Canon E4570 External Ink Tank Printhead Life: Why Black and Color Cartridges Wear Out at Different Page Counts

Question:

I have a Canon E4570 that has been modified with an external ink tank mounted on the side of the printer. I usually get about 1,200 pages from the black printhead before it has to be changed, while the color printhead lasts around 1,700 pages before replacement. Is there a reason this happens? Are these printheads supposed to be replaced often? Compared to the original cartridge, which I believe only prints around 300 pages, these numbers seem higher, but I am not sure what is considered normal.

Answer:

For your Canon E4570, the page count you are getting from the black printhead is actually about right for this type of cartridge-based Canon printhead system. A black cartridge printhead lasting around 1,200 to 1,500 pages is within a reasonable range, especially when the printer has been modified with an external ink tank. The color printhead can usually last longer, and in many cases, a color cartridge printhead may go around 4,500 pages, depending on how it is used, what kind of ink is used, how often the printer prints, and whether the ink flow remains stable.

The important thing to understand is that Canon cartridges such as the PG-240, CL-241, PG-245, and CL-246 are not just ink containers. They also contain the actual printhead nozzles. That means when we refill or modify these cartridges, we are extending the life of a disposable printhead system. The cartridge may be refillable, but the printhead portion is still a wear item. It was not originally designed to last forever.

Canon thermal inkjet printheads work by heating tiny amounts of ink inside microscopic chambers. The heat creates a bubble that pushes ink out through the nozzle. This happens thousands of times during printing. Because heat is involved, the printhead depends on a steady ink supply to cool and protect the nozzles. If the ink flow is weak, if air gets into the line, or if the cartridge runs partially dry, the nozzles can overheat and burn out. Once that happens, cleaning usually will not restore the damaged nozzles.

That is one reason black printheads often wear out faster. Black printing is usually used more heavily than color printing. If most of your 1,200 pages are text documents, the black nozzles are firing constantly, while the color nozzles may only be used lightly or occasionally. Even if the color cartridge is installed, it may not be doing the same workload as the black cartridge. So the black cartridge printhead naturally reaches the end of its usable life sooner.

Another factor is the external ink tank modification. A side-mounted ink tank can work, but it must maintain the correct ink flow and pressure. If the tank is too high, too low, poorly vented, or if the tubing has air bubbles, the cartridge may not feed ink correctly. A slight ink starvation problem may not be obvious at first, but over time it can shorten the printhead's life. The printer may still print, but the nozzles may be running hotter than they should because ink is not reaching them consistently.

The original cartridge page yield you mentioned, around 300 pages, is usually based on standard cartridge yield estimates under controlled coverage conditions. When people refill cartridges or use an external tank system, they often get far more pages because they are no longer limited by the small amount of ink inside the original cartridge. However, extending the ink supply does not make the printhead permanent. The printhead still has a physical life limit.

For your black printhead, 1,200 to 1,500 pages is a reasonable expectation. If you are getting about 1,200 pages, I would not consider that unusually low, especially if you print mostly black text. For the color printhead, 1,700 pages may be lower than expected if you are doing only light color printing. In a good setup, color may last closer to 4,500 pages, but that number can drop if the printer does frequent color cleaning cycles, prints color-heavy pages, uses thick or poor-flowing ink, or has any air/pressure issue in the external tank system.

If you want to extend the life of the printheads, make sure the ink tank is positioned correctly, the tubes are free of air bubbles, and the cartridge is never allowed to run dry. Also avoid unnecessary deep cleanings. Deep cleaning consumes a lot of ink and puts extra stress on the printhead. If you see missing lines in the nozzle check, it is better to identify whether the issue is clogging, air in the line, or electrical nozzle failure before repeatedly running cleaning cycles.

You should also use ink that is appropriate for Canon thermal inkjet cartridges. Ink that is too thick, too fast-drying, or not compatible with thermal printheads can increase clogging and overheating. A cartridge may still print with the wrong ink for a while, but the long-term life of the nozzles may be reduced.

In short, yes, these cartridge-style printheads are meant to be replaced eventually. They are not permanent printheads like some larger printer systems. With modification and refilling, you can get far more pages than the original cartridge yield, but the printhead itself still has a limited service life. Your black result of about 1,200 pages is close to normal. The color result of 1,700 pages may be somewhat short if usage is light, and I would check the ink flow, tubing, tank height, air bubbles, cartridge venting, and ink compatibility to see if the color side is being stressed.

Addressing printer issues can be a complicated affair because many of these problems require hands-on inspection. For that reason, we are not able to provide remote troubleshooting, suggestions, or support for printer repairs. However, we do offer an in-person evaluation and repair service through our local diagnostic facility, BCH Technologies Printer Repair Service [https://bchtechnologies.com/printer-repair-service]. Because demand is high, we operate on a first-come, first-served basis, so it may take a few weeks before we can schedule your printer for drop-off. Our services are structured to repair either the whole printer or specific parts, with clear instructions on how to proceed. We also understand that our rates may not be the most economical option, so we highly recommend starting with self-help and online research. You can search YouTube or visit our YouTube channel homepage at BCH Technologies on YouTube [https://youtube.com/@bchtechnologies]. Once there, use the search icon next to "About" on the right-hand side of the menu bar to look for videos related to your specific issue. I receive dozens of questions every day asking for videos on specific topics, and after creating videos for many years, it is difficult to remember every single one. Using YouTube's search function is usually the fastest way to find the right video, and YouTube may also suggest helpful videos from other channels.

Thank you again for reaching out and for supporting BCH Technologies. I appreciate your question, and I hope this helps explain why the black and color printheads may have different lifespans in a modified Canon external ink tank setup.