Brother MFC-9840CDW, DCP-9045CDN Faint print, White spots on one color image

Faint print

User Check

- Check that the machine is installed on a level surface. - Replace the toner cartridge with a new one.

- Clean the scanner windows with a soft cloth.

Step	Cause	Check	Result	Remedy
1	Laser unit failure	Is the problem solved after	Yes	Replace the laser unit.
		replacing the laser unit?
2	Toner empty	Is the “Toner Life End”	No	Replace the toner sensor
	sensor failure	message indicated on the		PCB ASSY (TE/NEW) of
		LCD after replacing the		the appropriate color.
		current toner cartridge
		with an empty one?

White spots on one color image

User Check

-Toner may be empty. Replace the toner cartridge with a new one.

-If the same problem occurs after printing a few pages, the adhesive of a label or the like, paper powder or dirt may be attached on the surface of the exposure drum.

When the size of the white spots is less than 0.35mm, feed the drum cleaning sheet from the MP tray one to three times to clean the drum.

(For the procedure, refer to “Drum Unit Cleaning Mode” in Chapter 5.)

When the size of the spots is 0.35mm or more, or when the same problem occurs after feeding the drum cleaning sheet, wipe off the dirt on the exposure drum with a cotton swab. (For the procedure, refer to Note in the next pages.)

-The drum unit may be damaged. Replace the drum unit with a new one.

Step	Cause	Check	Result	Remedy
1	Drum unit failure	Are the white spots at	Yes	If the exposure drum
		75.0 mm (exposure drum		surface is scratched,
		circumference) intervals?		replace the drum unit.
2	Drum unit	Are the electrodes on the	Yes	Clean both electrodes.
	connection failure	drum unit and machine
		body dirty?
3	Transfer HVPS	Is the problem solved after	Yes	Replace the transfer
	PCB failure	replacing the transfer		HVPS PCB ASSY.
		HVPS PCB ASSY?
4	Charge HVPS	Is the problem solved	Yes	Replace the charge
	PCB failure	after replacing the charge		HVPS PCB ASSY.
		HVPS PCB ASSY?

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