Brother HL-820, HL-1020, HL-1040 manual All black

I-4

All black

Possible cause	Step	Check	Result	Remedy	HV.GND
					contacts
					(Fig.4-5)
Corona failure	1	Is the corona wire of the drum	Yes	Replace the drum
		unit broken?		unit.
	2	Are the electric terminal	Yes	Clean the terminals
		springs in the printer body and		in the printer and on	➅
		the electrode on the bottom		the drum.
		face of the drum unit dirty?
Harness	3	Is the scanner unit connected	No	Check the harness
connection		with the panel sensor PCB		connection between
		correctly?		the scanner unit and
				the panel sensor
				PCB.
High-voltage	4	Is the problem solved after	Yes	Replace the high-
power supply		high-voltage power supply		voltage power supply
PCB		PCB replaced?		PCB.
Ditto	5	Perform the same check as in	Yes	Replace the panel
		step 3.		sensor PCB.
Main PCB	6	Is the problem solved after	Yes	Replace the main
		main PCB is replaced?		PCB.
Panel sensor	7	Is the problem solved after the	Yes	Replace the panel
PCB		panel sensor PCB is replaced?		sensor PCB.

IV-8