Brother MFC5200C Service Manual page 40

This scanner mechanism supports a dual scanning system.
(1) If you set documents on the document guide base with their faces up and start the scanning
operation, then the ADF motor rotates to pull in those documents into the ADF unit, starting
from the top sheet to the bottom, page by page. Each document curves downwards and turns to
the right with the document feed roller so as to advance above the CCD unit, and then it is fed
out to the document cover with the document ejection roller ASSY.
This way, documents move above the CCD unit being kept in a stationary position.
(2) If you open the ADF & document cover ASSY, put a sheet of document with its face down (or
put a bound book opened) on the glass of the scanner top cover, close the ADF & document
cover ASSY, and start the scanning operation, then the CCD drive mechanism will be driven.
The CCD motor built in the CCD unit rotates. As illustrated below, the CCD drive gear and
idle pulley carry the CCD drive belt on the underside of the CCD unit, so clockwise and
counterclockwise rotations of the CCD motor move the CCD unit to the right and left,
respectively.
In this scanning system, the CCD unit moves horizontally beneath a document being kept in
stationary position.
CCD unit
turned upright
The CCD unit contains a charge coupled device (CCD) image sensor. The cold-cathode
fluorescent lamp illuminates a document and the reflected light of the scanned image data is
transmitted via the mirrors into the lens which reduces the scanned data so as to form the image on
the CCD.
CCD drive belt
CCD motor
gear
4 -5
Underside of the
CCD unit turned
upright
CCD drive gear
CCD idle pulley
Scanner base