Overview - Canon iR7086 Series Service Manual

Chapter 5
CCD
[4] [3]
CCD/AP PCB
[1] 1st half even-numbered pixel analog image signal
[2] 1st half odd-numbered pixel analog image signal
[3] 2nd half even-numbered pixel analog image signal
[4] 2nd half odd-numbered pixel analog image signal
[5] 1st half digital image signal
[6] 2nd half digital image signal
2. Digital Image Processing
- shading correction
[1] 1st-half digital image signal
[2] 2nd-half digital image signal

5.3.6.2 Overview

iR7086
The PCBs used in the image processing system have the following functions:
CDD/AP PCB: CCD drive, analog image processing, A/D conversion
Reader controller PCB: shading correction
Analog image processing block
1. Analog Image processing
- CCD drive
- CCD output gain correction, offset correction
- CCD output A/D conversion
5-20
[2] [1]
Analog
CCD drive
image
control
signal
Analog image
[1]
process
- gain correction
[2]
- offset correction
Analog image
[3]
process
- gain correction
[4]
- offset correction
J102 J208
Gain correction data
CCD/AP
PCB
J101 J204
[1]
20bit
[2]
20bit
CCD
A/D
Analog image
conversion
processing
CCD/AP PCB
J102
CCD control
signal
Gain correction
data
J101
A/D
[5]
conversion
[6]
A/D
conversion
A12V
A5V
F-5-46
Reader controller PCB
EEP-ROM
Target
CPU
value
Shading correction
F-5-47
Digital image processing block
Reader controller
PCB
Shading processing
F-5-48
J208
Gain correction
data
J204
20bit
20bit
SRAM
J202
[1]
8bit
[2]
8bit
Controller
block
0011-2248