Brother MFC620CN Service Manual page 159

ADF motor and document feed roller
11) Take the ADF harness and grounding wire out of the harness guide provided on the ADF unit.
12) Remove the screw that secures the grounding wire and ADF motor together.
13) Remove the screw from the ADF motor and disconnect the ADF harness from the motor.
14) Remove the pawl bushing from the front end of the document feed roller shaft and remove the
document feed roller gear from the read end. Take the document feed roller out of the ADF
unit.
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Confidential