Canon iR3245, Service Manual

Page: 131 / 746

Contents
Contents
4.1 Construction ...................................................................................................................................................................4-1
4.1.1 Construction and Mechanisms ..................................................................................................................................................... 4-1
4.2 Construction of the Electrical Circuitry .........................................................................................................................4-3
4.2.1 Main Controller PCB ................................................................................................................................................................... 4-3
4.2.2 HDD ............................................................................................................................................................................................. 4-4
4.3 Start-Up Sequence..........................................................................................................................................................4-6
4.3.1 Overview...................................................................................................................................................................................... 4-6
4.4 Shut-Down Sequence .....................................................................................................................................................4-7
4.4.1 Overview...................................................................................................................................................................................... 4-7
4.4.2 Flow of Operation ........................................................................................................................................................................ 4-7
4.5 Image Processing ...........................................................................................................................................................4-8
4.5.1 Construction of the Image Processing Module ............................................................................................................................ 4-8
4.5.2 Reader Unit Input Image Processing ........................................................................................................................................... 4-8
4.5.3 Compression/Extension/Editing Block ........................................................................................................................................ 4-9
4.5.4 Printer unit Output Image Processing .......................................................................................................................................... 4-9
4.6 Flow of Image Data......................................................................................................................................................4-10
4.6.1 Flow of Image Data According to Copy Functions ................................................................................................................... 4-10
4.6.2 Flow of Image Data for the Box Function ................................................................................................................................. 4-10
4.6.3 Flow of Image Data for the SEND Function ............................................................................................................................. 4-11
4.6.4 Flow of Image Data for the Fax Transmission .......................................................................................................................... 4-11
4.6.5 Flow of Image Data for the Fax Reception Function ................................................................................................................ 4-12
4.6.6 Flow of Image Data for the PDL Function ................................................................................................................................ 4-12
4.7 Parts Replacement Procedure.......................................................................................................................................4-13
4.7.1 Image PCB ................................................................................................................................................................................. 4-13
4.7.1.1 Removing the Image PCB.............................................................................................................................................................................4-13
4.7.2 Main Controller PCB ................................................................................................................................................................. 4-13
4.7.2.1 Before Removing the Main Controller PCB .................................................................................................................................................4-13
4.7.2.2 Removing the Main Controller PCB.............................................................................................................................................................4-13
4.7.3 SDRAM ..................................................................................................................................................................................... 4-14
4.7.3.1 Removing the SDRAM (for image processing)............................................................................................................................................4-14
4.7.3.2 Removing the SDRAM (for system processing) ..........................................................................................................................................4-15
4.7.4 HDD ........................................................................................................................................................................................... 4-15
4.7.4.1 Removing the HDD.......................................................................................................................................................................................4-15
4.7.5 Wireless LAN PCB.................................................................................................................................................................... 4-15
4.7.5.1 Removing the Wireless LAN PCB ...............................................................................................................................................................4-15
4.7.6 IPSec PCB.................................................................................................................................................................................. 4-16
4.7.6.1 Removing the IPSec PCB .............................................................................................................................................................................4-16
4.7.7 PCI Bus Expansion PCB............................................................................................................................................................ 4-17
4.7.7.1 Before Removing the PCI Bus Expansion PCB ...........................................................................................................................................4-17
4.7.7.2 Removing the PCI Bus Expansion PCB .......................................................................................................................................................4-17
4.7.8 Voice Guidance PCB ................................................................................................................................................................. 4-17
4.7.8.1 Removing the Voice Guidance PCB.............................................................................................................................................................4-17
4.7.9 Voice Operation PCB ................................................................................................................................................................ 4-18
4.7.9.1 Removing the Voice Operation PCB ............................................................................................................................................................4-18
4.7.10 FAX Expansion PCB ............................................................................................................................................................... 4-19
4.7.10.1 Removing the FAX Expansion PCB...........................................................................................................................................................4-19