Canon Color imageRUNNER C4580 Service Manual - page 213
Contents
Contents
8.1 Construction ....................................................................................................... 8-1
8.1.1 Specifications, Control Mechanisms, and Functions............................................ 8-1
8.1.2 Major Components..................................................................................................... 8-2
8.1.3 Construction of the Control System ........................................................................ 8-3
8.2 Basic Sequence................................................................................................. 8-4
8.2.1 Basic sequence of operation.................................................................................... 8-4
8.3 Various Control.................................................................................................. 8-5
8.3.1 Controlling the Laser Activation Timing ..................................................................8-5
8.3.1.1 ON/OFF Control.................................................................................................................... 8-5
8.3.1.2 Controlling Synchronization in Main Scanning Direction ............................................... 8-9
8.3.1.3 Controlling Synchronization in Sub Scanning Direction ............................................... 8-10
8.3.2 Controlling the Intensity of Laser Light .................................................................8-10
8.3.2.1 APC Control ........................................................................................................................ 8-10
8.3.2.2 PWM Control ....................................................................................................................... 8-11
8.3.3 Controlling the Laser Scanner Motor ....................................................................8-12
8.3.3.1 Laser scanner motor control ............................................................................................. 8-12
8.3.3.2 Laser Scanner Motor Speed Change Control................................................................ 8-13
8.3.4 Controlling the Laser Shutter .................................................................................8-14
8.3.4.1 Laser shutter control .......................................................................................................... 8-14
8.3.5 Correcting Image Displacement ............................................................................8-15
8.3.5.1 Outline .................................................................................................................................. 8-15
8.3.5.2 Timing of Color Displacement Detection/Correction..................................................... 8-16
8.3.5.3 Detecting/Correcting Color Displacement in Sub Scanning Direction ....................... 8-17
8.3.5.4 Detecting/Correcting the Angle in Main Scanning Direction........................................ 8-18
8.3.5.5 Detecting/Correcting Color Displacement in Main Scanning Direction...................... 8-20
8.3.5.6 Detecting/Correcting Changes in the Reproduction Ratio in Main Scanning Direction 8-
21
8.4 Parts Replacement Procedure...................................................................... 8-23
8.4.1 Laser Unit ..................................................................................................................8-23