Remove the toner cartridge of the missing color.
Remove 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.
Remove, and then insert the developer unit of the missing color.
Insert the imaging kit.
Insert the toner cartridge.
Print the document.
Are some colors missing on prints?
Contact customer support.
The problem is solved.