Contents4.5.3 Construction of the Image Processing Module ......................................................................................................4- 144.5.4 Reader Unit Input Image Processing .....................................................................................................................4- 144.5.5 Compressio/ Extesion/ Editing Block ....................................................................................................................4- 154.5.6 Compression/Expansion/Edit Block .......................................................................................................................4- 154.5.7 Printer unit Output Image Processing ....................................................................................................................4- 164.6 Flow of Image Data .................................................................................................................................. 4- 164.6.1 Flow of Image Data According to Copy Functions.................................................................................................4- 164.6.2 Flow of Image Data for the Copy Function ............................................................................................................4- 174.6.3 Flow of Image Data for the Box Function...............................................................................................................4- 174.6.4 Flow of Image Data for the Box Function...............................................................................................................4- 184.6.5 Flow of Image Data for the SEND Function...........................................................................................................4- 184.6.6 Flow of Image Data for the SEND Function...........................................................................................................4- 194.6.7 Flow of Image Data for the Fax Transmission .......................................................................................................4- 194.6.8 Flow of Image Data for the Fax Transmission Function ........................................................................................4- 204.6.9 Flow of Image Data for the Fax Reception Function..............................................................................................4- 204.6.10 Flow of Image Data for the Fax Reception Function............................................................................................4- 214.6.11 Flow of Image Data for the PDL Function ............................................................................................................4- 224.6.12 Flow of Image Data for the PDL Function ............................................................................................................4- 224.7 Parts Replacement Procedure ................................................................................................................. 4- 224.7.1 Main Controller PCB ..............................................................................................................................................4- 224.7.1.1 Removing the Rear Cover ..................................................................................................................................................... 4- 224.7.1.2 Removing the Main Controller PCB ....................................................................................................................................... 4- 234.7.2 SDRAM ..................................................................................................................................................................4- 244.7.2.1 Removing the Face Cover ..................................................................................................................................................... 4- 244.7.2.2 Removing the SDRAM........................................................................................................................................................... 4- 254.7.3 Boot ROM ..............................................................................................................................................................4- 254.7.3.1 Removing the Face Cover ..................................................................................................................................................... 4- 254.7.3.2 Removing the Boot ROM ....................................................................................................................................................... 4- 264.7.4 HDD .......................................................................................................................................................................4- 264.7.4.1 Removing the Face Cover ..................................................................................................................................................... 4- 264.7.4.2 Removing the Face Cover (optional) ..................................................................................................................................... 4- 274.7.4.3 Removing the Counter PCB................................................................................................................................................... 4- 274.7.4.4 Removing the Counter PCB (optional)................................................................................................................................... 4- 284.7.4.5 Removing the HDD ................................................................................................................................................................ 4- 284.7.4.6 Removing the HDD (optional) ................................................................................................................................................ 4- 28Chapter 5 Original Exposure System5.1 Construction ............................................................................................................................................... 5- 15.1.1 Specifications, Control Mechanisms, and Functions ...............................................................................................5- 15.1.2 Major Components...................................................................................................................................................5- 15.1.3 Construction of the Control System .........................................................................................................................5- 25.1.4 Reader Controller PCB ............................................................................................................................................5- 35.2 Basic Sequence ......................................................................................................................................... 5- 45.2.1 Basic Sequence of Operation at Power-On .............................................................................................................5- 45.2.2 Basic Sequence of Operation in Response to a Press on the Start Key (book mode; 1 original) ...........................5- 45.2.3 Basic Sequence of Operation in Response to a Press on the Start Key (ADF mode; 1 original ) ...........................5- 55.3 Various Control........................................................................................................................................... 5- 65.3.1 Controlling the Scanner Drive System .....................................................................................................................5- 65.3.1.1 Outline...................................................................................................................................................................................... 5- 65.3.1.2 Controlling the Reader Motor................................................................................................................................................... 5- 65.3.2 Contact Image Sensor (CIS)....................................................................................................................................5- 75.3.2.1 Outline...................................................................................................................................................................................... 5- 75.3.2.2 Analog Control Inside the Contact Image Sensor.................................................................................................................... 5- 85.3.3 Enlargement/Reduction ...........................................................................................................................................5- 95.3.3.1 Changing the Magnification in Main Scanning Direction.......................................................................................................... 5- 95.3.3.2 Varying the Magnification in Sub Scanning Direction .............................................................................................................. 5- 9
