Black line is on the edge or part of the page is covered in toner

Issue description

A single, broad vertical line of toner appears on the page, or also one side of the page might be black. The line will be vertical but have a fuzzy haziness or a gradient on at least one of the edges.

The line might be in different locations on the pages, as well, depending on when it was printed.

Solution

Reseat the toner cartridge

The toner cartridge or Imaging Unit (IU) may not be seated correctly. This type of print quality issue can often be resolved by just re‑seating the supplies. When installing the supplies, make sure the left and right-hand sides of the cartridge/IU are all the way in. The cartridge/IU should click into place when correctly installed.

Bright light/sunlight entering the printer

Light can enter the printer through the vent for the fan inlet. If too much light gets inside the area pointed to by the red arrow in the image below, the printer may exhibit the print quality issues described in this document. Hence, it is recommended to position the right-hand side of the printer away from bright light, especially sunlight.