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Take the toner cartridge out of the printer, shake it gently 5 or 6 times to evenly distribute the toner, and then reinstall the toner cartridge. If this does not solve the problem, replace the toner cartridge with a new one. [Replacing the Toner Cartridge]
Paper is too moist or too dry.
Replace the paper with appropriate one and print again. [Usable Paper]
The toner cartridge has deteriorated or is damaged.