4.5.3 Construction of the Image Processing Module ......................................................................................................4- 14

4.5.4 Reader Unit Input Image Processing .....................................................................................................................4- 14

4.5.5 Compressio/ Extesion/ Editing Block ....................................................................................................................4- 15

4.5.6 Compression/Expansion/Edit Block .......................................................................................................................4- 15

4.5.7 Printer unit Output Image Processing ....................................................................................................................4- 16

4.6 Flow of Image Data .................................................................................................................................. 4- 16

4.6.1 Flow of Image Data According to Copy Functions.................................................................................................4- 16

4.6.2 Flow of Image Data for the Copy Function ............................................................................................................4- 17

4.6.3 Flow of Image Data for the Box Function...............................................................................................................4- 17

4.6.4 Flow of Image Data for the Box Function...............................................................................................................4- 18

4.6.5 Flow of Image Data for the SEND Function...........................................................................................................4- 18

4.6.6 Flow of Image Data for the SEND Function...........................................................................................................4- 19

4.6.7 Flow of Image Data for the Fax Transmission .......................................................................................................4- 19

4.6.8 Flow of Image Data for the Fax Transmission Function ........................................................................................4- 20

4.6.9 Flow of Image Data for the Fax Reception Function..............................................................................................4- 20

4.6.10 Flow of Image Data for the Fax Reception Function............................................................................................4- 21

4.6.11 Flow of Image Data for the PDL Function ............................................................................................................4- 22

4.6.12 Flow of Image Data for the PDL Function ............................................................................................................4- 22

4.7 Parts Replacement Procedure ................................................................................................................. 4- 22

4.7.1 Main Controller PCB ..............................................................................................................................................4- 22

4.7.1.1 Removing the Rear Cover ..................................................................................................................................................... 4- 22

4.7.1.2 Removing the Main Controller PCB ....................................................................................................................................... 4- 23

4.7.2 SDRAM ..................................................................................................................................................................4- 24

4.7.2.1 Removing the Face Cover ..................................................................................................................................................... 4- 24

4.7.2.2 Removing the SDRAM........................................................................................................................................................... 4- 25

4.7.3 Boot ROM ..............................................................................................................................................................4- 25

4.7.3.1 Removing the Face Cover ..................................................................................................................................................... 4- 25

4.7.3.2 Removing the Boot ROM ....................................................................................................................................................... 4- 26

4.7.4 HDD .......................................................................................................................................................................4- 26

4.7.4.1 Removing the Face Cover ..................................................................................................................................................... 4- 26

4.7.4.2 Removing the Face Cover (optional) ..................................................................................................................................... 4- 27

4.7.4.3 Removing the Counter PCB................................................................................................................................................... 4- 27

4.7.4.4 Removing the Counter PCB (optional)................................................................................................................................... 4- 28

4.7.4.5 Removing the HDD ................................................................................................................................................................ 4- 28

4.7.4.6 Removing the HDD (optional) ................................................................................................................................................ 4- 28

Chapter 5 Original Exposure System

5.1 Construction ............................................................................................................................................... 5- 1

5.1.1 Specifications, Control Mechanisms, and Functions ...............................................................................................5- 1

5.1.2 Major Components...................................................................................................................................................5- 1

5.1.3 Construction of the Control System .........................................................................................................................5- 2

5.1.4 Reader Controller PCB ............................................................................................................................................5- 3

5.2 Basic Sequence ......................................................................................................................................... 5- 4

5.2.1 Basic Sequence of Operation at Power-On .............................................................................................................5- 4

5.2.2 Basic Sequence of Operation in Response to a Press on the Start Key (book mode; 1 original) ...........................5- 4

5.2.3 Basic Sequence of Operation in Response to a Press on the Start Key (ADF mode; 1 original ) ...........................5- 5

5.3 Various Control........................................................................................................................................... 5- 6

5.3.1 Controlling the Scanner Drive System .....................................................................................................................5- 6

5.3.1.1 Outline...................................................................................................................................................................................... 5- 6

5.3.1.2 Controlling the Reader Motor................................................................................................................................................... 5- 6

5.3.2 Contact Image Sensor (CIS)....................................................................................................................................5- 7

5.3.2.1 Outline...................................................................................................................................................................................... 5- 7

5.3.2.2 Analog Control Inside the Contact Image Sensor.................................................................................................................... 5- 8

5.3.3 Enlargement/Reduction ...........................................................................................................................................5- 9

5.3.3.1 Changing the Magnification in Main Scanning Direction.......................................................................................................... 5- 9

5.3.3.2 Varying the Magnification in Sub Scanning Direction .............................................................................................................. 5- 9

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