Brother DCP-8070D Service Manual page 66

6. ADF duplex scanning (The document moves over the immovable scanner module.)
CCD model
(1) Set the document face up into the document chute. When the machine starts duplex
scanning, the ADF motor is rotated clockwise, the pick-up roller draws the
document, and the separation roller and separation pad send a sheet of the
document to the ADF one by one from the top page of the stacked documents.
(2) The document is passed through the paper feed rollers 1, 2 and 3, and is passed
over the CCD module so that the document is scanned. Then, the document is sent
for the specified distance by the switch back roller ASSY, and the switch back roller
ASSY is turned counter so that the document is drawn again.
Paper feed roller 2
Paper feed roller 3
CCD module
(3) The drawn document is attached on the flap B and sent to the paper feed rollers 2
and 3. At this time, the opposite side of the document is faced-up so that the
backside of the document is scanned. The document is sent to the switch back
roller ASSY again.
Paper feed roller 3
Switch back roller ASSY
Separation roller
ADF motor
Fig. 2-13
Paper feed roller 4
Paper feed roller 2
CCD module
Fig. 2-14
2-13
Separation rubber
Switch back roller ASSY
Flap B
Paper feed chute ASSY
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