Brother MFC MFC-9120CN User Manual page 196

IMPORTANT
To avoid print quality problems, DO NOT
touch the shaded parts shown in the
illustration.
184
e
Remove the orange packing material
and discard it.
h
Note
This step is only necessary when you are
replacing the waste toner box for the first
time. The orange packing is installed at
the factory to protect your machine during
shipment. The orange packing is not
required for replacement waste toner
boxes.