Brother MFC990CW Service Manual page 255

(14) Take out the ink supply tubes routed on the lower cover.
(15) If the main PCB has not been removed, disconnect the ink cartridge detection sensor
harness and the ink empty sensor harness from the main PCB.
(16) Lift the ink refill ASSY up and out of the lower cover.
Note: On the back of the ink refill ASSY is an ink foam that may be stained with ink. If it
is excessively stained, replace it.
Ink supply tubes
Black
Yellow
Cyan
Magenta
Tube guide
Tube
guide
Black
Yellow
Cyan
Magenta
Assembling Note: After mounting the ink refill ASSY, route the ink supply tubes on the
lower cover, aligning the four colors in the order as shown above.
Head joint
Ink cartridge
detection
sensor harness
Lower cover
(Front)
Sponge
6-71
Ink foam in this case
Ink cartridge detection
sensor PCB
Ink refill ASSY
Ink empty sensor
harness
Lower cover
Tube guide
(6_61)
Confidential