Canon GP605 Service Manual page 10

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
CHAPTER 4 IMAGE PROCESSING SYSTEM
I. OUTLINE..................................... 4-1
II. ANALOG IMAGE PROCESSING 4-4
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
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COPYRIGHT © 1999 CANON INC.
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
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
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)