Canon iR4570 Series, Service Manual

Page: 343 / 876

Chapter 8
8-27
8.4.2 Basic Sequence
0007-7947
iR2270 / iR2870 / iR3570 / iR4570
- Basic Sequence of Operation for Making 3 Prints
F-8-25
8.4.3 Identifying the Paper Size
0007-8700
iR2270 / iR2870 / iR3570 / iR4570
The size of paper inside the cassette is detected by the cassette size dial, and is communicated to the cassette size
detection PCB.
As may as 15 positions may be detected with reference to the combinations of on and off states of the array of 4
actuators mounted to the cassette size detection PCB on the printer side and operating in conjunction with the cassette
size dial.
In the absence of a cassette, all 4 actuators are off, causing the machine to assume there is no cassette.
AB/Inch Switch
The cassette size dial is equipped with a switch operated to change between AB and Inch configurations; the cassette
size detecting switch will detect the configuration as soon as a cassette is fitted in the machine.
Print Start
Cassette 1 pickup motor
(M6)
Cassette 1 pickup
solenoid (SL1)
Cassette 1 retry sensor
(PS10)
Main motor (M2)
Registration sensor
(PS9)
Registration clutch
(CL2)
Fixing motor
(M11)
Fixing/delivery paper
sensor (PS13)
No.1 delivery motor
(M4)
Delivery sensor 1
(PS14)
*1 *3 *2
PRINT
*1 pickup
*3 registration
*2
pre-registration
cassette 1 pickup motor rotation
increased
cassette 1: 3 sheets of paper