Brother DCP-9045CDN Reference Manual page 35

(4) The switch back roller ASSY is turned counter again, and the document is drawn in
again. The document is passed through the paper feed rollers 1, 2 and 3, and ejected to
the document cover by the eject roller. This is so that the stacked documents are ejected
face down in the correct order.
Paper feed roller 2
Paper feed roller 3
Scanning by the CCD unit
The CCD unit includes the charge coupled device (CCD) sensor. The cold cathode
fluorescent lamp lights the document, and the reflection from the scanned image data is
transferred to the lens by the mirror. The lens reduces the scanned data so that the image is
generated on to the CCD.
Function of the machine cover open sensor
The machine cover open sensor detects whether the machine cover is opened or not. Even if
the document is set into the ADF, the machine starts scanning the document glass ignoring
the ADF.
Function of the scanner lock lever
The scanner lock lever fixes the CCD unit in position to prevent the CCD unit from moving and
being damaged during transportation.
Function of the paper feed solenoid
The paper feed solenoid releases the pick-up roller and separation roller from the drive gear
while duplex scanning and engages them with the drive gear when the document is drawn in
order to prevent that the next document is drawn into the ADF while duplex printing.
Function of the switch back solenoid
The switch back solenoid switches the planet gear of the switch back roller.
SB roller ASSY
Eject roller
Fig. Ref2-10
Ref. 2-9 Confidential