Canon ir3570, ir4570 Chapter 5 Original Exposure System

Contents
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
fineline6
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