Canon imageCLASS MF8450c, Service Manual

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Contents
Chapter 2 Basic Operation
2.1 Construction ..................................................................................................................................................... 2- 1
2.1.1 Functional Configuration ......................................................................................................................... 2- 1
2.1.2 Connecting the Main PCBs .................................................................................................................... 2- 2
2.2 Basic Sequence .............................................................................................................................................. 2- 3
2.2.1 Basic Sequence of Operation ................................................................................................................ 2- 3
2.2.2 Power-On Sequence ............................................................................................................................... 2- 4
Chapter 3 Main Controller
3.1
Overview/Configuration
................................................................................................................................. 3- 1
3.1.1
Overview
................................................................................................................................................... 3- 1
3.1.2 Configurations/functions ......................................................................................................................... 3- 2
3.2
Set-Up Sequence
........................................................................................................................................... 3- 4
3.2.1
Overview
................................................................................................................................................... 3- 4
3.2.2
Startup Sequence
.................................................................................................................................... 3- 5
3.3
Image Processing
........................................................................................................................................... 3- 6
3.3.1
Overview of the Image Flow
.................................................................................................................. 3- 6
3.3.2
Construction of the Image Processing Module
................................................................................... 3- 6
3.3.3
Reader Unit Input Image Processing
.................................................................................................... 3- 7
3.3.4
Compression/ Extesion/ Editing Block
.................................................................................................. 3- 7
3.3.5
Printer unit Output Image Processing
.................................................................................................. 3- 8
3.4
Image Data Flow
............................................................................................................................................. 3- 9
3.4.1
Flow of Image Data According to Copy Functions
............................................................................. 3- 9
3.4.2
Flow of Image Data for the SEND Function
...................................................................................... 3- 10
3.4.3
Flow of Image Data for the Fax Transmission
.................................................................................. 3- 10
3.4.4
Flow of Image Data for the Fax Reception Function
........................................................................ 3- 11
3.4.5
Flow of Image Data for the PDL Function
.......................................................................................... 3- 11
3.5 Parts Replacement Procedure ................................................................................................................... 3- 12
3.5.1 Main Controller PCB .............................................................................................................................. 3- 12
3.5.1.1 Before Removing the Main Controller PCB ................................................................................ 3- 12
3.5.1.2
Removing the Main Controller PCB
............................................................................................. 3- 12
3.5.1.3 Procedure after Replacing the Main Controller PCB ................................................................ 3- 12
Chapter 4 Original Exposure System
4.1 Basic Construction .......................................................................................................................................... 4- 1
4.1.1 Overview ................................................................................................................................................... 4- 1
4.1.2 Major Components .................................................................................................................................. 4- 1
4.2 Basic Sequence .............................................................................................................................................. 4- 3
4.2.1 Basic Sequence of Operation at Power-on ......................................................................................... 4- 3
4.2.2 Basic Sequence of Operation in Response to a Press on the Start Key (book) ........................... 4- 4
4.3 Various Control ............................................................................................................................................... 4- 5
4.3.1 Lamp Control ............................................................................................................................................. 4- 5
4.3.1.1 Overview ............................................................................................................................................ 4- 5
4.3.2 Enlargement/Reduction ........................................................................................................................... 4- 6
4.3.2.1 Overview ............................................................................................................................................ 4- 6
4.3.3 Detecting the Size of Originals ............................................................................................................... 4- 6