Brother MFC620CN Service Manual page 160

Document front and rear sensors, document pull-in roller, and document separation roller
15) Remove the two screws and take the ADF reinforcement plate off the ADF unit.
16) Remove the document front and rear sensors by unhooking the three latches each. Disconnect
the ADF harness from each sensor.
17) Remove the document pull-in roller by lightly pressing the corresponding locking arm and
sliding the roller to the rear.
Remove the document separation roller by lightly pressing the corresponding locking arm and
sliding the separation roller gear shaft to the rear.
(The document pull-in roller and separation roller are compatible with each other.)
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Confidential