Brother DCP 8040 - B/W Laser - All-in-One Service Manual page 251

CHAPTER 6 TROUBLESHOOTING
I-17 Black band
Possible cause
Corona failure
Corona failure
Step Check
1 Is the wire cleaner at its home
position?
2 Is the corona wire dirty?
Result
No Return the wire cleaner
to its home position.
Yes 1) Clean the corona
2) If the problem still
6-48
Remedy
contacts
wire.
appears after
cleaning, replace
the drum unit.
Ground
(2)
(2)