Brother HL-1020, HL-820, HL-1040 manual Dark, Pcb

I-2

Dark

Possible cause	Step	Check	Result	Remedy	HV.GND
					contacts
					(Fig.4-5)
Corona failure	1	Is the corona wire dirty?	Yes	Clean the corona wire
(soiled wire)				by using the wire	➇
				cleaner.
Corona failure	2	Are the corona electrodes	No	Clean both electrodes.
(contact failure)		between the printer body and			➅
		drum unit dirty?
Drum unit failure	3	Is the problem solved when the	Yes	Replace the drum
		drum unit is replaced?		unit with a new one.
High-voltage	4	Are there any disconnected	No	Replace the high-
power supply		connectors?		voltage power supply
PCB				PCB.
Main PCB	5	Are there any disconnected	No	Replace the main
		connectors?		PCB.
Panel sensor	6	Are there any disconnected	No	Replace the panel
PCB		connectors?		sensor PCB.

IV-6