ContentsContents4.1 Construction ...................................................................................................................................................................4-14.1.1 Specifications, Control Methods, and Functions (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022N/iR2022) ...................... 4-14.1.2 Major Components (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022N/iR2022).................................................................... 4-14.1.3 Control System Configuration (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022N/iR2022) .................................................. 4-24.1.4 Reader Controller PCB (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022N/iR2022) ............................................................. 4-34.2 Basic Sequence ..............................................................................................................................................................4-44.2.1 Basic Sequence at Power-on ........................................................................................................................................................ 4-44.2.2 Basic Sequence after Depression of Start Key (Book mode, One Sheet of original) .................................................................. 4-54.2.3 Basic Sequence after Depression of Start Key (ADF Mode, One Sheet of Original) ................................................................. 4-54.3 Various Control..............................................................................................................................................................4-64.3.1 Controlling the Scanner Drive System ........................................................................................................................................ 4-64.3.1.1 Outline.............................................................................................................................................................................................................4-64.3.1.2 Reader Motor Control .....................................................................................................................................................................................4-64.3.2 Contact Image Sensor (CIS) ........................................................................................................................................................ 4-74.3.2.1 Outline.............................................................................................................................................................................................................4-74.3.2.2 Analog Control Performed by the CIS (iR2030i/iR2030/iR2025i/iR2025/iR2022i/iR2022K/iR2018i)........................................................4-84.3.3 Enlargement/Reduction................................................................................................................................................................ 4-94.3.3.1 Magnification Change in Vertical Scan Direction ..........................................................................................................................................4-94.3.3.2 Magnification Change in Horizontal Scan Direction......................................................................................................................................4-94.3.4 Detecting the Size of Originals .................................................................................................................................................... 4-94.3.4.1 Outline.............................................................................................................................................................................................................4-94.3.4.2 Outline of Original Size Detection..................................................................................................................................................................4-94.3.5 Dirt Sensor Control .................................................................................................................................................................... 4-114.3.5.1 Outline...........................................................................................................................................................................................................4-114.3.6 Image Processing ....................................................................................................................................................................... 4-134.3.6.1 Outline...........................................................................................................................................................................................................4-134.3.6.2 CMOS Sensor Drive .....................................................................................................................................................................................4-144.3.6.3 CMOS Sensor Output Gain Correction and Offset Correction.....................................................................................................................4-144.3.6.4 CMOS Sensor Output A/D Conversion ........................................................................................................................................................4-144.3.6.5 Shading Correction (Outline) .......................................................................................................................................................................4-144.3.6.6 Shading Adjustment ......................................................................................................................................................................................4-154.3.6.7 Shading Correction........................................................................................................................................................................................4-154.4 Parts Replacement Procedure.......................................................................................................................................4-164.4.1 Copyboard glass......................................................................................................................................................................... 4-164.4.1.1 Removing the Copyboard glass ....................................................................................................................................................................4-164.4.1.2 Procedure after Replacing the Copyboard Glass (Model equipped with ADF)............................................................................................4-164.4.1.3 Removing the ADF Reading Glass ...............................................................................................................................................................4-164.4.2 Reader Controller PCB .............................................................................................................................................................. 4-164.4.2.1 Removing the Reader Controller PCB..........................................................................................................................................................4-164.4.3 Scanner Motor............................................................................................................................................................................ 4-174.4.3.1 Removing the Scanner Motor .......................................................................................................................................................................4-174.4.4 Contact sensor............................................................................................................................................................................ 4-184.4.4.1 Removing the Contact Image Sensor (CIS) ..................................................................................................................................................4-184.4.4.2 Procedure after Replacing the CIS(Touch panel type) .................................................................................................................................4-184.4.5 Copyboard Cover Open/Close Sensor ....................................................................................................................................... 4-184.4.5.1 Removing the Copyboard Cover Open/Close Sensor (Front/Rear) ..............................................................................................................4-184.4.6 Contact Sensor HP Sensor ......................................................................................................................................................... 4-184.4.6.1 Removing the Contact Sensor HP Sensor .....................................................................................................................................................4-184.4.7 Original Size Sensor .................................................................................................................................................................. 4-194.4.7.1 Removing the Original Sensor (Vertical Scan Direction).............................................................................................................................4-194.4.7.2 Removing the Original Sensor (Horizontal Scan Direction) ........................................................................................................................4-194.4.8 Reader Heater (option)............................................................................................................................................................... 4-204.4.8.1 Removing the Reader Heater (Right)............................................................................................................................................................4-20