hp color laser jet printer prints a solid black page

hp color laser jet printer prints a solid black page Recently I bought a new black toner Q6000 cartridge for my hp color laser jet printer. It worked fine at first, but now it will only print a page that is solid black. What should I do?
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Guest [Entry]

"based on all black on brother online user guide:
Clean the corona wire inside the drum unit.

The drum unit may be damaged,
Replace the drum unit with a new drum unit."