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

4.1.1 Specifications, Control Methods, and Functions (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022N/iR2022) ...................... 4-1

4.1.2 Major Components (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022N/iR2022).................................................................... 4-1

4.1.3 Control System Configuration (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022N/iR2022) .................................................. 4-2

4.1.4 Reader Controller PCB (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022N/iR2022) ............................................................. 4-3

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

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

4.2.2 Basic Sequence after Depression of Start Key (Book mode, One Sheet of original) .................................................................. 4-5

4.2.3 Basic Sequence after Depression of Start Key (ADF Mode, One Sheet of Original) ................................................................. 4-5

4.3 Various Control..............................................................................................................................................................4-6

4.3.1 Controlling the Scanner Drive System ........................................................................................................................................ 4-6

4.3.1.1 Outline.............................................................................................................................................................................................................4-6

4.3.1.2 Reader Motor Control .....................................................................................................................................................................................4-6

4.3.2 Contact Image Sensor (CIS) ........................................................................................................................................................ 4-7

4.3.2.1 Outline.............................................................................................................................................................................................................4-7

4.3.2.2 Analog Control Performed by the CIS (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022K/iR2018i)........................................................4-8

4.3.3 Enlargement/Reduction................................................................................................................................................................ 4-9

4.3.3.1 Magnification Change in Vertical Scan Direction ..........................................................................................................................................4-9

4.3.3.2 Magnification Change in Horizontal Scan Direction......................................................................................................................................4-9

4.3.4 Detecting the Size of Originals .................................................................................................................................................... 4-9

4.3.4.1 Outline.............................................................................................................................................................................................................4-9

4.3.4.2 Outline of Original Size Detection..................................................................................................................................................................4-9

4.3.5 Dirt Sensor Control .................................................................................................................................................................... 4-11

4.3.5.1 Outline...........................................................................................................................................................................................................4-11

4.3.6 Image Processing ....................................................................................................................................................................... 4-13

4.3.6.1 Outline...........................................................................................................................................................................................................4-13

4.3.6.2 CMOS Sensor Drive .....................................................................................................................................................................................4-14

4.3.6.3 CMOS Sensor Output Gain Correction and Offset Correction.....................................................................................................................4-14

4.3.6.4 CMOS Sensor Output A/D Conversion ........................................................................................................................................................4-14

4.3.6.5 Shading Correction (Outline) .......................................................................................................................................................................4-14

4.3.6.6 Shading Adjustment ......................................................................................................................................................................................4-15

4.3.6.7 Shading Correction........................................................................................................................................................................................4-15

4.4 Parts Replacement Procedure.......................................................................................................................................4-16

4.4.1 Copyboard glass......................................................................................................................................................................... 4-16

4.4.1.1 Removing the Copyboard glass ....................................................................................................................................................................4-16

4.4.1.2 Procedure after Replacing the Copyboard Glass (Model equipped with ADF)............................................................................................4-16

4.4.1.3 Removing the ADF Reading Glass ...............................................................................................................................................................4-16

4.4.2 Reader Controller PCB .............................................................................................................................................................. 4-16

4.4.2.1 Removing the Reader Controller PCB..........................................................................................................................................................4-16

4.4.3 Scanner Motor............................................................................................................................................................................ 4-17

4.4.3.1 Removing the Scanner Motor .......................................................................................................................................................................4-17

4.4.4 Contact sensor ............................................................................................................................................................................ 4-18

4.4.4.1 Removing the Contact Image Sensor (CIS) ..................................................................................................................................................4-18

4.4.4.2 Procedure after Replacing the CIS(Touch panel type) .................................................................................................................................4-18

4.4.5 Copyboard Cover Open/Close Sensor ....................................................................................................................................... 4-18

4.4.5.1 Removing the Copyboard Cover Open/Close Sensor (Front/Rear) ..............................................................................................................4-18

4.4.6 Contact Sensor HP Sensor ......................................................................................................................................................... 4-18

4.4.6.1 Removing the Contact Sensor HP Sensor .....................................................................................................................................................4-18

4.4.7 Original Size Sensor .................................................................................................................................................................. 4-19

4.4.7.1 Removing the Original Sensor (Vertical Scan Direction).............................................................................................................................4-19

4.4.7.2 Removing the Original Sensor (Horizontal Scan Direction) ........................................................................................................................4-19

4.4.8 Reader Heater (option)............................................................................................................................................................... 4-20

4.4.8.1 Removing the Reader Heater (Right)............................................................................................................................................................4-20

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