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COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
vi
A. Outline ................................... 3-8
B. Controlling the Temperature by a
Fluorescent Lamp Heater .... 3-10
C. Controlling Pre-Heat Voltage
............................................ 3-10
D. Initial Activation ................... 3-11
E. Detecting an Error ............... 3-12
IV. DETECTING THE ORIGINAL SIZE
................................................. 3-14
A. Outline ................................. 3-14
B. Detection by Original Sensors
............................................ 3-14
C. Detection by the Feeder ...... 3-14
V. DISASSEMBLY/ASSEMBLY ....3-15
A. No. 1 Mirror Mount .............. 3-16
1. Removing the Scanning
Lamp/Scanning Lamp Heater
....................................... 3-16
2. Points to Note When
Replacing the Scanning Lamp
....................................... 3-19
3. After Replacing the Scanning
Lamp .............................. 3-19
B. Scanner Drive Assembly ..... 3-20
1. Removing the Scanner Motor
....................................... 3-20
2. Scanner Drive Cable ...... 3-21
C. PCBs ................................... 3-28
1. Removing the Light Intensity
Control PCB ................... 3-28
2. Removing the Inverter PCB
....................................... 3-29
D. Others.................................. 3-31
1. Removing the Original Size
Sensor (1/2).................... 3-31
2. Removing the Original Size
Sensor (3/4).................... 3-32
3. Removing the Scanner Home
Position Sensor .............. 3-33
4. Removing the Copyboard
Glass .............................. 3-33
5. Removing the Image Leading
Edge Sensor .................. 3-34
6. Removing the Standard White
Plate ............................... 3-35
7. After Replacing the Standard
White Plate .....................3-36
CHAPTER 4 IMAGE PROCESSING SYSTEM
I. OUTLINE .................................... 4-1
II. ANALOG IMAGE PROCESSING4-4
A. Outline ................................... 4-4
III. DIGITAL IMAGE PROCESSING 4-6
A. Outline ................................... 4-6
B. Image Procesing Functional
Block...................................... 4-7
C. Shading Correction................ 4-9
D. Line Conversion .................. 4-10
E. Editing ................................. 4-11
F. Density Processing.............. 4-12
1. Outline ............................4-12
2. Density Adjustment during
Printing ........................... 4-14
G. Binary Processing ............... 4-15
1. Dither Screen Method .... 4-15
2. Random Error Diffusion (R-
ED) Method ....................4-16
H. Image Memory .................... 4-17
I. Detecting the Orientation of
Originals .............................. 4-19
J. Black Pixel Count ................ 4-20
IV. DISASSEMBLY/ASSEMBLY.... 4-21
A. CCD PCB ............................ 4-22
1. Removing the CCD PCB
....................................... 4-22
2. After Replacing the CCD Unit
....................................... 4-23
B. Image Processor PCB ......... 4-24
1. Removing the Image
Processor PCB ............... 4-24
2. After Replacing the Image
Processor PCB ............... 4-25
C. Hard Disk (image server)..... 4-26
1. Removing the Hard Disk
(image server) ................ 4-26
2. After Replacing the Hard Disk
(image server) ................ 4-26
D. Others.................................. 4-27
1. Removing the System
Motherboard ................... 4-27
2. Removing the Memory Board
....................................... 4-28
3. Removing the Various Printer
Boards ............................ 4-28
4. Removing the Original
Detection PCB ................ 4-29