Brother MFC-L8600CDW - Manual (Page 99)

Routine maintenance
87
A
Cleaning the corona wires
A
If you have print quality problems or the
Touchscreen displays Drum !, clean the
corona wires as follows:
a
Make sure that the machine is turned
on.
b
Press the front cover release button and
pull open the front cover.
c
Hold the blue handle of the drum unit.
Pull the drum unit out until it stops.