Canon iR2422 series Service Manual page 9

mode)........................................................................................................................................................................... 4- 1
4.1.3 Major Components (When the original size detection sensor is equipped for BOOK mode) .................................. 4- 2
4.1.4 Major Components (When the original size detection sensor is not equipped for BOOK mode) ............................ 4- 3
4.1.5 Control System Configuration (When the original size detection sensor is equipped for BOOK mode) ................. 4- 3
4.1.6 Control System Configuration (When the original size detection sensor is not equipped for BOOK mode) ........... 4- 4
4.1.7 Reader Controller PCB (When the original size detection sensor is equipped for BOOK mode)............................ 4- 5
4.1.8 Reader Controller PCB (When the original size detection sensor is not equipped for BOOK mode)...................... 4- 5
4.2 Basic Sequence..........................................................................................................................................4- 7
4.2.1 Basic Sequence at Power-on .................................................................................................................................. 4- 7
4.2.2 Basic Sequence after Depression of Start Key (Book mode, One Sheet of original) .............................................. 4- 7
4.3 Various Control ...........................................................................................................................................4- 8
4.3.1 Controlling the Scanner Drive System..................................................................................................................... 4- 8
4.3.1.1 Outline...................................................................................................................................................................................... 4- 8
4.3.1.2 Reader Motor Control .............................................................................................................................................................. 4- 8
4.3.2 Contact Image Sensor (CIS) ................................................................................................................................... 4- 9
4.3.2.1 Outline...................................................................................................................................................................................... 4- 9
4.3.2.2 Analog Control Performed by the CIS.................................................................................................................................... 4- 10
4.3.3 Enlargement/Reduction ......................................................................................................................................... 4- 11
4.3.3.1 Magnification Change in Vertical Scan Direction ................................................................................................................... 4- 11
4.3.3.2 Magnification Change in Horizontal Scan Direction............................................................................................................... 4- 11
4.3.4 Detecting the Size of Originals .............................................................................................................................. 4- 11
4.3.4.1 Outline.................................................................................................................................................................................... 4- 11
4.3.4.2 Outline of Original Size Detection .......................................................................................................................................... 4- 12
4.3.5 Dirt Sensor Control ................................................................................................................................................ 4- 13
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- 16
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 Removing the ADF Reading Glass (only for ADF equipment) ............................................................................................... 4- 18
4.4.2 Reader Controller PCB.......................................................................................................................................... 4- 18
4.4.2.1 Removing the Reader Controller PCB (When the original size detection sensor is not equipped for BOOK mode) ............. 4- 18
4.4.2.2 Removing the Reader Controller PCB (When the original size detection sensor is equipped for BOOK mode) ................... 4- 20
4.4.3 Scanner Motor ....................................................................................................................................................... 4- 21
4.4.3.1 Removing the Scanner Motor ................................................................................................................................................ 4- 21
4.4.4 Contact sensor ...................................................................................................................................................... 4- 22
4.4.4.1 Removing the Contact Image Sensor (CIS)........................................................................................................................... 4- 22
4.4.4.2 Procedure after Replacing the CIS ........................................................................................................................................ 4- 22
4.4.5 Copyboard Cover Open/Close Sensor .................................................................................................................. 4- 22
4.4.5.1 Removing the Copyboard Cover Open/Close Sensor (Front/Rear)....................................................................................... 4- 22
4.4.6 Contact Sensor HP Sensor ................................................................................................................................... 4- 23
4.4.6.1 Removing the Contact Sensor HP Sensor (When the ADF is not installed) .......................................................................... 4- 23
4.4.6.2 Removing the Contact Sensor HP Sensor (When the ADF is installed)................................................................................ 4- 23
4.4.7 Original Size Sensor.............................................................................................................................................. 4- 23
4.4.7.1 Removing the Original Sensor (Vertical Scan Direction) (When the original size detection sensor is equipped for BOOK mode)
4- 23
4.4.7.2 Removing the Original Sensor (Horizontal Scan Direction) (When the original size detection sensor is equipped for BOOK mode)
4- 24
4.4.8 Reader Heater (option).......................................................................................................................................... 4- 25
4.4.8.1 Removing the Reader Heater (Right) .................................................................................................................................... 4- 25
4.4.8.2 Removing the Reader Heater (Left) (When the ADF is not installed) .................................................................................... 4- 25
4.4.8.3 Removing the Reader Heater (Left) (When the ADF is installed) .......................................................................................... 4- 26
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