4.3.5.1 Outline.................................................................................................................................................................................... 4- 13

4.3.6 Image Processing ..................................................................................................................................................4- 15

4.3.6.1 Outline.................................................................................................................................................................................... 4- 15

4.3.6.2 CMOS Sensor Drive .............................................................................................................................................................. 4- 16

4.3.6.3 CMOS Sensor Output Gain Correction and Offset Correction............................................................................................... 4- 16

4.3.6.4 CMOS Sensor Output A/D Conversion.................................................................................................................................. 4- 16

4.3.6.5 Shading Correction (Outline) ................................................................................................................................................ 4- 16

4.3.6.6 Shading Adjustment............................................................................................................................................................... 4- 17

4.3.6.7 Shading Correction ................................................................................................................................................................ 4- 17

4.4 Parts Replacement Procedure ................................................................................................................. 4- 18

4.4.1 Copyboard glass ....................................................................................................................................................4- 18

4.4.1.1 Removing the Copyboard glass............................................................................................................................................. 4- 18

4.4.1.2 Procedure after Replacing the Copyboard Glass (Model equipped with ADF)...................................................................... 4- 18

4.4.1.3 Removing the ADF Reading Glass ........................................................................................................................................ 4- 18

4.4.2 Reader Controller PCB ..........................................................................................................................................4- 18

4.4.2.1 Removing the Reader Controller PCB ................................................................................................................................... 4- 18

4.4.3 Scanner Motor .......................................................................................................................................................4- 20

4.4.3.1 Removing the Scanner Motor ................................................................................................................................................ 4- 20

4.4.4 Contact sensor.......................................................................................................................................................4- 20

4.4.4.1 Removing the Contact Image Sensor (CIS)........................................................................................................................... 4- 20

4.4.4.2 Procedure after Replacing the CIS(Touch panel type) .......................................................................................................... 4- 20

4.4.5 Copyboard Cover Open/Close Sensor ..................................................................................................................4- 20

4.4.5.1 Removing the Copyboard Cover Open/Close Sensor (Front/Rear)....................................................................................... 4- 20

4.4.6 Contact Sensor HP Sensor....................................................................................................................................4- 21

4.4.6.1 Removing the Contact Sensor HP Sensor............................................................................................................................. 4- 21

4.4.7 Original Size Sensor ..............................................................................................................................................4- 21

4.4.7.1 Removing the Original Sensor (Vertical Scan Direction) ....................................................................................................... 4- 21

4.4.7.2 Removing the Original Sensor (Horizontal Scan Direction) ................................................................................................... 4- 22

4.4.8 Reader Heater (option) ..........................................................................................................................................4- 22

4.4.8.1 Removing the Reader Heater (Right) .................................................................................................................................... 4- 22

4.4.8.2 Removing the Reader Heater (Left)....................................................................................................................................... 4- 22

Chapter 5 Laser Exposure

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

5.1.1 Overview ..................................................................................................................................................................5- 1

5.1.2 Specifications and Control Mechanism....................................................................................................................5- 1

5.1.3 Main Components....................................................................................................................................................5- 1

5.1.4 Control System Configuration ..................................................................................................................................5- 2

5.2 Various Controls ......................................................................................................................................... 5- 2

5.2.1 Controlling the Laser Activation Timing ...................................................................................................................5- 2

5.2.1.1 Laser Emission ON/OFF Control ............................................................................................................................................. 5- 2

5.2.1.2 Horizontal Synchronization Control.......................................................................................................................................... 5- 3

5.2.2 Controlling the Intensity of Laser Light.....................................................................................................................5- 3

5.2.2.1 Automatic Photocurrent Control (APC) .................................................................................................................................... 5- 3

5.2.3 Controlling the Laser Scanner Motor .......................................................................................................................5- 3

5.2.3.1 Laser Scanner Motor Control................................................................................................................................................... 5- 3

5.2.4 Controlling the Laser Shutter ...................................................................................................................................5- 4

5.2.4.1 Laser Shutter Control............................................................................................................................................................... 5- 4

5.3 Parts Replacement Procedure ................................................................................................................... 5- 6

5.3.1 Laser Scanner Unit ..................................................................................................................................................5- 6

5.3.1.1 Removing the Laser Scanner Unit ........................................................................................................................................... 5- 6

Chapter 6 Image Formation

6.1 Construction ............................................................................................................................................... 6- 1

6.1.1 Specifications of Image Formation System..............................................................................................................6- 1

6.1.2 Major Components of Image Formation System .....................................................................................................6- 1

Table of Contents