Brother International MFC 8890DW Service Manual - Page 47
ADF scanning and document glass scanning. These two scanning methods are
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4. Internal structure The automatic document feeder (ADF) consists of the pick-up roller, separation roller, paper feed rollers 1/2/3/4, eject roller, ADF motor, switch back sensor, document rear sensor and document front sensors 1/2. For further details on the sensors, see 3.6 Sensors position. Switch back sensor Flap C Paper feed roller 1 Paper feed roller 2 Flap B SB roller ASSY Separation roller Pick-up roller Document rear sensor actuator Paper feed roller 3 Document front sensor actuator 1 Document front sensor 1 Document front sensor actuator 2 Document rear sensor Switch back sensor actuator Eject roller Document front sensor 2 Paper feed roller 4 Flap A Fig. 2-7 The duplex scanning mechanism allows you to use the following two types of scanning, "ADF scanning" and "document glass scanning". These two scanning methods are switched depending on whether the document front sensor 1 detects the document or not when starting scanning. However, there is the case that the "document glass scanning" is given priority to over by a state of the document cover sensor (described later). 2-9 Confidential