Document Feeder System - Canon MF8580Cdw Service Manual

2
Technical Overview > Document Exposure/Feeder System > Document Feeder System > Various Control

Document Feeder System

■ Overview
Pickup/Feed/Delivery Operation
The Auto Document Feeder (ADF) mounted onto this host machine is dedicated to stream-
reading.
1 Motor (ADF Motor: M721) is engaged in Pickup/Feeding/Delivery.
At the start of Copy/Fax/Scan, the ADF Motor (M721) is driven by the drive command from
the Main Controller PCB to Pickup/Feed the originals set face up on the original tray one by
one in order from the top. The original is scanned by the contact sensor when moving through
the copyboard glass, and then delivered face down to the original Delivery Assembly.
A
7
A\
8
M721
B
9
B\
10
J903
MCON
2 Technical Overview > Document Exposure/Feeder System > Document Feeder System > Various Control
■ Various Control
● Original Detection
There are two types of Original Detection in this Equipment.
1. Original Presence / Absence Detection
Setting the original onto the original tray pushes up the actuator, activating (light shielded
=>light transmitted) the Document Sensor (SR703), and resulting in detection of the presence
of original.
2. Detection of the End of the Original
The leading edge of the original that is fed pushes up the actuator, activating the Document
End Sensor (SR702) (light shielded =>light transmitted) and resulting in detection of the reach
of the leading edge of original. Furthermore, when the trailing edge of the original passes
the actuator position, the actuator returns to the original position, inactivating the Document
End Sensor (SR702) (light transmitted => light shielded). The trailing edge of the original is
detected by this mechanism.
The original length that can be scanned with this equipment is less than 400 mm. Passing of
the original longer than this results in jam stop. The original length is calculated by the time it
takes from detection of the leading edge of the original to detection of the trailing edge of the
original.
MEMO:
There is no function to detect the original size (original width, length) in this
equipment.
F-2-7
PS702
1 2 3 4 5
MCON
PS703
J903
6
2-8
F-2-8
2-8