Canon iR3570 Series Service Manual Download Page 11

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Contents

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