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Run the "disable cartridge check" It will be in the Diagnostics. Once you start the test, you can remove all the cartridges. Put the cyan in the black cartridge slot. print a config page. If it is all blue, you have another bad cartridge. If it prints correctly(minus the other colors)...continue Now put the magenta in the cyan cartridge slot. Print the config page again. If you have red all over the page, you have a problem with the slot itself. Press the STOP button and then select EXIT diagnostics. Put the cartridges back where they all go and run CALIBRATION more than once. Select/menus/down arrow/configure devce/select configure device Down arrow/print quality/seect print quality Down arrow/ calibrate now. Select it and wait.
On this machine you have to install inks with power on and use the ink button and choose replace ink. If you just plug them in it won't register and reset the counts. You may need to run clean cycles at least twice to get proper colors.
I've refilled the toner cartridges a few times now and never had a problem with vertical streaks until recently. I refilled both the cyan and magenta and when I ran the test page I had dark vertical streaks on both sides. I fiddled around cleaning things, running cleaning paper through, changing reset resistors but to no avail so eventually decided to buy a replacement refurbished cyan cartridge since the streaks looked mainly blue and bingo... well almost now I just have very light magenta streaks. The issue is obvious when I compared the old and new cartridge, the replacement toner is a much duller cyan and is of the wrong consistency since once it's been in the printer everything gets covered in it which is why I think it causes the banding to occur. I'm just trying to work out now whether to try refilling the magenta again (v. messy) or just go for another refurbished cartridge (£34).
It sounds as though a cartridge is faulty.
To determine which one, the easiest way is to run a page of text/block of colour through in yellow then cyan then magenta. which ever page comes out with the streaks on it will tell you which cartyridge to ditch and replace.
Hope this helps