5.3.4 Detecting the Size of Originals ................................................................................................................................ 5- 9

5.3.4.1 Outline...................................................................................................................................................................................... 5- 9

5.3.4.2 Outline of Size Identification .................................................................................................................................................. 5- 10

5.3.5 Dirt Sensor Control ................................................................................................................................................ 5- 11

5.3.5.1 Outline.................................................................................................................................................................................... 5- 11

5.3.6 Image Processing.................................................................................................................................................. 5- 13

5.3.6.1 Outline.................................................................................................................................................................................... 5- 13

5.3.6.2 CCD Drive.............................................................................................................................................................................. 5- 14

5.3.6.3 Gain Correction and Offset Correction of the CCD Output .................................................................................................... 5- 14

5.3.6.4 A/D Conversion of the CCD Output ....................................................................................................................................... 5- 14

5.3.6.5 Shading Correction (outline) .................................................................................................................................................. 5- 14

5.3.6.6 Shading Adjustment............................................................................................................................................................... 5- 14

5.3.6.7 Shading Correction ................................................................................................................................................................ 5- 15

5.4 Parts Replacement Procedure .................................................................................................................5- 15

5.4.1 Copyboard glass.................................................................................................................................................... 5- 15

5.4.1.1 Removing the Copyboard Glass ............................................................................................................................................ 5- 15

5.4.1.2 Removing the ADF Reading Glass ........................................................................................................................................ 5- 15

5.4.2 Reader Controller PCB.......................................................................................................................................... 5- 15

5.4.2.1 Before Replacing the Reader Controller PCB........................................................................................................................ 5- 15

5.4.2.2 Removing the Reader Rear Cover......................................................................................................................................... 5- 16

5.4.2.3 Removing the rear cover of the machine ............................................................................................................................... 5- 16

5.4.2.4 Removing the flexible cable cover ......................................................................................................................................... 5- 16

5.4.2.5 Removing the Copyboard Glass ............................................................................................................................................ 5- 16

5.4.2.6 Removing the Reader Controller PCB ................................................................................................................................... 5- 17

5.4.2.7 After Replacing the Reader Controller PCB or After Initializing the RAM .............................................................................. 5- 18

5.4.3 Scanner Motor ....................................................................................................................................................... 5- 19

5.4.3.1 Removing the Reader Rear Cover......................................................................................................................................... 5- 19

5.4.3.2 Removing the Scanner Motor ................................................................................................................................................ 5- 19

5.4.4 Contact sensor ...................................................................................................................................................... 5- 19

5.4.4.1 Removing the Reader Front Cover ........................................................................................................................................ 5- 19

5.4.4.2 Removing the Reader Rear Cover......................................................................................................................................... 5- 20

5.4.4.3 Removing the Copyboard Glass ............................................................................................................................................ 5- 20

5.4.4.4 Removing the Contact Image Sensor (CIS)........................................................................................................................... 5- 21

5.4.4.5 After Replacement of the CIS ................................................................................................................................................ 5- 21

5.4.5 Copyboard Cover Open/Close Sensor .................................................................................................................. 5- 22

5.4.5.1 Removing the Reader Rear Cover......................................................................................................................................... 5- 22

5.4.5.2 Removing the Copyboard Cover Open/Closed Sensor (front/rear) ....................................................................................... 5- 22

5.4.6 Contact Sensor HP Sensor ................................................................................................................................... 5- 22

5.4.6.1 Removing the Copyboard Glass ............................................................................................................................................ 5- 22

5.4.6.2 Removing the ADF Reading Glass ........................................................................................................................................ 5- 23

5.4.6.3 Removing the Contract Sensor Home Position Sensor ......................................................................................................... 5- 23

5.4.7 Original Size Sensor.............................................................................................................................................. 5- 23

5.4.7.1 Removing the Reader Rear Cover......................................................................................................................................... 5- 23

5.4.7.2 Removing the Copyboard Glass ............................................................................................................................................ 5- 24

5.4.7.3 Removing the Original Size Sensor ....................................................................................................................................... 5- 24

5.4.8 Reader Heater (option).......................................................................................................................................... 5- 25

5.4.8.1 Removing the Copyboard Glass ............................................................................................................................................ 5- 25

5.4.8.2 Removing the Reader Heater (right)...................................................................................................................................... 5- 26

5.4.8.3 Removing the ADF Reading Glass ........................................................................................................................................ 5- 26

5.4.8.4 Removing the Reader Heater (left) ........................................................................................................................................ 5- 26

Chapter 6 Laser Exposure

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

6.1.1 Specifications, Control Mechanism, and Functions................................................................................................. 6- 1

6.1.2 Major Components .................................................................................................................................................. 6- 1

6.1.3 Construction of the Control System......................................................................................................................... 6- 1

6.2 Basic Sequence..........................................................................................................................................6- 3

6.2.1 Basic Sequence ...................................................................................................................................................... 6- 3

Contents

Table of Contents