Canon iR C6800 Series Service Manual page 237

Contents
6.1 Construction ....................................................................................................................................................... 6 1
6.1.1 Specifications, Control Mechanisms, and Functions .................................................................................. 6 1
6.1.2 Major Components ...................................................................................................................................... 6 2
6.1.3 Construction of the Control System ............................................................................................................ 6 3
6.2 Basic Sequence................................................................................................................................................... 6 4
6.2.1 Basic Sequence of Operation ...................................................................................................................... 6 4
6.3 Various Control .................................................................................................................................................. 6 5
6.3.1 Controlling the Laser Activation Timing .................................................................................................... 6 5
6.3.1.1 Turning On and Off the Laser Unit ...................................................................................................... 6 5
6.3.1.2 Controlling the Synchronization in Main Scanning Direction ............................................................. 6 6
6.3.1.3 Controlling the Synchronization in Sub Scanning Direction ............................................................... 6 7
6.3.2 Controlling the Intensity of Laser Light...................................................................................................... 6 8
6.3.2.1 APC Control ......................................................................................................................................... 6 8
6.3.2.2 PWM Control ....................................................................................................................................... 6 8
6.3.3 Controlling the Laser Scanner Motor .......................................................................................................... 6 9
6.3.3.1 Controlling the Laser Scanner Motor ................................................................................................... 6 9
6.3.4 Controlling the Laser Shutter .................................................................................................................... 6 10
6.3.4.1 Controlling the Laser Shutter ............................................................................................................. 6 10
6.4 Parts Replacement Procedure........................................................................................................................... 6 11
6.4.1 Laser Scanner Unit .................................................................................................................................... 6 11
6.4.1.1 Removing the Left Cover (upper) ...................................................................................................... 6 11
6.4.1.2 Removing the Delivery Cover............................................................................................................ 6 11
6.4.1.3 Removing the Left Cover (middle) .................................................................................................... 6 11
6.4.1.4 Removing the HV2 PCB .................................................................................................................... 6 11
6.4.1.5 Removing the Laser Scanner Unit...................................................................................................... 6 12
6.4.1.6 Points to Note When Replacing the Laser Scanner Unit.................................................................... 6 13
6.4.1.7 Cleaning the Laser Scanner Unit........................................................................................................ 6 13
Contents