Brother FAX 560, Service Manual

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III - 3
2.1 Scanning Mechanism
The scanning mechanism consists of the document stacker, automatic document feeder (ADF),
separation roller, document LF roller, scanner, document ejection roller, and document sensors.
(For details about the sensors, refer to Section 2.4.)
Automatic document feeder (ADF)
If you set documents with their faces down on the stacker and start the transmitting operation, the
ADF (consisting of the separation roller 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 to the scanner with the document LF roller, and then it is fed out of the equipment with
the document ejection roller.
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
advances. When the document passes between the document pressure bar and the cover glass, it
is scanned.
2.2 Printing Mechanism
The printing mechanism consists of the paper feeder, automatic cut sheet feeder (ACF), paper feed
roller 32, platen, thermal recording head, paper ejection roller, and sensors. (For details about the
sensors, refer to Section 2.4.)
Automatic cut sheet feeder (ACF) and registration mechanism
If the operator sets cut sheets into the paper feeder and receiving operation starts, the ACF (paper
feed roller 32 and ACF parts) feeds paper into the equipment, a sheet at a time. After the leading
edge of paper passes through the registration sensor actuator, the paper is further fed for the
specified time length. Accordingly, the leading edge will reach the platen where the paper skew will
be eliminated.
Printing and paper ejecting mechanism
The platen feeds the paper up to the printing position where the thermal recording head prints while
the thermal ink ribbon advances. Then the paper is fed out of the equipment with the paper ejection
roller.
2.3 Power Transmission Switching Mechanism
The facsimile equipment has a single drive motor whose power transmission route can be switched
by the planetary gear system and by changing the motor rotation direction. This switching allows the
equipment to function in five operation modes—scanning, paper feeding, recording, paper ejecting,
and copying modes.
To switch to a particular mode, the motor rotates in the reverse direction. If the switching arm of the
planet gear ASSY turns on the arm HP switch, the motor further rotates by the specified number of
pulses to locate the planet gear ASSY in the particular mode position. Then the motor rotates in the
forward direction to enter the particular mode.