 Hey everybody, welcome back to RetroTech. Today I am in the middle of restoring a Sony PVM This is a 14M4U and I've got a lot more videos coming about that restoration But today I want to specifically talk about a convergence tool that I just received in the mail and that is this Klein convergence testing tool. This convergence tool is a lens and it will separate colors on your screen So you can individually see the red, green, and blue color pattern that's projecting onto your screen So here is the CRT convergence lens made by Klein Tools. This lens should separate the red, green, and blue colors on a single white beam that goes across my CRT display screen There are some dials on the side of this lens that help me gauge how far each color is off in perspective to the center color, which is green. The lens itself doesn't actually do anything But if I place the lens up against a white beam of color on my screen You'll notice that inside the lens it breaks it down into blue, green, and then red. Blue being on the left, green being in the middle, and red being on the right And then I can use those dials on the side to adjust the two side settings and see how far each color is off So the first thing you want to do is upload a cross-hatch pattern or something with a constant white beam across the screen because a white line indicates that all three colors are going at the same time and then you just hold your lens up and you look through it and It'll show you where each individual line is lined up in coordination with each other All right, so if you look on the screen right now, you'll see what I mean how those colors are lined up With each other you could see the red the green and the blue and this lens Will again show you those colors separated out And you can tell if one is higher than the other or if two are higher than the other and then you can make Adjustments in the back of your monitor and let's go around right now, and I'll show you where you make those adjustments We're looking at the back of the PVM now and first things first as we need to talk about safety Please make sure you're not going to attempt this repair unless you're comfortable with working behind a CRT this should not be one of the first adjustments you try to make I've made plenty of videos about CRT safety Please make sure you watch those and are familiar with how the CRT is working before you get back here and try to make This type of adjustment because this type of adjustment does need to be made while your CRT is running So the first thing I want you to notice is that I have a lot more Clear area and around the yoke on both sides What I've done is I've removed the power board and set it on its side So it's still hooked up and it's still safe and while it's being used right now but it's just out of the way so that I have a full range of Motion that I can make on either side of this yoke to make an adjustment Here's a look at our convergence rings. So these rings will adjust our Color beams in almost a vertical fashion And that's the way we want to line them up because you can easily adjust them horizontally with a potentiometer That's usually on the back of the flyback or this one happens to be on the back of the actual neckboard So these there's three sets of rings. There's two sets each and each set Controlls a different part of the electron beam The two closest to the neck board. So the first two sets are going to control the green beam and As you move them you have to move those Slides apart and together and then also rotate them along the neck And that will affect that green beam and how it's cast along the screen whether it's up or down a little bit So that's one thing you have to adjust is those two will adjust the green Then behind it is another set of rings and those rings adjust the red and blue So you can use those again spread them apart push them together Unfortunately, this is just more of touch and feel and then you go on the front of the screen and you use your lens to see How your improvements are going as you make the adjustment? So again the middle section those two rings adjust your blue and your red and then the last two is for purity So that's pretty much all there is to this adjustment Again, you just have to turn those four rings and watch as it makes the adjustment on your screen now I definitely don't recommend doing this if You don't have this lens tool because it's very difficult to differentiate between those color lines with your naked eye But this lens will help you greatly Adjust the beams and see what's happening on your screen as you adjust it now before you adjust it I always recommend that you go in and take a little sharpie and mark where your rings are currently that way if you need to Reset and go back to center you can do that now I was able to pick up this tool on eBay for about $65 shipped there are still a couple more listed on there But I'm imagining that they'll start going quicker So if you want to get one and you work on a lot of CRTs Make sure you go ahead and buy one before they get harder to get so once you have your ring set like I do on this monitor Just go back and apply a little bit of either Epoxy or some type of high-temperature silicone that can hold those rings in place So you don't have to worry about making another adjustment. I'm Steve. Thanks again for watching and have a great day I'll see you next time with some more retro content