Brother MFC-8510DN - Manual (Page 86)

74
Cleaning the corona wire
A
If you have print quality problems, 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.