Remove, and then reinstall the imaging kit.
Warning—Potential Damage: Do not expose the imaging kit to direct light. Extended exposure to light may cause print quality problems.
Warning—Potential Damage: Do not touch the photoconductor drum under the imaging kit. Doing so may affect the quality of future print jobs.
Print the document.
Is the printer printing solid color or black images?
Contact customer support.
The problem is solved.