Canon iR3570 Series, Service Manual

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Chapter 5
5-13
F-5-24
<Service Mode>
COPIER>OPTION>BODY>DFDST-L1 (level 1)
(used to adjust the dust detection level between sheets)
COPIER>OPTION>BODY>DFDST-L2 (level 1)
(used to adjust the dust detection level at the end of a job)
5.3.6 Image Processing
5.3.6.1 Outline
0006-5930
iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The following shows the major specifications and functions of the machine's image processing system:
T-5-8
F-5-25
The following shows the functions of the PCBs used by the machine's image processing system:
T-5-9
The machine uses the reader controller PCB to process images for every single image line; specific functions are as follows:
1) Analog Image Processing
-CCD drive
-CCD output gain correction, offset correction
-CCD output A/D conversion
2) Digital Image Processing
-shading correction
CCD number of lines: 1
Number of pixels: Total 7488 (Number of effective pixels: 7180)
size of pixel: 32 x 46.9 ym
Shading correction shading correction: executed for each job
shading adjustment: executed at power-on
Reader controller PCB CCD drive, analog image processing, A/D conversion,
shading correction
ADF
reading
glass
Platen roller
0.5mm 0.5mm
A B C
Lens
LED
Contact image sensor
Reader controller PCB
CCD
Analog image
processing block
Digital image
processing block
Shading
processing
Analog
image
processing
A/D
conversion
Contact image
sensor (CIS)
Controller block