Canon iR2016 Series, Service Manual

Page: 148 / 406

Chapter 4
4-8
4.3.1.2 Reader Motor Control
0010-4250
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.
F-4-14
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.
F-4-15
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
0010-4251
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.
T-4-7
Component Function
LED Illuminates the original.
Light guide Illuminates the entire image line with the LED light.
Rod lens array Collects the light reflected by the original.
CMOS sensor array Receives the light that passed through the rod lens array.
Reader controller PCB
3.3V +24V
RTP3APWN
RTP3BPWN
RTP3A
RTP3B
MO_STANDBY
MO_TORQUE
+5V
J409
B*
B
A
A*
IC2
Motor
driver
1
2
3
4
M401
Start
position
Acceleration
Leading edge
of original
Constant speed
Trailing edge
of original Stop
Movement
speed
Movement distance
[1] [2] [3] [4]
[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.
Deceleration