Question about Brother MFC 7420 All-In-One Laser Printer

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Everything is printing black n dirty

We have the mfc 7420 and everything we print is coming out alost all black and the drum itself is full of a thick black dust

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Most likely cause is a bad toner cartridge. It's likely dumping excessive toner inside the printer. try taking the toner out and hold it sideways and tap it, if toner falls out then your cartridge is defective. try vacuuming the printer and wipe it clean with a dry cloth and and replace the toner with a new one.

Posted on Oct 05, 2009

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My Brother MFC-7420 Printer always prints black lines and splotches down the left side of my paper. This happens whether I'm scanning or printing from my PC. When I looked at my drum, it appears a


If you are seeing vertical streaks/black lines your primary corona wire is dirty and or the fax scanner may be dirty.
1)To clean the corona wire you take the drum unit and toner cartridge and place it on disposable paper to avoid spilling.
2) Clean the primary corona wire inside the drum unit by sliding the blue tab from right to left several times.
3) Return the blue tab and snap it into the home position.
4) Reinstall the drum unit and toner cartridge.
5) Close the front cover.
Caution: if you do not return the blue tab to the home position it may repeat the black lines.

Nov 29, 2012 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Black line appear when printing what is the remendy?


Dirty print out is basically due to cartridge related issues. Take out the cartridge and clean its drum/ (green roller) with a dry, soft, lint-free cloth. The drum is usually located under a cover. Checkout for any spilled toner inside the printer and clean it also. Print a few pages so that the parts get further cleaned. I think, this would solve the issue.

Moreover, black streaks (thicker lines) and dots etc indicate faulty PCR Roller which is located behind the green drum inside the cartridge. In this case refilling would not help.
So, it is recommended that you replace the cartridge with a genuine one (not any replacement or refill).

Let me know if any further clarification is required.
Hope it helps! Good Luck!
CreativeTECH

Apr 07, 2011 | Brother MFC 7420 All-In-One Laser Printer

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You cannot color print with this printer only black and white. Its a black and white laser printer

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try moving the small blue slider on top of the drum cartridge side to side 10 times.

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The drum is defective. The cleaning blade has failed.

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We were having a lot of print quality problems, similar to what you describe. We replaced the drum and it worked fine.

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