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First do not use cartrigde compatible or refill because you clogged the print head,is verry sensitive.If you try to clean the print head and nothing you need to replace the print head is the only solution,after replace the print head you print all the colors.
NOTE!!! After you replace the print head use only original cartridge brother !!!!
You said you just replaced the ink jets. Did you clean the print heads? Here is Link on Web. If you find this helpful pls rate me. Thanks http://www.brother-usa.com/ModelDocuments/Consumer/Users%20Manual/UM_MFC_210C_420CN_EN_286.PDF How to improve print quality Cleaning the print head To ensure good print quality, the MFC will regularly clean the print head. You can start the cleaning process manually if needed. Clean the print head and ink cartridges if you get a horizontal line in the text or graphics on your printed pages. You can clean Black only or three colors at a time (Cyan/Yellow/Magenta), or all four colors at once. Cleaning the print head consumes ink. Cleaning too often uses ink unnecessarily. Caution Do NOT touch the print head. Touching the print head may cause permanent damage and may void the print head’s warranty. 1 Press Ink. 2 Press ▲ or ▼ to select Cleaning. Press Menu/Set. 3 Press ▲ or ▼ to select Black, Color or All. Press Menu/Set. The MFC will clean the print head. When cleaning is finished, the MFC will go back to standby mode automatically. If you clean the print head at least five times and the print has not improved, call Brother Customer Service (see Brother numbers on page i).
You got to re-check back the Ink Cartridge you've buy recently.. Sometime the ink already freeze inside the cartridge bcoz its been really-really-really long time they keep before the usage.. Ive also have experience about problem like this b4, so better re-check/change back the cartridge.. Or If the
printer head is not at the cartridge, it is seperate from the cartridge, you have to check back the printer head also.. normally all the new printer head comes together with the cartridge.. and prefer to use the Original Cartridge more than Pirated Cartridge ok.. Cheap Cartridge always giv a lot of problem, especially like Your problem.. Thats All, Good Luck and Happy Trying..
Which cart arent recognized? The yellow one or the cyan(blue) one or both?
Unplug machine from power. Wait three minutes. In this time take all carts out and close cover. reconnect machine to power. Machine demands carts. Open cover. Reinsert carts. Make sure that the support clip of the cart.holder is secured above the cart cover.
If you still have probs with one cart. the led contact on the circuit board is defectiv. You need a new cart holder then, which can be ordered as a spare part from a service partner near your home (see brother homepage).
If you have used third party carts before you can't repair this problem due to the fact that the filter inside the printhead is clogged with particles. There is no chance to clean the filter. Sorry.
Do use only dye ink.
Pigmented ink is the printhead killer for brother printers!