Why is my Brother printer printing black lines?

Black, cyan, magenta, or yellow vertical lines or streaks can be caused by a dirty corona wire, a toner cartridge, or the drum unit.

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Moreover, how do you fix black lines when printing?

Fix the issue of printers causing black lines on paper

  1. Clean the rollers. Made of soft rubber material, rollers act to move the paper inside the printer for the print to take place. …
  2. Replace the drum. …
  3. Clean or replace the fuser. …
  4. Clean cartridge nozzles. …
  5. Extract, clean and reinsert the cartridges.

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