Canon iR4570 Series Service Manual page 11

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
5.4.6.1 Removing the Copyboard Glass........................................................................................................ 5- 37
5.4.6.2 Removing the ADF Reading Glass ................................................................................................... 5- 38
5.4.6.3 Removing the Contract Sensor Home Position Sensor ..................................................................... 5- 39
5.4.7 Original Size Sensor ................................................................................................................................. 5- 39
5.4.7.1 Removing the Reader Rear Cover..................................................................................................... 5- 39
5.4.7.2 Removing the Copyboard Glass........................................................................................................ 5- 40
5.4.7.3 Removing the Original Size Sensor .................................................................................................. 5- 41
5.4.8 Reader Heater (option).............................................................................................................................. 5- 42
5.4.8.1 Removing the Copyboard Glass........................................................................................................ 5- 42
5.4.8.2 Removing the Reader Heater (right) ................................................................................................. 5- 43
5.4.8.3 Removing the ADF Reading Glass ................................................................................................... 5- 43
5.4.8.4 Removing the Reader Heater (left).................................................................................................... 5- 44
Chapter 6 Laser Exposure
6.1 Construction ...................................................................................................................................................... 6- 1
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