Document Feeder System; Overview - Canon imageCLASS MF4890dw Service Manual

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

Document Feeder System

■ Overview

● SADF
The Single-side Auto Document Feeder (SADF) mounted onto this host machine is dedicated
to stream-reading.
1 motor (SADF motor) is engaged in pickup/feeding/delivery.
At the start of copy/fax/scan, the SADF motor is driven by the drive command from the Main
controller 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.
SADF Motor
A0
1
A0*
2
B0
3
B0*
4
J12
Main
Controller
2 Technical Overview > Document Exposure/Feeder System > Document Feeder System > Overview
● DADF
Pickup/Feed/Delivery Operation
The Double-side Auto Document Feeder (DADF) mounted onto this host machine is
dedicated to stream-reading.
1 motor (DADF motor) is engaged in pickup/feeding/delivery.
At the start of copy/fax/scan, the DADF motor is driven by the drive command from the Main
controller 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.
A0
1
A0\
2
B0
3
B\
4
J12
Main
Controller
J8
Operation at duplex reading
F-2-6
• Pickup to Reading of the 1st side
DADF Motor
DADF Solenoid
2-7
F-2-7
F-2-8
2-7