Canon iR3570 Series, Service Manual

Page: 197 / 722

Chapter 5
5-7
F-5-11
<Memo>
The scanning speed of this machine is as follows:
During copying (100%): 236 mm/sec
In SEND mode (600 dpi x 600 dpi):236 mm/sec
a.Forward Movement When Scanning an Image
To scan an image, the machine moves the contact image sensor (CIS) as follows by controlling the following motors:
F-5-12
b.Reverse Movement After Scanning an Image
After scanning an image, the machine moves the contact image sensor (CIS) to shading position at a specific speed (147 mm/sec).
5.3.2 Contact Image Sensor (CIS)
5.3.2.1 Outline
0006-5927
iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The machine uses a contact image sensor (CIS) to expose and read an image, and the image is read on a line-by-line basis.
T-5-4
Item Description
LED serves as the source of light used to expose the original.
Light guide directs the light from LEDs to the entire length of a single image line of the
original.
Rod lens array collects light reflected by the original.
CCD array collects the reflected light coming through the rod lens array.
Reader controller PCB
3.3V +24V
OPT_MCK
CCW
MD_POW
M_ENABLE
RETURN
M_VREF
+5V
J505
B*
B
A
A*
CPU
Motor
driver
1
2
3
4
M501
Start position
Acceleration
Original leading edge
Normal speed
Original
trailing edge
Deceleration
Stop
Shift
speed
Shift distance
[1] [2] [3] [4]
[1] used until the sensor reaches a speed suited to the selected mode.
[2] used as a margin to ensure a stable speed.
[3] used for reading the image at a specific speed.
[4] used for prompt deceleration and suspension once the image end is reached.