Parts Replacement Procedure - Canon iR4570 Series Service Manual

Contents
6.1 Construction ....................................................................................................................................................... 6-1
6.1.1 Specifications, Control Mechanism, and Functions .................................................................................... 6-1
6.1.2 Major Components ...................................................................................................................................... 6-2
6.1.3 Construction of the Control System ............................................................................................................ 6-2
6.2 Basic Sequence................................................................................................................................................... 6-6
6.2.1 Basic Sequence ........................................................................................................................................... 6-6
6.3 Various Controls................................................................................................................................................. 6-7
6.3.1 Controlling the Laser Activation Timing .................................................................................................... 6-7
6.3.1.1 Turning On and off the Laser Light ..................................................................................................... 6-7
6.3.1.2 Main Scanning Synchronous Control................................................................................................... 6-8
6.3.2 Controlling the Intensity of Laser Light...................................................................................................... 6-9
6.3.2.1 APC Control ......................................................................................................................................... 6-9
6.3.3 Controlling the Laser Scanner Motor ........................................................................................................ 6-10
6.3.3.1 Controlling the Laser Scanner Motor ................................................................................................. 6-10
6.3.4 Controlling the Laser Shutter .................................................................................................................... 6-10
6.3.4.1 Controlling the Laser Shutter ............................................................................................................. 6-10

6.4 Parts Replacement Procedure........................................................................................................................... 6-12

6.4.1 Laser Scanner Unit .................................................................................................................................... 6-12
6.4.1.1 Removing the Front Cover Unit ......................................................................................................... 6-12
6.4.1.2 Removing the Left Cover ................................................................................................................... 6-12
6.4.1.3 Removing the Laser Unit.................................................................................................................... 6-13
Contents