Brother HL-820, HL-1020, HL-1040 manual Downward fogging of solid black, Horizontal lines

I-19

Downward fogging of solid black

Possible cause	Step	Check	Result	Remedy
Drum unit	1	Is the problem solved after	Yes	Replace the drum unit.
		replacing the drum unit?
High-voltage	2	Is the problem solved after	Yes	Replace the high-voltage
power supply		replacing the high-voltage		power supply PCB.
PCB		power supply PCB?

I-20

Horizontal lines

Possible cause	Step	Check	Result	Remedy	HV.GND
					contacts
					(Fig.4-
					5,4-7)
SR electrode	1	Are the SR electrodes	Yes	Clean both electrodes.	➈
		between the printer body and
		the drum unit dirty?
SR connection	2	Are the SR electrodes	No	Check the SR
failure		between the printer body and		connection.
		the drum unit connected
		correctly?
Feed roller	3	Are the feed roller shaft and	No	Check the connection	➉
		the ground contact		between the shaft and
		connected correctly?		the ground contact.

IV-17