Brother HL-600 Service Manual page 57

I-6 Black vertical streaks
Possible cause Step
Drum unit 1
failure
Soiling of the 2
paper feed
system
Corona failure 3 Has the corona wire cleaner failed to return to
its home position?
Are each area around 10mm from the both
side of paper soiled with faint black streaks?
Corona failure Is the corona wire soiled?
4
Scratch on the
5
drum
Cleaning failure Is the drum surface soiled is streakily?
6
Scratch on the Is the drum surface still soiled streakily even after
7
fixing unit replacing the drum unit?
Black and blurred vertical stripes
Check
Is the vertical streak about 1 ~ 5 length
at 94mm internals?
Is the paper tray or feed system on the drum
unit soiled with toner?
Is the surface of the drum scratched?
Result
Yes
Yes
Yes
Yes
Yes
Yes
Yes
IV - 7
Remedy
Replace the drum unit.
Clean the toner off.
Return the wire cleaner to
its home position.
Clean the corona wire.
Replace the drum unit.
Replace the drum unit.
Replace the fixing unit.