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

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Black line appear when printing what is the remendy?

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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

Posted on Apr 07, 2011

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