Brother MFC9100C Service Manual page 77

1.13 NCU PCB
(1) Disconnect the head flat cables from the main PCB.
(2) Pull the flat core of the head flat cables up and off the core support.
(3) Disconnect the NCU harness from the main PCB.
(4) Open the cable clamp and release the harnesses.
(5) Remove the two screws (three screws if the side cover L has not been removed).
(6) Slide the NCU bracket to the left (when viewed from the rear) and to the rear.
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