Brother International DCP1000 Service Manual - Page 19

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 tray 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 tray ASSY, put a sheet of document (or put a bound book opened) on the glass of the scanner top cover, close the ADF & document tray 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 drive belt CCD unit turned upright CCD moto gear Underside of the CCD unit turned I upright CCD drive gear CCD idle pulley ;o- re. Scanner base 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. 3-5