Prints thick black lines

In the process used printer, will be inevitable printed page by your printer have the bad quality prints. For example: Toner specks, Light image, Vertical line, Dropouts, background, Toner smear, Vertical black line and band, Vertical white line, Background scatter, Black pages, Loose toner, Horizontal stripes, Ghost, Uneven Density, poor fusing.

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try to replace magenta , Yellow , CYAN

Remove cartridge observe on cartridge drum finds any vertical toner line? replace cartridge, as well as check all cartridges same manner...if found replace them..If its only on copying: clean flat bed both glasses..with glass cleaner..

This is caused by a damaged drum. The drum is the long metal cylinder inside the toner cartridge. You will have to replace the hold cartridge. You should be able to flip a plastic cover on the toner and see the drum. If it has black toner lines then it usually means the drum is scratched and there for toner fills the scratch and produces lines.
Replace the print cartridge (toner cartridge) and the lines should go away.

Easiest step to do would be replace your toner.
Next Step is 1/2 self test page. This means start a print job and after the paper is picked up open the toner cartridge door and cause a jam. The paper that you see after you remove the toner will show the current print. If the mark is seen on the paper there then it is the toner cart. If you dont see it on the paper then it is most likely your fuser causing the issue.

try cleaning the rollers with water in the feeder at the top check the glass too too see if it's dirty

try another toner cartridge, that should solve it, if not, it is the fuser and it's cheaper to buy a new printer

1- black lines are from the drum: it has burnt out on that particular spot and rotates

2- the white horizontal gap space if it is not you skipping space is also from the drum

3-the white Vertical is most likely from the developper (unit that has the toner and is against the drum, look at the roller it should be solid black, maybe there is something on it : hair paper etc....

Here is the scoop! There are two (2) components to the fax machine, one is the scanner portion which is located just past where the paper you are copying or faxing enters the machine, separate the two sides and access the imaging plate, clean this area with denatured alcohol.
Step two is to clean the toner and drum unit, get the mirror at the back of the toner and under the toner. If after this you are still getting lines on the prints you will have to replace the drum unit KX FA-84 about $85. Happy faxing, Ken

Hi best way to check is to remove the black photoconductor and you should be able to see the little lines on it also check the the black dev/toner unit for the lines. most likely to be the black photoconductor unit though.

Thanks J