Brother MFC 9970CDW - Manual (Page 92)

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e
Hold the green handle of the belt unit
with both hands and lift the belt unit up,
then pull it out.
f
Remove the two pieces of orange
packing material and discard them.
Note
This step is only necessary when you are
replacing the waste toner box for the first
time, and is not required for the
replacement waste toner box. The orange
packing pieces are installed at the factory
to protect your machine during shipment
from the factory.