Reader Motor Control; Contact Image Sensor (Cis); Outline - Canon iR2020 Series Service Manual

Chapter 4

4.3.1.2 Reader Motor Control

iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
The reader motor driver controls rotation/stop and rotational direction/speed of the reader motor based on the signals from IC2.
MEMO:
The scan speed of this machine is as follows:
Copy (100%): 118 mm/sec
Color send (300 dpi x 300 dpi): 28 mm/sec
a. Forward Movement during Image Scan
During image scan, operation of the contact image sensor (CIS) is controlled by controlling the motor as shown below.
b. Backward Movement after Image Scan
After image scan, the carriage moves back to the contact image sensor (CIS) shading position at the constant speed (118 mm/sec).

4.3.2 Contact Image Sensor (CIS)

4.3.2.1 Outline

iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
The original is exposed to light and read using the contact image sensor (CIS) to read the image on a line-by-line basis.
Component
LED
Light guide
Rod lens array
CMOS sensor array
4-8
Reader controller PCB
3.3V
RTP3APWN
RTP3BPWN
RTP3A
IC2
RTP3B
MO_STANDBY
MO_TORQUE
Start
Leading edge
position
of original
Acceleration
Movement
speed
[1] [2]
Movement distance
[1] Acceleration area: The motor accelerates to the speed specified for each mode.
[2] Runup area: A margin to stabilize the speed.
[3] Image read area: The image is read at a constant speed.
[4] Deceleration area: Upon detection of the trailing edge, the motor decelerates rapidly and stops.
Function
Illuminates the original.
Illuminates the entire image line with the LED light.
Collects the light reflected by the original.
Receives the light that passed through the rod lens array.
+5V +24V
J409
B*
1
B
Motor
2
A
driver
3
A*
4
F-4-14
Trailing edge
of original
Constant speed
[3]
F-4-15
T-4-7
M401
Stop
Deceleration
[4]
0010-4250
0010-4251