Brother MFC-790CW User Manual page 157

a
Open the ink cartridge cover.
If one or more ink cartridges are empty,
for example Black, the LCD shows
B&W Print Only or Cannot Print.
b
Press the lock release lever as shown to
release the cartridge indicated on the
LCD. Remove the cartridge from the
machine.
c
Open the new ink cartridge bag for the
color shown on the LCD, and then take
out the ink cartridge.
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d
Turn the green knob on the protective
yellow cap clockwise until it clicks to
release the vacuum seal, then remove
the cap (1).
e
Each color has its own correct position.
Insert the ink cartridge in the direction of
the arrow on the label.
1