Contents
4.7.2 Main Controller PCB..............................................................................................................................................4- 13
4.7.2.1 Before Removing the Main Controller PCB ...........................................................................................................................4- 13
4.7.2.2 Removing the Main Controller PCB.......................................................................................................................................4- 13
4.7.2.3 When Replacing the Main Controller PCB............................................................................................................................. 4- 14
4.7.3 SDRAM..................................................................................................................................................................4- 14
4.7.3.1 Before Removing the SDRAM ............................................................................................................................................... 4- 14
4.7.3.2 Removing the SDRAM........................................................................................................................................................... 4- 14
4.7.4 Boot ROM..............................................................................................................................................................4- 14
4.7.4.1 Before Removing the Boot ROM ...........................................................................................................................................4- 14
4.7.4.2 Removing the Boot ROM.......................................................................................................................................................4- 14
4.7.5 HDD.......................................................................................................................................................................4- 15
4.7.5.1 Before Removing HDD ..........................................................................................................................................................4- 15
4.7.5.2 Removing the HDD................................................................................................................................................................4- 15
4.7.5.3 After Replacing the HDD........................................................................................................................................................4- 15
4.7.6 Video PCB .............................................................................................................................................................4- 15
4.7.6.1 Before Removing the Video PCB...........................................................................................................................................4- 15
4.7.6.2 Removing the Video PCB ...................................................................................................................................................... 4- 15
4.7.7 Controller Fan........................................................................................................................................................4- 16
4.7.7.1 Before Removing the Controller Cooling Fan........................................................................................................................ 4- 16
4.7.7.2 Removing the Controller Cooling Fan.................................................................................................................................... 4- 16
Chapter 5 Original Exposure System
5.1 Construction ...............................................................................................................................................5- 1
5.1.1 Specifications, Controls, and Functions...................................................................................................................5- 1
5.1.2 Major Components...................................................................................................................................................5- 1
5.1.3 Construction of the Control System.........................................................................................................................5- 2
5.1.4 Reader Controller PCB............................................................................................................................................5- 3
5.2 Basic Sequence .........................................................................................................................................5- 4
5.2.1 Basic Sequence of Operations ................................................................................................................................5- 4
5.2.2 Basic Sequence of Operation in Response to a Press on the Start Key.................................................................5- 5
5.3 Various Control...........................................................................................................................................5- 5
5.3.1 Controlling the Scanner Drive System.....................................................................................................................5- 5
5.3.1.1 Overview.................................................................................................................................................................................. 5- 5
5.3.1.2 Controlling the Scanner Motor ................................................................................................................................................. 5- 6
5.3.2 Enlargement/Reduction ...........................................................................................................................................5- 7
5.3.2.1 Changing the Magnification in Main Scanning Direction.......................................................................................................... 5- 7
5.3.2.2 Changing the Magnification in Sub Scanning Direction...........................................................................................................5- 7
5.3.3 Controlling the Scanning Lamp................................................................................................................................5- 8
5.3.3.1 Overview.................................................................................................................................................................................. 5- 8
5.3.3.2 Scanning Lamp........................................................................................................................................................................ 5- 8
5.3.3.3 Controlling the Activation......................................................................................................................................................... 5- 9
5.3.4 Detecting the Size of Originals.................................................................................................................................5- 9
5.3.4.1 Overview.................................................................................................................................................................................. 5- 9
5.3.4.2 Points of Measurement Used for Original Size Identification...................................................................................................5- 9
5.3.4.3 Overview of Operation ........................................................................................................................................................... 5- 10
5.3.5 Dirt Sensor Control ................................................................................................................................................5- 12
5.3.5.1 Dust Detection in Stream Reading Mode............................................................................................................................... 5- 12
5.3.5.2 White Plate Dust Detection Control ....................................................................................................................................... 5- 13
5.3.6 Image Processing..................................................................................................................................................5- 14
5.3.6.1 Overview................................................................................................................................................................................ 5- 14
5.3.6.2 CCD Drive.............................................................................................................................................................................. 5- 15
5.3.6.3 CCD Output Gain Correction, Offset Correction....................................................................................................................5- 15
5.3.6.4 CCD Output A/D Conversion.................................................................................................................................................5- 15
5.3.6.5 Outline of Shading Correction................................................................................................................................................ 5- 15
5.3.6.6 Shading Adjustment............................................................................................................................................................... 5- 16
5.3.6.7 Shading Correction................................................................................................................................................................5- 16
5.4 Parts Replacement Procedure .................................................................................................................5- 17
5.4.1 CCD Unit................................................................................................................................................................5- 17