Canon IR6570 Series Service Manual page 12

Contents
5.4.12.3 Removing the Right Cover (upper) ................................................................................................. 5- 47
5.4.12.4 Removing the Reader Right Cover.................................................................................................. 5- 48
5.4.12.5 Removing the Left Cover (upper).................................................................................................... 5- 48
5.4.12.6 Removing the Reader Left Cover .................................................................................................... 5- 48
5.4.12.7 Removing the Reader Front Cover .................................................................................................. 5- 48
5.4.12.8 Removing the Reader Unit Rear Cover ........................................................................................... 5- 49
5.4.12.9 Removing the ADF.......................................................................................................................... 5- 50
5.4.12.10 Removing the Control Panel.......................................................................................................... 5- 50
5.4.12.11 Removing the Scanner Drive Cable............................................................................................... 5- 51
5.4.12.12 Fitting the Scanner Drive Cable..................................................................................................... 5- 54
5.4.12.13 Adjusting the Position of the No. 1/No. 2 Mirror Base ................................................................. 5- 56
Chapter 6 Laser Exposure
6.1 Construction....................................................................................................................................................... 6- 1
6.1.1Overview...................................................................................................................................................... 6- 1
6.1.2Major Components ...................................................................................................................................... 6- 1
6.2 Basic Sequence .................................................................................................................................................. 6- 3
6.2.1Basic Sequence of Operation (laser exposure) ............................................................................................ 6- 3
6.3 Various Controls................................................................................................................................................ 6- 4
6.3.1 Controlling the Laser Activation Timing .................................................................................................... 6- 4
6.3.1.1 Generating the Sync Signal.................................................................................................................. 6- 4
6.3.1.2 Flow of the Sync Signal....................................................................................................................... 6- 4
6.3.2 Controlling the Intensity of Laser Light...................................................................................................... 6- 5
6.3.2.1 Controlling the Laser Intensity ............................................................................................................ 6- 5
6.3.2.2 APC Control ........................................................................................................................................ 6- 6
6.3.3 Controlling the Laser Scanner Motor.......................................................................................................... 6- 7
6.3.3.1 Controlling the Laser Scanner Motor .................................................................................................. 6- 7
6.4 Parts Replacement Procedure ............................................................................................................................ 6- 9
6.4.1 Laser Scanner Unit ...................................................................................................................................... 6- 9
6.4.1.1 Removing the Laser Scanner Unit ....................................................................................................... 6- 9
6.4.1.2 When Replacing the Scanner Unit....................................................................................................... 6- 9
Chapter 7 Image Formation
7.1 Construction....................................................................................................................................................... 7- 1
7.1.1Overview...................................................................................................................................................... 7- 1
7.1.2Major Components ...................................................................................................................................... 7- 2
7.2 Image Formation Process .................................................................................................................................. 7- 3
7.2.1Overview...................................................................................................................................................... 7- 3
7.3 Basic Sequence .................................................................................................................................................. 7- 4
7.3.1At Power-On ................................................................................................................................................ 7- 4
7.3.2At Time of Printing...................................................................................................................................... 7- 4
7.4 Potential Control................................................................................................................................................ 7- 6
7.4.1Overview...................................................................................................................................................... 7- 6
7.4.2Copier/Printer Potential Control .................................................................................................................. 7- 6
7.4.3Determining the Primary Current .............................................................................................................. 7- 10
7.4.4Determining the Laser Output ................................................................................................................... 7- 10
7.4.5Determining the Developing Bias ............................................................................................................. 7- 11