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The symptoms point to some kind of contamination between the cyan and yellow. Most likely is that the yellow nozzles are picking up a small amount of cyan in the cleaning/resting pad when the printer is waiting to print... it's also possible the printhead has started failing and is allowing ink to mix somewhere before the nozzles...
The former is more likely however, especially if you are able to print a few pages of yellow where the greenish tint/lines fade out to become pure yellow.. but then re-appear after the printhead has rested.
Causes of this problem tend to be a backed up waste ink tube or failed pump.. Again it's more likely the former, especially if you've been resetting the waste ink counter and ignoring pad replacement or redirection of the waste ink.
Simplest solution is to locate the waste ink tube (accessible via the access hatch in the back of the printer) and then flush the tube through using a syringe of warm water (don't use excess pressure). Then fit an external waste tank so that the pad ink doesn't back up again (and solve the waste ink issue at the same time).
Obviously if the printhead or waste pump are failing then you have no other options beyond a new printhead, reconditioned model or new printer.
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).
Assuming that you are using original Canon cartridges or a brand of Compatibles that you have used before.
If print results are blurred, colors are faded or not printed correctly, the pint head nozzles are probably clogged. Follow the procedure below to print the nozzle check pattern, check the print head nozzle condition, then clean the Print Head. You may have to do this 2 or 3 times. If printed ruled lines are misaligned or print results are otherwise unsatisfactory, aligning the Print Head may improve print quality. Caution Do not rinse or wipe the Print Head and ink tanks. This can cause trouble with the Print Head and ink tanks. Note Before performing maintenance Open the Top Cover and make sure that all lamps on the ink tanks are lit red. If not, see Checking the Ink Status and take an appropriate action. Increasing the print quality in the printer driver settings may improve the print result.
you need to change the printheads but first take a cotton swab dip it in water and then clean the printheads copper contacts and the place the printheads sit inside the printer .place the printheads back inside and now try to print if u still face the issue replace the printheads and then check whether it still gives a problem if it does call in to hp and they will replace the printer. 1800-474-6836
What you are describing is a bad print head. You can try running the eliminate light stripes several times, and jet substitution, but most likely the print head will have to be replaced to remedy your problem. You can try googling. Phaser printer print heads or phaser printheads. There seems to be a secondary market appearing for those print heads. I can tell you from Xerox, if you have no maintenance agreement, they cost $750 per print head. Honestly, having worked on about every type of color printer known to man, the new solid ink phaser printers, produce a dry ink image of 2400 x 2400 dpi with ink particles that align end to end. The resolution of those printers are remarkable and can be purchased for less than the price of one of those new print heads. Now for reliable, albeit somewhat not as sharp a color image, but still exceptional, you really can not beat an HP. The ink stick technology really no longer has the color vividness advantage it initially had. The inks that align end to end, have ended that advantage and are sure a lot cheaper to operate per page.
If the issue is occuring in the same place on all prints, try the imaging drum (can't remember if this printer even uses one) or the transfer belt/roller (not sure which it uses). If you phone Dell support, they should run you through troubleshooting and send you either of those parts free of charge if you are under warranty. If not, buy them anyways; they don't degrade over time (if kept in the dark) and can be saved for when the currently installed one runs out if you don't need it to fix this issue.