SOURCE: Brother MFC-8500 prints solid gray pages
I have seen the Toner cartridge in these cause this and also thought it was drum but new toner actually fixes it, have you installed new gen toner as well as drum? Make sure you tell machine you have fitted new drum too,
SOURCE: Brother MFC-440CN won't print color
Did you use generic carts?
Do use only original brother ink carts!
Only these have special cleaning fluids mingled with the ink.
There are several advantages, too:
You can run a special cleaning mode (DO insert original carts at first!!!)
Press menue then start bk copy then fourtimes arrow-up.
machine should switch to maintenance mode (buttons will flash).
press 7 then 6 then 4 then start bk copy. machine will refresh ink within the tubes and the print head and run a special cleaning routine. when finished press 7 then 6 then 3 then start bk copy to run a power cleaning. leave the maintenance mode by pressing 9 then 9.
The machine should print without proböems. If there is a poor quality left, the printhead is affected by bad ink and cant be fixed anymore.
SOURCE: poor print quality from Brother MFC-8860DN
Replace the drum. The drum is failing.
When you replace the drum open the front door of the machine where thr drum and toner is.
Hit the clear/back button. Press 1
That resets the drum count after you replaced the unit.
SOURCE: BROTHER MFC-210 PRINTING IN BLACK INK POOR QUALITY
Try cleaning the black printer heads several times in a row, at least 5 times then print a black document with best quality setting.
Press the ink button, then down to select select cleaning and then press menu/set and menu/set again to select black.
SOURCE: Brother MFC-5890CN Printer
It sounds like your print heads may need cleaning. However, here is the link from Brother support for your MFC-5890CN on how to improve print quality:
Brother MFC 5890 Print Quality
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