I do not know enough to state as fact, but there are times after a cartrige change where it can go Dry after printing a few full print pages, and still require a head cleaning to get the ink back down. It might not be fully "primed" anyway, depending on how it ran out. Other notes: Even if a nozzel check works, or a test page works, there is no guarentee that the thing will print 10 full color pages after that. Always make sure you park your heads/cartrige (turn off) on the printer before pulling the power on it. When you release the POWER button, the test page will begin to print. Press and hold the POWER button until you hear the number of beeps that correspond to the test page you want to print. ![]() To print a test page, make sure the printer is turned off and paper is loaded. I feel it is better to keep your inkjet printer printing a few pages a week, instead of drying out, because of the head cleaning taking so much ink. Printing the Test Pages Using the Operator Panel. Notes: Using CIS or cheap inks does have a tendancy to clog more, and I would not recommend them for minor use (pita it is). A nozzel check uses a very very small ammount of ink, and can represent all aspects of operation quickly. We have all kinds of color printer test page ranging from Colored to CMYK as well and we also host laser printer test pages, even printer test page black and white. If your printer uses a nozzel check it would be better than a test page, because it uses every jet in the thing to print. ![]() If you have spare paper that you have used already, but would throw out, you could print a test page, or a nozzel check, or anything else you want, without fear that it will drain your carts, as much as a head cleaning would. ![]() However, the M454dw has a better black page yield, and its a little faster at printing black and white documents. The M479fdw also has a higher color page yield and a better display screen. The ammount of ink used for a head cleaning, or multiple head cleanings does not even compare to printing an entire page of a colorful print. The HP Color LaserJet Pro MFP M479fdw is a variant of the HP Color LaserJet Pro M454dw but with a scanner added. I use a CIS (continuous ink system) for more than one epson printers, and I can tell you for sure, it is the "Head Cleaning" itself that uses the most ammount of ink by far.
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