually pinpoint certain caps that cause certain issues.  That's a lot of work though.

Thanks for the advice, I'll look at that paper cap and see what I can figure out.