Canon iR2020 Series Service Manual page 10

Contents
4.1.7 Reader Controller PCB (iR2020/iR2020J/iR2020i) ..................................................................................................4- 4
4.1.8 Reader Controller PCB (iR2016/iR2016J/iR2016i) ..................................................................................................4- 5
4.2 Basic Sequence ......................................................................................................................................... 4- 5
4.2.1 Basic Sequence at Power-on...................................................................................................................................4- 5
4.2.2 Basic Sequence after Depression of Start Key (Book mode, One Sheet of original) ..............................................4- 6
4.2.3 Basic Sequence after Depression of Start Key (ADF Mode, One Sheet of Original)...............................................4- 6
4.3 Various Control........................................................................................................................................... 4- 7
4.3.1 Controlling the Scanner Drive System .....................................................................................................................4- 7
4.3.1.1 Outline...................................................................................................................................................................................... 4- 7
4.3.1.2 Reader Motor Control .............................................................................................................................................................. 4- 8
4.3.2 Contact Image Sensor (CIS)....................................................................................................................................4- 8
4.3.2.1 Outline...................................................................................................................................................................................... 4- 8
4.3.2.2 Analog Control Performed by the CIS (iR2020/iR2020J/iR2016/iR2016J) .............................................................................. 4- 9
4.3.2.3 Analog Control Performed by the CIS (iR2020i/iR2016i)....................................................................................................... 4- 10
4.3.3 Enlargement/Reduction .........................................................................................................................................4- 10
4.3.3.1 Magnification Change in Vertical Scan Direction ................................................................................................................... 4- 10
4.3.3.2 Magnification Change in Horizontal Scan Direction............................................................................................................... 4- 10
4.3.4 Detecting the Size of Originals...............................................................................................................................4- 10
4.3.4.1 Outline.................................................................................................................................................................................... 4- 10
4.3.4.2 Outline of Original Size Detection .......................................................................................................................................... 4- 11
4.3.5 Dirt Sensor Control ................................................................................................................................................4- 12
4.3.5.1 Outline.................................................................................................................................................................................... 4- 12
4.3.6 Image Processing ..................................................................................................................................................4- 14
4.3.6.1 Outline.................................................................................................................................................................................... 4- 14
4.3.6.2 CMOS Sensor Drive .............................................................................................................................................................. 4- 15
4.3.6.3 CMOS Sensor Output Gain Correction and Offset Correction............................................................................................... 4- 15
4.3.6.4 CMOS Sensor Output A/D Conversion.................................................................................................................................. 4- 15
4.3.6.5 Shading Correction (Outline) ................................................................................................................................................ 4- 15
4.3.6.6 Shading Adjustment............................................................................................................................................................... 4- 15
4.3.6.7 Shading Correction ................................................................................................................................................................ 4- 16
4.4 Parts Replacement Procedure ................................................................................................................. 4- 17
4.4.1 Copyboard glass ....................................................................................................................................................4- 17
4.4.1.1 Removing the Copyboard glass............................................................................................................................................. 4- 17
4.4.1.2 Procedure after Replacing the Copyboard Glass (iR2020i/iR2016i)...................................................................................... 4- 17
4.4.1.3 Removing the ADF Reading Glass ........................................................................................................................................ 4- 17
4.4.2 Reader Controller PCB ..........................................................................................................................................4- 17
4.4.2.1 Removing the Rear Cover ..................................................................................................................................................... 4- 17
4.4.2.2 Removing the Right Cover (Lower)........................................................................................................................................ 4- 18
4.4.2.3 Removing the Right Cover (Upper)........................................................................................................................................ 4- 18
4.4.2.4 Removing the Left Cover (Rear) ............................................................................................................................................ 4- 18
4.4.2.5 Removing the Reader Rear Cover......................................................................................................................................... 4- 18
4.4.2.6 Removing the Copyboard glass............................................................................................................................................. 4- 19
4.4.2.7 Removing the Reader Controller PCB ................................................................................................................................... 4- 19
4.4.3 Scanner Motor .......................................................................................................................................................4- 20
4.4.3.1 Removing the Rear Cover ..................................................................................................................................................... 4- 20
4.4.3.2 Removing the Right Cover (Lower)........................................................................................................................................ 4- 20
4.4.3.3 Removing the Right Cover (Upper)........................................................................................................................................ 4- 20
4.4.3.4 Removing the Left Cover (Rear) ............................................................................................................................................ 4- 21
4.4.3.5 Removing the Reader Rear Cover......................................................................................................................................... 4- 21
4.4.3.6 Removing the Scanner Motor ................................................................................................................................................ 4- 21
4.4.4 Contact sensor.......................................................................................................................................................4- 21
4.4.4.1 Removing the Rear Cover ..................................................................................................................................................... 4- 21
4.4.4.2 Removing the Right Cover (Lower)........................................................................................................................................ 4- 22
4.4.4.3 Removing the Right Cover (Upper)........................................................................................................................................ 4- 22
4.4.4.4 Removing the Left Cover (Rear) ............................................................................................................................................ 4- 22
4.4.4.5 Removing the Reader Rear Cover......................................................................................................................................... 4- 22
4.4.4.6 Removing the Copyboard glass............................................................................................................................................. 4- 23
4.4.4.7 Removing the Contact Image Sensor (CIS)........................................................................................................................... 4- 23
4.4.4.8 Procedure after Replacing the CIS (iR2020/iR2020J/iR2016/iR2016J)................................................................................. 4- 23
4.4.4.9 Procedure after Replacing the CIS (iR2020i/iR2016i) ........................................................................................................... 4- 24
Download Free Service Manual And Resetter Printer at http://printer1.blogspot.com