Canon iR5570 Series, Service Manual

Page: 113 / 684

Contents
Contents
4.1 Construction ...................................................................................................................................................................4-1
4.1.1 Construction and Mechanisms ..................................................................................................................................................... 4-1
4.2 Construction of the Electrical Circuitry .........................................................................................................................4-2
4.2.1 Main Controller PCB ................................................................................................................................................................... 4-2
4.2.2 HDD............................................................................................................................................................................................. 4-2
4.3 Start-Up Sequence..........................................................................................................................................................4-5
4.3.1 Overview...................................................................................................................................................................................... 4-5
4.3.2 Start-Up Sequence ....................................................................................................................................................................... 4-5
4.4 Shut-Down Sequence.....................................................................................................................................................4-8
4.4.1 Overview...................................................................................................................................................................................... 4-8
4.4.2 Flow of Operation ........................................................................................................................................................................ 4-8
4.5 Image Processing ...........................................................................................................................................................4-9
4.5.1 Overview of the Image Flow ....................................................................................................................................................... 4-9
4.5.2 Construction of the Image Processing Module............................................................................................................................ 4-9
4.5.3 Reader Unit Input Image Processing ......................................................................................................................................... 4-10
4.5.4 Compression/ Extension/ Editing Block................................................................................................................................... 4-11
4.5.5 Printer unit Output Image Processing ........................................................................................................................................ 4-11
4.6 Flow of Image Data......................................................................................................................................................4-12
4.6.1 Flow of Image Data According to Copy Functions ................................................................................................................... 4-12
4.6.2 Flow of Image Data for the Box Function ................................................................................................................................. 4-12
4.6.3 Flow of Image Data for the SEND Function ............................................................................................................................. 4-13
4.6.4 Flow of Image Data for the Fax Transmission .......................................................................................................................... 4-13
4.6.5 Flow of Image Data for the Fax Reception Function ................................................................................................................ 4-14
4.6.6 Flow of Image Data for the PDL Function ................................................................................................................................ 4-15
4.7 Parts Replacement Procedure.......................................................................................................................................4-16
4.7.1 Main Controller Box .................................................................................................................................................................. 4-16
4.7.1.1 Removing the Rear Cover (upper) ................................................................................................................................................................4-16
4.7.1.2 Removing the Main Controller Box..............................................................................................................................................................4-16
4.7.2 Main Controller PCB ................................................................................................................................................................. 4-17
4.7.2.1 Removing the Main Controller PCB.............................................................................................................................................................4-17
4.7.2.2 After Replacing the Main Controller PCB....................................................................................................................................................4-18
4.7.3 SDRAM ..................................................................................................................................................................................... 4-18
4.7.3.1 Removing the SDRAM .................................................................................................................................................................................4-18
4.7.4 Boot ROM.................................................................................................................................................................................. 4-18
4.7.4.1 Removing the Boot ROM .............................................................................................................................................................................4-18
4.7.5 HDD........................................................................................................................................................................................... 4-19
4.7.5.1 Removing the HDD.......................................................................................................................................................................................4-19
4.7.5.2 After Replacing the HDD..............................................................................................................................................................................4-19
4.7.6 Controller Fan ............................................................................................................................................................................ 4-19
4.7.6.1 Removing the Controller Cooling Fan..........................................................................................................................................................4-19