Panasonic Facsimile UF-590, Service Manual

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6 System Description
6.1. Mechanical Operation
6.1.1. Transmit Mechanism
The Transmit Mechanism consists of components which feed, scan and eject documents, as well as send
signals. These components and their functions are as follows:
ADF Mechanism
The ADF (Automatic Document Feeder) automatically feeds paper into the unit, and consists of ADF
Roller and Separation Rubber. Each document is placed face-down on the
Printer Cover (106) before
being fed into the unit.
• The
ADF Roller (331) feeds individual pages into the scanning area.
• The Separation Rubber (207) separates documents placed on the ADF, preventing multiple feeding.
LED Array (329)
The UF-590/790 has one LED Array, used as a light source to illuminate the document. The LED Array
turns ON when the Read Point Sensor is activated by the document leading edge.
Transmit Guide Unit
The Transmit Guide Unit is an auxiliary part used for feeding and ejecting documents. It consists of the
Transmit Guide (301), Control Panel Chassis (201), Feed Roller (302), Eject Roller (303), and Eject
Pinch Roller (206) and Feed Pinch Roller (236). This unit also provides the white scanning area and
serves as a base for electronic white reference.
Transmit Mechanism Drive System
This system feeds documents through the transmitting mechanism, and consists of rollers, gears and a
stepper motor.
• The
Transmit Motor (324), a stepper motor, controlled by the CPU, drives the ADF Roller, Feed Roller
and Eject Roller, with the speed based on the density of the picture information.
• The Feed Roller (302) feeds the document to the scanning point.
• The Eject Roller (303) feeds and ejects the document out of the machine.