 Welcome to BCH Technologies. Today, we're going to talk about how to interpret the nozzle check from Canon. And this is a standard nozzle check page. What happens is you have two cartridges. One is black, that has pigment ink, or maybe you convert it to the dye ink writing. And then you have another cartridge. The cartridge has CMY. So what happens is if you print a document in the black, the printer will just use the black to print the document. However, if you print a photo, even if it's gray or some other colors, even if it's black, the printer combines those three colors. Pigment ink has been known that it's not really grayed on the printing pictures. So when you print pictures, the printer is trying to use those three colors to print a picture. So that's why you have this. So the black, the Canon doesn't really need to test the mixing. So the Canon print solely from the black. And this shows you if the black is clock or not. And then for the colors, for each color, Canon is going to print at two levels. This is 100% level. And this is, Canon will not tell me what level this is, but I'm suspect it's about 70% or 80% level. And level, I mean, is a number of dots printed in the page. So you can think of this one is the old nozzle is firing. This is some part of nozzle is firing. And I had a conversation with Canon for about an hour. And they described to me as when you have a clock, the clock might not be shown if you have old nozzle is firing. And the clock may be here when only some of the nozzles are firing. So that's why they designed two levels. And this black, they are mixed. So you can see, if you make CMY, you have a different kind of black than the real black. Those are two different, those two different things. So same as I mentioned, some as yellow. So I hope you understand now what this means. So for example, this is the one, the cartridge that I unclogged yesterday. So let's focus on the color. Those two colors are OK. And you can see at the full nozzle, which is every nozzle is firing. So you get pretty good, or get closer. You get a pretty good printout except you can see a little bit here. However, if you're not using the full nozzle, you can see there's a blank. So it means there may be some still some clock stick to the printhead. So when you do not print at the full force, you will not get the correct print. And also you can see this little bit thing here. OK. So that means the printhead sometimes clocks, sometimes not. So I just use the regular unclogging method. And this is the first cleaning. You can see it has improved a lot. So even at the half nozzle, you get a printout. So this will tell you some of them still need to be cleaned. And then actually, this page is the third page after cleaning. So everything is fine. OK. In contrast, if we have this kind of cartridge, you can see it just upset. So when at the full nozzle, you got nothing coming out. And then when you have a partial, and then you got a perfect print. So this is the problem that I think, OK, I have a theory. I brought to Canon, but they won't verify. And all they tell me is you can go buy a new cartridge. So basically, they don't want to answer it. So I suspect if you see, I have another video which will show you when the printhead is about to die. And you have this kind of super wobble. OK. So here's my theory. If you only fire a couple of nozzles, I think the printhead is fine. So it's like this. But when you fire everybody together, it's known that when the printhead is dying, it start overheating. So that's why this is not printed, but this is print fine. OK, this kind of printhead is really hard to find. And I'm really glad one of our customers is sending one for troubleshooting, so we replace it with a virgin cartridge. But this is the one that printed this. So you can see it's not a virgin, so it's not being used. So it's very likely this guy is maybe at the end of his life. And we cannot confirm this theory. One thing we can try is we're going to try all the unclogging method. See if we unclog this. And if we can unclog it, we want to see how stable it is. OK, so then the conclusion we got is not if the theory is right or wrong. If we see this kind of pattern, is it still possible to unclog this? First, we make sure everybody gather enough ink. So first one, we start with the priming clip. This is really effective if there are some air bubbles blocking the nuzzles. So we can see the color is close to black, which means all three nuzzles can output the same amount of ink. So we get a white paper towel to wipe out the excessive ink before we put it in. And you can see all three colors coming out. So the first one didn't work. Then we put it in the boiling water just in case there are some really tough clogs. So we're going to use the heating to loosen up the clogging. The boiling doesn't work. So we tried ultrasonic cleaning. And still we're trying to loosen up the clog if there is any clog. So the ultrasonic doesn't work. The steaming doesn't work. OK, now I'm going to do the vacuum. I'm going to fold the paper towel. Put some water on it, on the cartridge. And then you just do a little dab on the paper. And you should be able to see all the three colors coming out. So if you see any color on the first bar, you should keep trying. However, in this circumstance, if you see the first bar is completely missing and the second bar is perfect and what I can tell you is it's really hard to unclog. OK, I hope you enjoyed this video. Visit us at www.bchtechnologies.com or locally at Greensboro, North Carolina. Thank you and good day. Cheers.