Canon Color imageRUNNER C4580 Service Manual - page 10
Contents
7.1.1 Overview..................................................................................................................... 7-1
7.1.2 Shading Correction ................................................................................................... 7-1
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
9.1 Construction........................................................................................................ 9-1
9.1.1 Specifications, Control Mechanisms, and Functions........................................... 9-1
9.1.2 Major Components of the Image Formation System........................................... 9-3
9.1.3 Charging Specifications ........................................................................................... 9-4
9.2 Image Formation Process ................................................................................ 9-7
9.2.1 Image Formation Process (general)....................................................................... 9-7