Canon imageRunner 2022, Service Manual

Page: 129 / 418

Contents
Contents
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