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6.3 Various Control Mechanisms .......................................................................... 6-9
6.3.1 Controlling the Scanner Drive System ....................................................................6-9
6.3.1.1 Overview ................................................................................................................................ 6-9
6.3.1.2 Controlling the Scanner Motor.......................................................................................... 6-10
6.3.2 Enlargement/Reduction ..........................................................................................6-11
6.3.2.1 Changing the Magnification in Main Scanning Direction.............................................. 6-11
6.3.2.2 Changing the Magnification in Sub Scanning Direction ............................................... 6-11
6.3.3 Controlling the Scanning Lamp ..............................................................................6-11
6.3.3.1 Overview .............................................................................................................................. 6-11
6.3.3.2 Scanning Lamp ................................................................................................................... 6-12
6.3.3.3 Turning On and Off the Scanning Lamp......................................................................... 6-12
6.3.4 Detecting the Size of Originals ..............................................................................6-12
6.3.4.1 Identifying the Size of Originals........................................................................................ 6-12
6.3.4.2 Points of Measurement Used for Original Size Identification ...................................... 6-13
6.3.4.3 Overview of Operation ....................................................................................................... 6-15
6.3.5 Dirt Sensor Control ..................................................................................................6-17
6.3.5.1 Stream Reading Dust Detection Control ........................................................................ 6-17
6.3.5.2 White Plate Dust Detection Control ................................................................................. 6-19
6.3.6 Image Processing ....................................................................................................6-21
6.3.6.1 Overview .............................................................................................................................. 6-21
6.3.6.2 CCD Drive............................................................................................................................ 6-22
6.3.6.3 CCD Gain Correction, Offset Correction ........................................................................ 6-22
6.3.6.4 CCD Output A/D Conversion............................................................................................ 6-22
6.3.6.5 Outline of Shading Correction .......................................................................................... 6-22
6.3.6.6 Shading Adjustment ........................................................................................................... 6-23
6.3.6.7 Shading Correction ............................................................................................................ 6-23
6.4 Parts Replacement Procedure...................................................................... 6-24
6.4.1 Copyboard Glass .....................................................................................................6-24
6.4.2 Exposure Lamp ........................................................................................................6-24
6.4.3 Reader Controller PCB ...........................................................................................6-25
6.4.4 Interface PCB ...........................................................................................................6-27
6.4.5 Inverter PCB .............................................................................................................6-28
6.4.6 CCD Unit ...................................................................................................................6-29
6.4.7 Scanner Motor ..........................................................................................................6-30
6.4.8 ADF Open/Close Sensor ........................................................................................6-31
6.4.9 Scanner HP Sensor .................................................................................................6-32
6.4.10 Original Sensor .......................................................................................................6-33
6.4.11 Cooling Fan .............................................................................................................6-33
6.4.12 Scanner Drive Cable .............................................................................................6-34
Chapter 7 Image Processing System
7.1 Digital Image Processing ................................................................................. 7-1
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