Chapter 5
5-15
Service Mode:
COPIER>OPTION>BODY>DST-POS (level 1)
- use it to set an original reading position when the ADF is in use.
COPIER>OPTION>BODY>DFDST-L1 (level 1)
- use it to adjust the dust reading detection level for between sheets.
COPIER>OPTION>BODY>DFDST-L2 (level 1)
- use it to adjust the dust reading detection level for the end of a job.
5.3.7 Image Processing
5.3.7.1 Overview
0013-8593
/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
The image processing system has the following major specifications and functions:
F-5-29
The PCB used by the image processing system has the following functions:
The machine processes images using its reader controller PCB line by line, and the processing consists in the following;
(1) Analog Image Processing
(a) drives the CCD
(b) performs gain correction and offset correction for the CCD output
(c) performs A/D conversion for the CCD output
(2) Digital image Processing
(a) performs shading correction
F-5-30
5.3.7.2 Driving the CCD
0013-8594
/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
The machine's CCD sensor is a linear image sensor that consists of 3 lines (RGB, 1 line each), and it is composed of 7488-pixel photocells. The signals generated
through photo conversion at the light-receiving segment are sent as analog signals according to pixels in the order of G, B, and R.
- CCD
Number of lines: 3 (RGB, 1 line each)
Number of pixels: 7488
Size of pixel: 42.3 um
- Shading Correction
Shading correction; executed for each job
Shading adjustment: executed in service mode
- Reader Controller PCB
drives the CCD, performs analog image processing, performs A/D conversion, performs shading
correction
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
CCD (RGB, 1 line each)
Analog
image signal
Analog
image processing
- gain correction
- offset correction
A/D
conversion
CCD drive control
SCD control
signal
Line correction
data
Digital
image signal
Even-numbered
pixel
Odd-numbered
pixel
Odd-
numbered
pixel
Even-
numbered
pixel
CCD/AP circuit
10
Digital
image signal
8
Reader controller PCB
Contact image sensor (CIS)
Target
value
J203
EEP-ROM
SRAM
CPU
Shading
correction
Summary of Contents for iR C3380 series
Page 1: ...Aug 29 2006 Service Manual iR C3380 2880 Series...
Page 2: ......
Page 6: ......
Page 23: ...Chapter 1 Introduction...
Page 24: ......
Page 26: ......
Page 52: ......
Page 53: ...Chapter 2 Installation...
Page 54: ......
Page 127: ...Chapter 3 Basic Operation...
Page 128: ......
Page 130: ......
Page 136: ......
Page 137: ...Chapter 4 Main Controller...
Page 138: ......
Page 160: ......
Page 161: ...Chapter 5 Original Exposure System...
Page 162: ......
Page 188: ...Chapter 5 5 24 F 5 68 4 Remove the original sensor 2 hook 1 F 5 69...
Page 189: ...Chapter 6 Laser Exposure...
Page 190: ......
Page 192: ......
Page 206: ......
Page 207: ...Chapter 7 Image Formation...
Page 208: ......
Page 256: ......
Page 257: ...Chapter 8 Pickup Feeding System...
Page 258: ......
Page 262: ......
Page 303: ...Chapter 9 Fixing System...
Page 304: ......
Page 306: ......
Page 321: ...Chapter 10 Externals and Controls...
Page 322: ......
Page 326: ......
Page 336: ...Chapter 10 10 10 F 10 10 2 Remove the check mark from SNMP Status Enabled...
Page 337: ...Chapter 10 10 11 F 10 11...
Page 359: ...Chapter 11 MEAP...
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Page 362: ......
Page 401: ...Chapter 12 RDS...
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Page 404: ......
Page 411: ...Chapter 13 Maintenance and Inspection...
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Page 416: ...Chapter 13 13 2 F 13 1 8 9 1 2 3 3 5 6 7 10 11 12 13 14 4...
Page 421: ...Chapter 14 Standards and Adjustments...
Page 422: ......
Page 424: ......
Page 431: ...Chapter 15 Correcting Faulty Images...
Page 432: ......
Page 434: ......
Page 459: ...Chapter 16 Self Diagnosis...
Page 460: ......
Page 462: ......
Page 481: ...Chapter 17 Service Mode...
Page 482: ......
Page 484: ......
Page 571: ...Chapter 18 Upgrading...
Page 572: ......
Page 574: ......
Page 603: ...Chapter 19 Service Tools...
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Page 609: ...Aug 29 2006...
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