Content
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5.2.3Basic Sequence
of Operation in Response to a Press on the Start Key (ADF mode; 1 original )...............5- 8
5.3 Various Control ...............................................................................................................................................5- 10
5.3.1 Controlling the Scanner Drive System......................................................................................................5- 10
5.3.1.1 Outline ...............................................................................................................................................5- 10
5.3.1.2 Controlling the Reader Motor............................................................................................................5- 10
5.3.2 Contact Image Sensor (CIS)......................................................................................................................5- 12
5.3.2.1 Outline ...............................................................................................................................................5- 12
5.3.2.2 Analog Control Inside the Contact Image Sensor .............................................................................5- 13
5.3.3 Enlargement/Reduction.............................................................................................................................5- 14
5.3.3.1 Changing the Magnification in Main Scanning Direction.................................................................5- 14
5.3.3.2 Varying the Magnification in Sub Scanning Direction .....................................................................5- 14
5.3.4 Detecting the Size of Originals .................................................................................................................5- 16
5.3.4.1 Outline ...............................................................................................................................................5- 16
5.3.4.2 Outline of Size Identification.............................................................................................................5- 17
5.3.5 Dirt Sensor Control ...................................................................................................................................5- 19
5.3.5.1 Outline ...............................................................................................................................................5- 19
5.3.6 Image Processing.......................................................................................................................................5- 22
5.3.6.1 Outline ...............................................................................................................................................5- 22
5.3.6.2 CCD Drive.........................................................................................................................................5- 23
5.3.6.3 Gain Correction and Offset Correction of the CCD Output..............................................................5- 23
5.3.6.4 A/D Conversion of the CCD Output..................................................................................................5- 24
5.3.6.5 Shading Correction (outline) .............................................................................................................5- 24
5.3.6.6 Shading Adjustment...........................................................................................................................5- 24
5.3.6.7 Shading Correction ............................................................................................................................5- 24
5.4 Parts Replacement Procedure ..........................................................................................................................5- 26
5.4.1 Copyboard glass ........................................................................................................................................5- 26
5.4.1.1 Removing the Copyboard Glass ........................................................................................................5- 26
5.4.1.2 Removing the ADF Reading Glass....................................................................................................5- 26
5.4.2 Reader Controller PCB..............................................................................................................................5- 27
5.4.2.1 Before Replacing the Reader Controller PCB ...................................................................................5- 27
5.4.2.2 Removing the Reader Rear Cover .....................................................................................................5- 27
5.4.2.3 Removing the rear cover of the machine...........................................................................................5- 27
5.4.2.4 Removing the flexible cable cover ....................................................................................................5- 28
5.4.2.5 Removing the Copyboard Glass ........................................................................................................5- 28
5.4.2.6 Removing the Reader Controller PCB...............................................................................................5- 29
5.4.2.7 After Replacing the Reader Controller PCB or After Initializing the RAM .....................................5- 31
5.4.3 Scanner Motor...........................................................................................................................................5- 32
5.4.3.1 Removing the Reader Rear Cover .....................................................................................................5- 32
5.4.3.2 Removing the Scanner Motor............................................................................................................5- 32
5.4.4 Contact sensor ...........................................................................................................................................5- 33
5.4.4.1 Removing the Reader Front Cover....................................................................................................5- 33
5.4.4.2 Removing the Reader Rear Cover .....................................................................................................5- 33
5.4.4.3 Removing the Copyboard Glass ........................................................................................................5- 34
5.4.4.4 Removing the Contact Image Sensor (CIS).......................................................................................5- 35
5.4.4.5 After Replacement of the CIS............................................................................................................5- 36
5.4.5 Copyboard Cover Open/Close Sensor.......................................................................................................5- 36
5.4.5.1 Removing the Reader Rear Cover .....................................................................................................5- 36
5.4.5.2 Removing the Copyboard Cover Open/Closed Sensor (front/rear)...................................................5- 37
5.4.6 Contact Sensor HP Sensor.........................................................................................................................5- 37
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