CP2020 leaving 2 vertical lines on the printed pages

Our CP2020 has began to leave the two vertical lines to the bottom of every printed page - more print on the page, the more visible the lines. I printed a test page and join to view.

We don't have any kind of warranty or service contract but I am the IT Manager and can do an interview or anything else that is necessary, I don't know what needs to be done to solve this problem. Thank you!!

Replace the black toner cartridge if lines are only in black.

Tags: HP Printers

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