Brother MFC-J6720DW - Manual (Page 108)

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b
Press the lock release lever as shown to
release the cartridge color indicated on
the Touchscreen. Remove the cartridge
from the machine.
c
Open the new ink cartridge bag for the
color indicated on the Touchscreen, and
then take out the ink cartridge.
d
Turn the green release lever on the
orange protective packing (1)
counterclockwise until it releases the
vacuum seal. Then remove the orange
protective packing as shown.
IMPORTANT
DO NOT touch the cartridge in the area
indicated (2); this can prevent the
machine from detecting the cartridge.
1
2
1
2