Canon iR3570 Service Manual page 157

Contents
4.1 Construction ...................................................................................................................................................................4-1
4.1.1 Construction and Mechanisms ..................................................................................................................................................... 4-1
4.1.2 Construction and Functions ......................................................................................................................................................... 4-1
4.2 Construction of the Electrical Circuitry .........................................................................................................................4-2
4.2.1 Main Controller PCB ................................................................................................................................................................... 4-2
4.2.2 Main Controller PCB ................................................................................................................................................................... 4-3
4.2.3 HDD ............................................................................................................................................................................................. 4-4
4.2.4 HDD ............................................................................................................................................................................................. 4-6
4.2.5 HDD (optional) ............................................................................................................................................................................ 4-8
4.3 Start-Up Sequence........................................................................................................................................................4-10
4.3.1 Overview.................................................................................................................................................................................... 4-10
4.3.2 Start-Up Sequence ..................................................................................................................................................................... 4-11
4.4 Shut-Down Sequence ...................................................................................................................................................4-12
4.4.1 Overview.................................................................................................................................................................................... 4-12
4.4.2 Overview (w/ HDD) .................................................................................................................................................................. 4-12
4.4.3 Flow of Operation ...................................................................................................................................................................... 4-12
4.4.4 Flow of Operation (w/ HDD)..................................................................................................................................................... 4-12
4.5 Image Processing .........................................................................................................................................................4-13
4.5.1 Overview of the Image Flow ..................................................................................................................................................... 4-13
4.5.2 Construction of the Image Processing Module .......................................................................................................................... 4-13
4.5.3 Construction of the Image Processing Module .......................................................................................................................... 4-14
4.5.4 Reader Unit Input Image Processing ......................................................................................................................................... 4-14
4.5.5 Compressio/ Extesion/ Editing Block ....................................................................................................................................... 4-15
4.5.6 Compression/Expansion/Edit Block .......................................................................................................................................... 4-15
4.5.7 Printer unit Output Image Processing ........................................................................................................................................ 4-16
4.6 Flow of Image Data......................................................................................................................................................4-16
4.6.1 Flow of Image Data According to Copy Functions ................................................................................................................... 4-16
4.6.2 Flow of Image Data for the Copy Function ............................................................................................................................... 4-17
4.6.3 Flow of Image Data for the Box Function ................................................................................................................................. 4-17
4.6.4 Flow of Image Data for the Box Function ................................................................................................................................. 4-18
4.6.5 Flow of Image Data for the SEND Function ............................................................................................................................. 4-18
4.6.6 Flow of Image Data for the SEND Function ............................................................................................................................. 4-19
4.6.7 Flow of Image Data for the Fax Transmission .......................................................................................................................... 4-19
4.6.8 Flow of Image Data for the Fax Transmission Function ........................................................................................................... 4-20
4.6.9 Flow of Image Data for the Fax Reception Function ................................................................................................................ 4-20
4.6.10 Flow of Image Data for the Fax Reception Function .............................................................................................................. 4-21
4.6.11 Flow of Image Data for the PDL Function .............................................................................................................................. 4-22
4.6.12 Flow of Image Data for the PDL Function .............................................................................................................................. 4-22
4.7 Parts Replacement Procedure.......................................................................................................................................4-22
4.7.1 Main Controller PCB ................................................................................................................................................................. 4-22
4.7.1.1 Removing the Rear Cover .............................................................................................................................................................................4-22
4.7.1.2 Removing the Main Controller PCB.............................................................................................................................................................4-23
4.7.2 SDRAM ..................................................................................................................................................................................... 4-24
4.7.2.1 Removing the Face Cover .............................................................................................................................................................................4-24
4.7.2.2 Removing the SDRAM .................................................................................................................................................................................4-25
4.7.3 Boot ROM.................................................................................................................................................................................. 4-25
4.7.3.1 Removing the Face Cover .............................................................................................................................................................................4-25
4.7.3.2 Removing the Boot ROM .............................................................................................................................................................................4-26
4.7.4 HDD ........................................................................................................................................................................................... 4-26
4.7.4.1 Removing the Face Cover .............................................................................................................................................................................4-26
Contents