 Welcome to BCH Technologies. Today we're going to work on a workforce 3640. You can see the printer has no problem to start and to go into ready mode. But as soon as you print a page, this is what's going to happen. So this printer was from a company that only uses OEM apps and ink. And now I just print a random page. Let's say the nozzle check page. So nozzle is completely clogged. And also there's IR97, which is something wrong with internal hardware. This printer and also all of those printers, they all use T252 cartridges. And if you follow the internet, there are lots of problems with those printers. And you're going to see why. Actually it's pretty easy to fit. Also when a person has a problem with this printer, they normally just sell it very, very cheap. So you get a couple hundred dollar printer that people sell it for forty, fifty dollars. And here's one example from Facebook. And here's a local pickup on eBay. Most of those clocks are caused by epsom ink. Because epsom is using pigment ink in those series. And also they didn't design a strong pump for unclogging. We have some strong believers of epsom's OEM ink. So I'll stop here talking about epsom ink. What I'm just going to show you is that this print head is using epsom ink all the way. There are two tabs on the right. And there's another tab on your left. You don't need any tools. You can just use your fingernails to pull it out. This is more advanced version. So I'm not going to bore you about how to cut the power-offs so you can move the carriage. Then on the right side try to find a little hole. And that's the one that the right tab is going to attach to. So just use a screwdriver to press it in. And then lift it up. The left side is a little bit harder. Let me show you where the hole is. See that hole with a little bit of white. The white is part of the white plastic outside. And you see the white plastic. And there it is. Let me just use a long needle to show you one more time where's the hole. So I pulled the hole inside and from the outside here you can see that. The best tool to use is your long needle for the refill. But here I happen to have a really small screwdriver. Forget about it. I'm going to back to the needle. This piece can be removed easily. The purpose of it is to hide those cables. Then we remove the three screws. And then we can pull the printhead out. And then just for a stupid person like me, I'm going to write B. It means that this side of the ribbon is going to be towards the bottom. And I'm going to do it for each side of the ribbon. The bigger ribbon and the smaller ribbon. So when I put it down, I know that this side is towards the bottom of the printhead. Okay, you might spot some problem here. I'm going to show you what's wrong with it. So remember this is an original printhead, original Epson. We didn't do any cleaning. We just took it apart. So it's easier for us to see what the original problem is. And you see the problem there? Okay. So let's take a look at what's going on inside. You can see there's a leak inside the printhead. So the yellow ink flooded the circuit board. When there's no electricity connected to the printhead, and the printer is fine, by the once you start printing, that's where the problem starts. So we're going to clean the electronic board. And also we need to deal with the clogging. The clogs made by those pigment ink. The top piece is just rubber and steel. So we're just thoroughly cleaning the ultrasonic cleaner. Take a look at the chunks of pigment. They do not dissolve in water. They're just spending water. So once it's concentrated, it's really hard to get rid of it. When the top piece is cooking, let's work on the bottom piece. So we take a priming syringe that will flip the side of the silicone tip. Let me show you where to get those priming clips under the cleaning solution. It's right here under accessories. And the priming clip and syringe. And the cleaning solution is also under accessories. Anti-clogging agent. You can see the nozzle coming out very evenly. That's a good sign for the clogging. Now we're going to use ultrasonic cleaner for the printhead. Ultrasonic cleaner, they clean by creating microscopic bubbles. So when those bubbles burst like that, and that's going to create a temporary vacuum. And it's like a thousand thousands of little tiny bubbles sucking on you. So that's how I can dislodge the pigment. And so clean the printhead. The ultrasonic cleaner is safe to use. Except ultrasonic can destroy any kind of foils. So therefore the ultrasonic cleaner, you cannot use it for things like a microphone or speakers. Or there's some absent printhead that use foils to separate colors. So if you use the ultrasonic on those, that's going to destroy the printhead. Not all the ultrasonic cleaner are created equal. When you buy on the market, most likely you're going to get a 45 kHz cleaner. The one we use is a high frequency is 80 to 85 kHz. Here's an SEM for the nozzle. To be able to clean inside the nozzle tube, you need a bubble smaller than the diameter of the tube. The size of the bubble depends on the frequency. For example, you have a 45 kHz, which is popular on the market. You're going to have a 6.5 micron bubble. And the absent precision core radius is 10 microns. So you're okay, you can fit in. So the regular ones are from the market works. However, if you use 85 kHz, it will work better. Because you're making much smaller bubbles. We have some ultrasonic cleaners under accessories. But today the one we use is our new model, which is a lot cheaper than this. Our new model is specifically designed for the printhead, and it's well under $1000. So we did 10 minutes on one side, and then 10 minutes on the other side. When you pick up an ultrasonic machine, make sure you pick the one with a basket. Not only because a basket will provide extra protection of scratching, also the U-part is supposed to be suspended in the liquid. We're going to cover the printhead with this special tape. At home you can just use a surround wrap. We blow dry with compressed air. Then we just put it there like an air dryer. When you see this air is normally, there's a clear ribbon behind the printer, and your cartridge called the ribbon. When you work on your cartridge, it's very likely you'll just touch it and get it caught in a slot. Let me show you where it gets caught. See that clear belt caught right here in the slot. You can use your finger to push the ribbon out. Now it's asking for cartridges. Because we're already thoroughly cleaned the printhead, we decided to use a BCH cartridge to convert the whole system into a dye ink printer. For all the third-party cartridges, Epson will throw this air as though it's not Epson cartridge, and then do you still want to use it? Then we just say, OK, OK, OK, and that's it. OK, you can see the printer can read the ink level, no problem. So now we just go to print a couple pages. The first cleaning didn't look good, so we just do another cleaning. We did three cleanings, then we wait about an hour. We finally got the result we wanted. I hope you enjoyed this video. Use it us at www.bchtechnologies.com or locally at Greensboro, North Carolina. Thank you, cheers.