Canon iR2030 Series Service Manual page 9

Chapter 3 Main Controller
3.1 Construction ...............................................................................................................................................3- 1
3.1.1 Construction and Mechanisms ................................................................................................................................ 3- 1
3.2 Construction of the Electrical Circuitry........................................................................................................3- 1
3.2.1 Image Processor PCB ............................................................................................................................................. 3- 1
3.3 Image Processing .......................................................................................................................................3- 2
3.3.1 Overview of the Image Flow .................................................................................................................................... 3- 2
3.3.2 Construction of the Image Processing Module........................................................................................................ 3- 3
3.3.3 Reader Unit Input Image Processing....................................................................................................................... 3- 3
3.3.4 Compressio/ Extesion/ Editing Block...................................................................................................................... 3- 4
3.3.5 Printer unit Output Image Processing...................................................................................................................... 3- 4
3.4 Flow of Image Data ....................................................................................................................................3- 5
3.4.1 Flow of Image Data According to Copy Functions .................................................................................................. 3- 5
3.4.2 Flow of Image Data for the SEND Function ............................................................................................................ 3- 5
3.4.3 Flow of Image Data for the Fax Transmission......................................................................................................... 3- 6
3.4.4 Flow of Image Data for the Fax Reception Function ............................................................................................... 3- 6
3.4.5 Flow of Image Data for the PDL Function ............................................................................................................... 3- 7
3.5 Parts Replacement Procedure ...................................................................................................................3- 8
3.5.1 Main Controller PCB................................................................................................................................................ 3- 8
3.5.1.1 Preparation for Removing the Image Processor PCB ............................................................................................................. 3- 8
3.5.1.2 Removing the Image Processor PCB ...................................................................................................................................... 3- 8
3.5.1.3 Procedure after Replacing the Image Processor PCB........................................................................................................... 3- 10
3.5.2 SDRAM.................................................................................................................................................................. 3- 10
3.5.2.1 Preparation for Removing the SDRAM .................................................................................................................................. 3- 10
3.5.2.2 Removing the SDRAM........................................................................................................................................................... 3- 11
Chapter 4 Original Exposure System
4.1 Construction ...............................................................................................................................................4- 1
4.1.1 Specifications, Control Methods, and Functions (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022) ...................... 4- 1
4.1.2 Specifications, Control Methods, and Functions (iR2018i/iR2018) ......................................................................... 4- 1
4.1.3 Major Components (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022) ................................................................... 4- 2
4.1.4 Major Components (iR2018i/iR2018) ...................................................................................................................... 4- 3
4.1.5 Control System Configuration (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022) .................................................. 4- 3
4.1.6 Control System Configuration (iR2018i/iR2018)...................................................................................................... 4- 4
4.1.7 Reader Controller PCB (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022)............................................................. 4- 5
4.1.8 Reader Controller PCB (iR2018i/iR2018)................................................................................................................ 4- 5
4.2 Basic Sequence..........................................................................................................................................4- 6
4.2.1 Basic Sequence at Power-on .................................................................................................................................. 4- 6
4.2.2 Basic Sequence after Depression of Start Key (Book mode, One Sheet of original) .............................................. 4- 7
4.2.3 Basic Sequence after Depression of Start Key (ADF Mode, One Sheet of Original) .............................................. 4- 7
4.3 Various Control ...........................................................................................................................................4- 8
4.3.1 Controlling the Scanner Drive System..................................................................................................................... 4- 8
4.3.1.1 Outline...................................................................................................................................................................................... 4- 8
4.3.1.2 Reader Motor Control .............................................................................................................................................................. 4- 9
4.3.2 Contact Image Sensor (CIS) ................................................................................................................................... 4- 9
4.3.2.1 Outline...................................................................................................................................................................................... 4- 9
4.3.2.2 Analog Control Performed by the CIS (iR2022i/iR2022/iR2018i/iR2018) .............................................................................. 4- 10
4.3.2.3 Analog Control Performed by the CIS (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022) .................................................... 4- 11
4.3.3 Enlargement/Reduction ......................................................................................................................................... 4- 11
4.3.3.1 Magnification Change in Vertical Scan Direction ................................................................................................................... 4- 11
4.3.3.2 Magnification Change in Horizontal Scan Direction............................................................................................................... 4- 11
4.3.4 Detecting the Size of Originals .............................................................................................................................. 4- 11
4.3.4.1 Outline.................................................................................................................................................................................... 4- 11
4.3.4.2 Outline of Original Size Detection .......................................................................................................................................... 4- 12
4.3.5 Dirt Sensor Control ................................................................................................................................................ 4- 13
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