Brother HL-1040 - Manual (Page 84)

IV-17
I-19 Downward fogging of solid black
Possible cause Step Check Result Remedy
Drum unit 1 Is the problem solved after
replacing the drum unit? Yes Replace the drum unit.
High-voltage
power supply
PCB 2 Is the problem solved after
replacing the high-voltage
power supply PCB? Yes Replace the high-voltage
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
between the printer body and
the drum unit dirty? Yes Clean both electrodes. ➈
SR connection
failure 2 Are the SR electrodes
between the printer body and
the drum unit connected
correctly? No Check the SR
connection.
Feed roller 3 Are the feed roller shaft and
the ground contact
connected correctly? No Check the connection
between the shaft and
the ground contact. ➉