Basic Sequence Of Operation - Canon iR4570 Series Service Manual

Chapter 8

8.5.2 Basic Sequence of Operation

iR2270 / iR2870 / iR3570 / iR4570
The multi-pickup roller starts to rotate when the manual pickup clutch (CL1) goes on to start upper separation to pick
up a single sheet of paper. When the leading edge of the sheet reaches the registration sensor (PS26) and is moved a
specific distance, the manual pickup clutch goes off, causing the sheet to arch in the registration roller area.
When the registration clutch (CL2) goes on, the manual feed pickup clutch (CL1) once again goes on to pick up
paper. The manual feed pickup clutch (CL1) goes off immediately before the trailing edge of paper moves past the
manual feed pickup roller; thereafter, the registration roller serves to pull off the paper.
Print start
Manual feed pickup
clutch ( L1)
Registration
clutch ( L2)
Registration
sensor (PS26)
F-8-35
8.5.3 Identifying the Paper Size
iR2270 / iR2870 / iR3570 / iR4570
The width of paper is detected with reference to the output of the variable resistor (SVR1), which operates in
conjunction with the movement of the side guide.
The side guide in the manual feed tray is set when the user moves it to place paper in the cassette.
[1] Side guide (rear)
[2] Stop arm
8-42
PRINT LSTR
[1]
[6]
[2]
[3]
[5]
F-8-36
0007-2124
0007-2187
[4]