Brother Copier/Printer MFC-9970CDW - Manual (Page 90)

74
l
Push the drum unit in until it stops.
m
Close the front cover of the machine.
Note
After you replace a 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 wires
A
If you have print quality problems, clean the
four corona wires as follows:
a
Press the front cover release button and
then open the front cover.