Brother 2150N, 2170W, HL-2140 ■Vertical streaks, ■Dirt on the back of paper, ■Black vertical streaks in a light background

■Dirt on the back of paper

Step	Cause	Check	Result	Remedy
	Scratch and Dirt	Is the pressure roller	Yes	Print approximate 10
1	on the fuser unit	ASSY dirty? Is any other		pages.
		area in the machine dirty?
			No	Replace the fuser unit.
	Scratch and Dirt	Is the paper feed system		Wipe dirt off.
2	in the paper feed	dirty?	Yes
	system

■Vertical streaks

User Check

• This problem may occur with noise which is caused by dirt on the corona wire in the drum unit. In this case, clean the corona wire with the wire cleaner.

• Replace the drum unit with a new one.

• Replace the toner cartridge with a new one.

Step	Cause	Check	Result	Remedy
	Scratch and Dirt	Is the paper feed system		Wipe dirt off.
1	in the paper feed	dirty?	Yes
	system
	Scratch and Dirt	Are there scratch and		Replace the drum unit.
2	on the exposure	dirt on the surface of the	Yes
	drum	exposure drum?
	Scratch and Dirt	Are there scratch and		Replace the fuser unit.
3	on the heat roller	dirt on the surface of the	Yes
		heat roller?

CAUTION:

If the machine prints the same pattern, especially including vertical streaks, continuously, black vertical streaks may appear on the paper since the electrostatic performance of the exposure drum is decreased temporally.

■Black vertical streaks in a light background

User Check

•Clean the inside of the machine and the corona wire in the drum unit.

•Replace the toner cartridge with a new one.

Step	Cause	Check	Result	Remedy
1	Drum unit failure	Is the problem solved after	Yes	Replace the drum unit.
		replacing the drum unit?

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