Black lines down the page |Brother

Black lines down the page

Print Quality Problem - Black lines down the page

Black lines down the page.

Printed pages have toner stains down the page.

Check the following points to resolve the issue:

Clean the corona wire inside the drum unit by sliding the green tab.
> Click here to see how to clean the corona wire of the drum unit.
Make sure the green tab of the corona wire is in the Home position (1).
Wipe the scanner glass strip with a dry lint free soft cloth.
> Click here to see how to clean the scanner glass strip.
The toner cartridge may be damaged. Replace the toner cartridge with a new toner cartridge.
> Click here to see how to replace the toner cartridge.
The drum unit may be damaged. Replace the drum unit with a new drum unit.
> Click here to see how to replace the drum unit.
The fuser unit may be contaminated. Contact Brother Customer Service from the "Contact Us" section.