Panasonic UF 885 - Panafax B/W Laser, Service Manual

Page: 192 / 342

System Description
192
ADF Mechanism
The ADF (Automatic Document Feeder) automatically feeds paper into the unit, and consists of the Pre-Feed Roller, ADF Roller
and Separation Rubber. Each document is placed face-down on the Paper Guide Cover before being fed into the unit.
• The Pre-Feed Roller (325) moves the bottom document to the ADF Roller.
• The ADF Roller (323) feeds individual pages into the scanning area.
• The Separation Rubber (229) separates documents placed on the Paper Guide Cover, preventing multiple feeding.
LED Array Assembly
The UF-895 has two LED Arrays (UF-885 has one LED Array), used as a light source to illuminate the document. The LED
Array(s) 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 Control Panel Chassis
(216), Transmitter Chassis (301), Feed Roller (328), Eject Roller (330), and Pinch Roller (218). 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 (346), a stepper motor, controlled by the CPU, drives the Pre-Feed Roller, ADF Roller, Feed Roller and
Eject Roller, with the speed based on the density of the picture information.
• The Feed Roller (328) feeds the document to the scanning point.
• The Eject Roller (330) feeds and ejects the document out of the machine.
Transmit Mechanism Sensors [SNS PCB (121)]
The SNS Assembly (121) performs two functions. The ADF Sensor (PC3), activated by Actuator A (120), detects the presence
of documents on the ADF Tray and multiple pages. The WID (A4/B4 size document width) Sensor (PC1), activated by Actuator
D (134), detects documents that are wider than 9.1 inches (232 mm). The size of the reproduced copy is reduced when the
receiver is capable of printing only letter and A4 size. The size remains the same when the receiver is capable of printing B4
size copies. Width reduction is also in effect in the copy mode.
The RP (Read Point) Sensor (PC2), activated by Actuator B (119), detects the lead and trail edges of the document, controlling
the reading position. The CPU determines that a document is jammed if Actuator B is not tripped within a specified time after the
ADF Roller starts feeding, and disengages the Pre-Feed and ADF Rollers by reversing the Transmit Motor direction.
The ADF Door Sensor (PC1), activated by Actuator C (118), halts all scanning operations when the Control Panel Unit is open.
Verification Stamp Unit
The Verification Stamp Unit stamps an “X” mark on the front of the document after the document is successfully transmitted or
stored. It consists of the Stamp Holder (334) and Stamp Solenoid (335).
Scanner Assembly (340)
The Scanner Assembly consists of two mirrors, a Lens, and a CCD PC Board Assembly (342).
• The mirrors, Mirror 1 (337) and Mirror 2 (338) reflect image information, in the form of light, through the Lens.
• The Lens focuses the image information and passes it to the CCD.
• The CCD, mounted on the CCD PC Board, converts the image information into an electronic signal.