Canon iR2016 Series, Service Manual

Page: 149 / 406

Chapter 4
4-9
F-4-16
4.3.2.2 Analog Control Performed by the CIS (iR2020/iR2020J/iR2016/iR2016J)
0010-4252
iR2016J / iR2016 / iR2020 /
The flow of analog image processing performed by the contact image sensor (CIS) is as follows:
The light reflected by the original is collected by the rod lens array.
- The light is received by the CMOS sensor array.
- The CMOS sensor array converts the received light to an electric signal and outputs it.
The CMOS sensor array consists of four channels (units).
Each channel is provided with an output correction table to output an image signal after performing gain correction for the input brightness signal.
F-4-17
- After replacing the contact image sensor (CIS), go through the following steps to perform inter-channel output correction:
1) Enter the service mode.
Sequentially press the User Mode key, 2 key, 8 key, and User Mode key on the operation panel.
2) Using the arrow keys on the operation panel, display "TEST MODE".
3) Press the OK key.
4) Press the 2 key. "SCAN TEST" appears.
5) Press the 1 key.
After completion of the above steps, contact sensor output correction will be performed and parameters will be set automatically.
Light guide Light guide
LED
CCD LED
Rod lens array
Light guide
LED (R/G/B)
CMOS
sensor array
Rod lens array
Image read line
Original glass
LED (R/G/B)
Scan direction
Dr
iver circuit
4
CCD channel x 4
3
2
1
1872 pix
els
7488 pix
els