Brother MFC 7860DW - Manual (Page 78)

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Note
After replacing the toner cartridge, DO
NOT turn off the machine's power switch
or open the front cover until the LCD
clears the Please Wait message and
returns to Ready mode.
Cleaning the corona wire
A
If you have print quality problems, clean the
corona wire as follows:
a
Open the front cover and leave the
machine turned on for 10 minutes to
cool down.
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.
b
Slowly take out the drum unit and toner
cartridge assembly.
CAUTION
We recommend that you place the drum
unit and toner cartridge assembly on a
clean, flat surface with a sheet of
disposable paper or cloth underneath it in
case you accidentally spill or scatter toner.
Handle the toner cartridge carefully. If toner
scatters on your hands or clothes,
immediately wipe or wash it off with cold
water.