Brother HL-1020, HL-820, HL-1040 manual Poor fixing, Image distortion

I-11

Poor fixing

Possible cause	Step	Check	Result	Remedy
Printing paper	1	Is thick paper more than 42lb	Yes	Instruct the user to use paper
		weight in use?		of the recommended weight
				and thickness.
Toner sensing	2	Is the problem solved by	Yes	Toner is empty.
failure		replacing the drum unit or the		The toner sensing is defective,
		toner cartridge?
				clean the toner sensor.
		(When printing is faint.)		If the wiper in the toner
				cartridge is broken, replace the
				toner cartridge with a new one.
Thermistor	3	Is the thermistor fitted	No	Fit the thermistor correctly.
failure		correctly?
Low-voltage	4	Is the problem solved by	Yes	Replace the low-voltage power
power supply		replacing the low-voltage		supply PCB.
PCB failure		power supply PCB?

I-12

Image distortion

Possible cause	Step	Check	Result	Remedy
Scanner	1	Is the scanner unit secured to	Yes	Secure the unit correctly and
		the frame incorrectly?		tighten the screws.
		Is there any play?
Scanner LD	2	Is the laser diode or the laser	Yes	Replace the scanner unit.
emission failure		scanner motor defective?
Scanner motor
rotation failure
Scanner	3	Is the scanner harness	Yes	Connect the harness correctly.
connection		connected properly?
failure		Is it coming loose?

IV-12