Canon iR7086 Series Service Manual page 12

Contents
5.4.11.3 Before Starting the Work...................................................................................................................................................... 5- 34
5.4.11.4 Removing the Scanner Home Position Sensor.................................................................................................................... 5- 34
5.4.12 Cooling Fan..........................................................................................................................................................5- 35
5.4.12.1 Before Starting the Work...................................................................................................................................................... 5- 35
5.4.12.2 Removing the Reader Cooling Fan 1/2................................................................................................................................ 5- 35
5.4.12.3 Before Starting the Work...................................................................................................................................................... 5- 36
5.4.12.4 Removing the Reader Cooling Fan...................................................................................................................................... 5- 36
5.4.13 Scanner Drive Cable ............................................................................................................................................5- 36
5.4.13.1 Before Starting the Work...................................................................................................................................................... 5- 36
5.4.13.2 Before Starting the Work...................................................................................................................................................... 5- 37
5.4.13.3 Removing the Scanner Drive Cable..................................................................................................................................... 5- 39
5.4.13.4 Fitting the Scanner Drive Cable ........................................................................................................................................... 5- 40
5.4.13.5 Adjusting the Position of the No. 1/No. 2 Mirror Base.......................................................................................................... 5- 40
Chapter 6 Laser Exposure
6.1 Construction ............................................................................................................................................... 6- 1
6.1.1 Outline of the Laser Exposure System ....................................................................................................................6- 1
6.2 Basic Sequence ......................................................................................................................................... 6- 3
6.2.1 Basic Sequence of Operations (laser exposure system) .........................................................................................6- 3
6.3 Various Controls ......................................................................................................................................... 6- 3
6.3.1 Controlling the Laser Activation Timing ...................................................................................................................6- 3
6.3.1.1 Turning On and Off the Laser Unit........................................................................................................................................... 6- 3
6.3.1.2 Flow of the BD Signal .............................................................................................................................................................. 6- 3
6.3.2 Controlling the Intensity of Laser Light.....................................................................................................................6- 4
6.3.2.1 APC Control ............................................................................................................................................................................. 6- 4
6.3.3 Controlling the Laser Scanner Motor .......................................................................................................................6- 5
6.3.3.1 Outline...................................................................................................................................................................................... 6- 5
6.3.4 Controlling the Laser Shutter ...................................................................................................................................6- 5
6.3.4.1 Controlling the Laser Shutter ................................................................................................................................................... 6- 5
6.4 Parts Replacement Procedure ................................................................................................................... 6- 7
6.4.1 Laser Scanner Unit ..................................................................................................................................................6- 7
6.4.1.1 Before Starting the Work.......................................................................................................................................................... 6- 7
6.4.1.2 Removing the Laser Scanner Unit ........................................................................................................................................... 6- 7
6.4.1.3 When Replacing the Laser Scanner Unit................................................................................................................................. 6- 7
Chapter 7 Image Formation
7.1 Construction ............................................................................................................................................... 7- 1
7.1.1 Outline......................................................................................................................................................................7- 1
7.1.2 Major Components...................................................................................................................................................7- 1
7.1.3 Pre-Transfer Exposure LED.....................................................................................................................................7- 2
7.2 Image Formation Process .......................................................................................................................... 7- 2
7.2.1 Overview ..................................................................................................................................................................7- 2
7.3 Basic Sequence ......................................................................................................................................... 7- 3
7.3.1 Basic Sequence .......................................................................................................................................................7- 3
7.4 Potential Control ......................................................................................................................................... 7- 3
7.4.1 Outline......................................................................................................................................................................7- 3
7.4.2 Basics Sequence of Operations...............................................................................................................................7- 4
7.4.3 Determining the Optimum Grid Bias ........................................................................................................................7- 5
7.4.4 Grid Bias Corrective Control ....................................................................................................................................7- 6
7.4.5 Determining the Optimum Laser Output ..................................................................................................................7- 6
7.4.6 Laser Output Corrective Control ..............................................................................................................................7- 7
7.4.7 Determining the Optimum Developing Bias .............................................................................................................7- 7
7.4.8 Potential Control for Transparency Mode ................................................................................................................7- 8
7.4.9 Target Potential Correction in Each Mode ...............................................................................................................7- 9
7.5 Charging Mechanism ............................................................................................................................... 7- 11