Contents
5.1 Construction ...................................................................................................................................................................5-1
5.1.1 Specifications, Control Mechanisms, and Functions ................................................................................................................... 5-1
5.1.2 Major Components....................................................................................................................................................................... 5-1
5.1.4 Reader Controller PCB ................................................................................................................................................................ 5-3
5.2 Basic Sequence ..............................................................................................................................................................5-4
5.3 Various Control Mechanisms.........................................................................................................................................5-6
5.3.1.1 Overview .........................................................................................................................................................................................................5-6
5.3.1.2 Reader Motor Control .....................................................................................................................................................................................5-6
5.3.2 Contact Image Sensor (CIS) ........................................................................................................................................................ 5-8
5.3.2.1 Overview .........................................................................................................................................................................................................5-8
5.3.3 Enlargement/Reduction................................................................................................................................................................ 5-9
5.3.4 Controlling the Scanning Lamp ................................................................................................................................................. 5-10
5.3.4.1 Scanning Lamp..............................................................................................................................................................................................5-10
5.3.4.2 Overview .......................................................................................................................................................................................................5-10
5.3.4.3 Activation Control.........................................................................................................................................................................................5-10
5.3.4.4 Error Detection..............................................................................................................................................................................................5-10
5.3.5 Detecting the Size of Originals .................................................................................................................................................. 5-10
5.3.5.1 Overview .......................................................................................................................................................................................................5-10
5.3.5.2 Points of Original Size Detection..................................................................................................................................................................5-11
5.3.5.3 Overview of Detection Operation .................................................................................................................................................................5-11
5.3.6 Dirt Sensor Control .................................................................................................................................................................... 5-13
5.3.6.1 Overview .......................................................................................................................................................................................................5-13
5.3.7 Image Processing ....................................................................................................................................................................... 5-15
5.3.7.1 Overview .......................................................................................................................................................................................................5-15
5.3.7.2 Driving the CCD ...........................................................................................................................................................................................5-15
5.3.7.4 A/D Conversion of the CCD Output.............................................................................................................................................................5-16
5.3.7.5 Shading Correction (outline).........................................................................................................................................................................5-16
5.3.7.6 Shading Adjustment ......................................................................................................................................................................................5-16
5.3.7.7 Shading Correction........................................................................................................................................................................................5-16
5.4 Parts Replacement Procedure.......................................................................................................................................5-17
5.4.1 Copyboard Glass ........................................................................................................................................................................ 5-17
5.4.1.1 Removing the Copyboard Glass....................................................................................................................................................................5-17
5.4.1.3 Removing the ADF Reading Glass ...............................................................................................................................................................5-17
5.4.1.4 After Replacing the ADF Reading Glass ......................................................................................................................................................5-18
5.4.2 Reader Controller PCB .............................................................................................................................................................. 5-18
5.4.2.3 Removing the Reader Controller PCB..........................................................................................................................................................5-18
5.4.3 Inverter PCB .............................................................................................................................................................................. 5-20
5.4.3.1 Before Removing the Inverter PCB ..............................................................................................................................................................5-20
5.4.3.2 Removing the Inverter PCB ..........................................................................................................................................................................5-20
5.4.4 Scanner Motor............................................................................................................................................................................ 5-21
Contents