Canon Color iR C3480 Service Manual page 205

Contents
6.1 Construction................................................................................................................................................................... 6-1
6.1.1 Specifications, Control Mechanisms, and Functions ................................................................................................................... 6-1
6.1.2 Overview ...................................................................................................................................................................................... 6-1
6.2 Various Control ............................................................................................................................................................. 6-3
6.2.1 Controlling the Laser Activation Timing ..................................................................................................................................... 6-3
6.2.1.1 Turning On and Off the Laser Light ...............................................................................................................................................................6-3
6.2.1.2 Controlling Synchronization in Main Scanning Direction .............................................................................................................................6-4
6.2.1.3 Controlling Synchronization in Sub Scanning Direction................................................................................................................................6-5
6.2.1.4 BD Correction .................................................................................................................................................................................................6-7
6.2.2 Controlling the Intensity of Laser Light....................................................................................................................................... 6-9
6.2.2.1 APC Control....................................................................................................................................................................................................6-9
6.2.3 Controlling the Laser Scanner Motor......................................................................................................................................... 6-10
6.2.3.1 Controlling the Speed of the Laser Scanner Motor....................................................................................................................................... 6-10
6.3 Parts Replacement Procedure ...................................................................................................................................... 6-12
6.3.1 Laser Scanner Unit ..................................................................................................................................................................... 6-12
6.3.1.1 Before Removing the Laser Scanner Unit .................................................................................................................................................... 6-12
6.3.1.2 Removing the Laser Scanner Unit ................................................................................................................................................................ 6-12
6.3.1.3 After Replacing the Laser Scanner Unit ....................................................................................................................................................... 6-13
Contents