Brother Intelli FAX-2820, Service Manual

Page: 48 / 321

Confidential 3 - 3
3.2.1 Scanner Mechanism
3.2.2 Document Feeding and Ejecting Mechanism
This mechanism consists of the document base ASSY, automatic document feeder (ADF), document
ejection roller ASSY, and document sensors. (For details about the sensors, refer to
Section 3.2.5 .)
If you set documents on the document base ASSY with their faces down and start scanning
operation, then the scanner motor rotates so that the ADF (which consists of the document
separation roller, nip-related parts and ADF parts) feeds those documents into the equipment,
starting from the bottom sheet (first page) to the top (last page), page by page. Each document
advances with the LF roller to the CIS unit, and then it is fed out of the equipment with the
document ejection roller ASSY.
3.2.3 Scanner
The scanner uses a contact image sensor (CIS) unit which consists of an LED array illuminating
documents, a self-focus lens array collecting the reflected light, a CIS PCB carrying out
photoelectric conversion to output picture element data, and a cover glass on which a document
advance. When the document passes between the document pressure bar and the cover glass, it is
scanned.
The black/white scanner is provided with the machine.
Document
Document base ASSY
Separation rubber
Pinch roller
CIS unit
Pressure roller
Paper ejection tray
Document ejection roller
ASSY
Actuator F
Actuator R
LF roller
Separation roller