Brother iPrint&Scan MFC-8950DW - Manual (Page 71)

Routine maintenance
65
A
Cleaning the corona wire
A
If you have print quality problems or the LCD
shows Drum Error, clean the corona wire
as follows:
a
Leave the machine turned on for
10 minutes for the internal fan to cool
the extremely hot parts inside the
machine.
b
Press the front cover release button and
then open the front cover.
c
Take out the drum unit and toner
cartridge assembly.
WARNING
HOT SURFACE
After you have just used the machine, some
internal parts of the machine will be
extremely hot. Wait for the machine to cool
down before you touch the internal parts of
the machine.