4.1 Construction ...................................................................................................................................................................4-1

4.1.1 Specifications, Control Methods, and Functions (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022) ...................................... 4-1

4.1.2 Specifications, Control Methods, and Functions (iR2018i/iR2018)............................................................................................ 4-1

4.1.3 Major Components (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022) ................................................................................... 4-2

4.1.4 Major Components (iR2018i/iR2018) ......................................................................................................................................... 4-3

4.1.5 Control System Configuration (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022) .................................................................. 4-3

4.1.6 Control System Configuration (iR2018i/iR2018)........................................................................................................................ 4-4

4.1.7 Reader Controller PCB (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022) ............................................................................. 4-5

4.1.8 Reader Controller PCB (iR2018i/iR2018)................................................................................................................................... 4-5

4.2 Basic Sequence ..............................................................................................................................................................4-6

4.2.1 Basic Sequence at Power-on ........................................................................................................................................................ 4-6

4.2.2 Basic Sequence after Depression of Start Key (Book mode, One Sheet of original) .................................................................. 4-7

4.2.3 Basic Sequence after Depression of Start Key (ADF 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 .....................................................................................................................................................................................4-9

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 (iR2022i/iR2022/iR2018i/iR2018) .................................................................................................4-10

4.3.2.3 Analog Control Performed by the CIS (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022).......................................................................4-11

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 ......................................................................................................................................................................................4-17

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 Procedure after Replacing the Copyboard Glass (Model equipped with ADF)............................................................................................4-18

4.4.1.3 Removing the ADF Reading Glass ...............................................................................................................................................................4-18

4.4.2 Reader Controller PCB .............................................................................................................................................................. 4-18

4.4.2.1 Removing the Reader Controller PCB..........................................................................................................................................................4-18

4.4.3 Scanner Motor............................................................................................................................................................................ 4-20

4.4.3.1 Removing the Scanner Motor .......................................................................................................................................................................4-20

4.4.4 Contact sensor ............................................................................................................................................................................ 4-20

4.4.4.1 Removing the Contact Image Sensor (CIS) ..................................................................................................................................................4-20

4.4.4.2 Procedure after Replacing the CIS(Touch panel type) .................................................................................................................................4-20

4.4.5 Copyboard Cover Open/Close Sensor ....................................................................................................................................... 4-20

4.4.5.1 Removing the Copyboard Cover Open/Close Sensor (Front/Rear) ..............................................................................................................4-20

4.4.6 Contact Sensor HP Sensor ......................................................................................................................................................... 4-21

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