Brother HL-1870N - Page 233

HL-1850/1870N SERVICE MANUAL
6-49
I-17 Black band
Possible cause Step Check Result Remedy
Ground
contacts
Corona failure 1 Is the wire cleaner at its home
position?
No Return the wire
cleaner to its home
position.
(2)
Corona failure 2 Is the corona wire dirty? Yes 1) Clean the corona
wire.
2) If the problem still
appears after
cleaning, replace
the drum unit.
(2)