Service manual

Chapter 4
4-12
T-4-6
F-4-25
Functions of the image processing system are summarized below.
T-4-7
The reader controller PCB is used to process images on a line-by-line basis. Its major functions are as follows:
1)Analog image processing
- CMOS sensor drive
- CMOS sensor output gain correction and offset correction
- CMOS sensor output A/D conversion
2)Digital image processing
- Shading correction
F-4-26
4.3.6.2 CMOS Sensor Drive
0010-4259
iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
The CMOS sensor used in this machine is a 1-line linear image sensor consisting of 7488 photocells. After completion of photoelectric conversion in the light-
receiving block, the signals are output to the AP circuit in the reader controller PCB in parallel for each channel (total eight channels) of the CMOS sensor array.
F-4-27
- CMOS sensor Number of lines: 1
Number of pixels: Total 7488 (incl. 7176 effective pixels)
Pixel size: 32 x 46.9 um
- Shading correction Shading correction: Made for each job.
Shading adjustment: Made in the Service mode.
- Reader controller PCB CMOS sensor drive, analog image processing, A/D
conversion, and shading correction
Reader controller PCB
CMOS
sensor
Analog image processor
Digital image processor
Shading
processing
Analog
image
processing
A/D
conversion
Contact image
sensor (CIS)
Controller
Target
value
CMOS sensor (1 line)
Analog image signal
Analog image
processing
- Gain correction
- Offset correction
A/D
conversion
CMOS sensor
drive control
CMOS sensor
control signal
Gain
correction
data
Digital
image
signal
IC1
10
Digital image
signal
8
Reader controller PCB
Contact image sensor (CIS)
J309
RAM
Shading correction
IC2
Serial
communication
I/F
CMOS sensor 1CMOS sensor 4 CMOS sensor 3
HL L HH L HL H H L
output
Light receiving block