Canon iR4570 Series Service Manual page 9

4.1 Construction ...................................................................................................................................................... 4- 1
4.1.1Construction and Mechanisms .................................................................................................................... 4- 1
4.2 Construction of the Electrical Circuitry ............................................................................................................ 4- 3
4.2.1Main Controller PCB................................................................................................................................... 4- 3
4.2.2HDD ............................................................................................................................................................ 4- 4
4.3 Start-Up Sequence............................................................................................................................................. 4- 7
4.3.1Overview ..................................................................................................................................................... 4- 7
4.3.2Start-Up Sequence ....................................................................................................................................... 4- 7
4.4 Shut-Down Sequence ...................................................................................................................................... 4- 10
4.4.1Overview ................................................................................................................................................... 4- 10
4.4.2Flow of Operation ..................................................................................................................................... 4- 10
4.5 Image Processing............................................................................................................................................. 4- 11
4.5.1Overview of the Image Flow..................................................................................................................... 4- 11
4.5.2Construction of the Image Processing Module ......................................................................................... 4- 11
4.5.3Reader Unit Input Image Processing......................................................................................................... 4- 12
4.5.4Compressio/ Extesion/ Editing Block ...................................................................................................... 4- 13
4.5.5Printer unit Output Image Processing ....................................................................................................... 4- 14
4.6 Flow of Image Data ......................................................................................................................................... 4- 15
4.6.1Flow of Image Data According to Copy Functions .................................................................................. 4- 15
4.6.2Flow of Image Data for the Box Function ................................................................................................ 4- 15
4.6.3Flow of Image Data for the SEND Function............................................................................................. 4- 16
4.6.4Flow of Image Data for the Fax Transmission.......................................................................................... 4- 17
4.6.5Flow of Image Data for the Fax Reception Function ................................................................................ 4- 17
4.6.6Flow of Image Data for the PDL Function................................................................................................ 4- 18
4.7 Parts Replacement Procedure.......................................................................................................................... 4- 20
4.7.1 Main Controller PCB ................................................................................................................................ 4- 20
4.7.1.1 Removing the Rear Cover ................................................................................................................. 4- 20
4.7.1.2 Removing the Main Controller PCB ................................................................................................. 4- 20
4.7.2 SDRAM .................................................................................................................................................... 4- 21
4.7.2.1 Removing the Face Cover ................................................................................................................. 4- 21
4.7.2.2 Removing the SDRAM ..................................................................................................................... 4- 21
4.7.3 Boot ROM................................................................................................................................................. 4- 22
4.7.3.1 Removing the Face Cover ................................................................................................................. 4- 22
4.7.3.2 Removing the Boot ROM.................................................................................................................. 4- 22
4.7.4 HDD .......................................................................................................................................................... 4- 22
4.7.4.1 Removing the Face Cover ................................................................................................................. 4- 22
4.7.4.2 Removing the Counter PCB .............................................................................................................. 4- 23
4.7.4.3 Removing the HDD........................................................................................................................... 4- 23
Chapter 5 Original Exposure System
5.1 Construction ...................................................................................................................................................... 5- 1
5.1.1Specifications, Control Mechanisms, and Functions .................................................................................. 5- 1
5.1.2Major Components ...................................................................................................................................... 5- 2
5.1.3Construction of the Control System ............................................................................................................ 5- 4
5.1.4Reader Controller PCB................................................................................................................................ 5- 5
5.2 Basic Sequence.................................................................................................................................................. 5- 7
5.2.1Basic Sequence of Operation at Power-On ................................................................................................. 5- 7
5.2.2Basic Sequence of Operation in Response to a Press on the Start Key (book mode; 1 original) ............... 5- 7
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