Canon iR C3380 series Service Manual page 11

5.3.4.1 Scanning Lamp ...................................................................................................................................................................... 5- 10
5.3.4.2 Overview ................................................................................................................................................................................ 5- 10
5.3.4.3 Activation Control................................................................................................................................................................... 5- 10
5.3.4.4 Error Detection....................................................................................................................................................................... 5- 10
5.3.5 Detecting the Size of Originals .............................................................................................................................. 5- 10
5.3.5.1 Overview ................................................................................................................................................................................ 5- 10
5.3.5.2 Points of Original Size Detection ........................................................................................................................................... 5- 11
5.3.5.3 Overview of Detection Operation ........................................................................................................................................... 5- 11
5.3.6 Dirt Sensor Control ................................................................................................................................................ 5- 13
5.3.6.1 Overview ................................................................................................................................................................................ 5- 13
5.3.7 Image Processing.................................................................................................................................................. 5- 15
5.3.7.1 Overview ................................................................................................................................................................................ 5- 15
5.3.7.2 Driving the CCD ..................................................................................................................................................................... 5- 15
5.3.7.3 Gain Correction and Offset Correction for the CCD Output................................................................................................... 5- 16
5.3.7.4 A/D Conversion of the CCD Output ....................................................................................................................................... 5- 16
5.3.7.5 Shading Correction (outline) .................................................................................................................................................. 5- 16
5.3.7.6 Shading Adjustment............................................................................................................................................................... 5- 16
5.3.7.7 Shading Correction ................................................................................................................................................................ 5- 16
5.4 Parts Replacement Procedure .................................................................................................................5- 17
5.4.1 Copyboard Glass................................................................................................................................................... 5- 17
5.4.1.1 Removing the Copyboard Glass ............................................................................................................................................ 5- 17
5.4.1.2 After Replacing the Copyboard Glass.................................................................................................................................... 5- 17
5.4.1.3 Removing the ADF Reading Glass ........................................................................................................................................ 5- 17
5.4.1.4 After Replacing the ADF Reading Glass................................................................................................................................ 5- 18
5.4.2 Reader Controller PCB.......................................................................................................................................... 5- 18
5.4.2.1 Before Replacing the Reader Controller PCB........................................................................................................................ 5- 18
5.4.2.2 Before Removing the Reader Controller PCB ....................................................................................................................... 5- 18
5.4.2.3 Removing the Reader Controller PCB ................................................................................................................................... 5- 18
5.4.2.4 After Replacing the Reader Controller PCB........................................................................................................................... 5- 19
5.4.3 Inverter PCB .......................................................................................................................................................... 5- 20
5.4.3.1 Before Removing the Inverter PCB........................................................................................................................................ 5- 20
5.4.3.2 Removing the Inverter PCB ................................................................................................................................................... 5- 20
5.4.4 Scanner Motor ....................................................................................................................................................... 5- 21
5.4.4.1 Before Removing the Scanner Motor..................................................................................................................................... 5- 21
5.4.4.2 Removing the Scanner Motor ................................................................................................................................................ 5- 21
5.4.5 Contact Sensor...................................................................................................................................................... 5- 21
5.4.5.1 Before Removing the Contact Image Sensor (CIS) ............................................................................................................... 5- 21
5.4.5.2 Removing the Contact Image Sensor (CIS)........................................................................................................................... 5- 21
5.4.5.3 After Replacing the CIS ......................................................................................................................................................... 5- 22
5.4.6 Original Cover Sensor ........................................................................................................................................... 5- 22
5.4.6.1 Before Removing the Copyboard Cover Open/Closed Sensor (front/rear)............................................................................ 5- 22
5.4.6.2 Removing the Copyboard Cover Open/Closed Sensor (front/rear) ....................................................................................... 5- 22
5.4.7 Contact Sensor HP Sensor ................................................................................................................................... 5- 23
5.4.7.1 Before Removing the Contact Sensor HP Sensor ................................................................................................................. 5- 23
5.4.7.2 Removing the Contract Sensor Home Position Sensor ......................................................................................................... 5- 23
5.4.8 Original Sensor...................................................................................................................................................... 5- 23
5.4.8.1 Before Removing the Original Size Sensor (AB/Inchconfiguration)....................................................................................... 5- 23
5.4.8.2 Removing the Original Size Sensor (AB/Inch-configuration) ................................................................................................. 5- 23
Chapter 6 Laser Exposure
6.1 Construction ...............................................................................................................................................6- 1
6.1.1 Specifications, Control Mechanisms, and Functions ............................................................................................... 6- 1
6.1.2 Overview.................................................................................................................................................................. 6- 1
6.2 Various Control ...........................................................................................................................................6- 3
6.2.1 Controlling the Laser Activation Timing ................................................................................................................... 6- 3
6.2.1.1 Turning On and Off the Laser Light ......................................................................................................................................... 6- 3
6.2.1.2 Controlling Synchronization in Main Scanning Direction ......................................................................................................... 6- 4
6.2.1.3 Controlling Synchronization in Sub Scanning Direction........................................................................................................... 6- 5
6.2.1.4 BD Correction .......................................................................................................................................................................... 6- 7
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