Canon iR C3200 Series Service Manual page 13

8.3.1 Controlling the Laser Activation Timing .................................................................................................... 8-5
8.3.1.1 Turning On/Off the Laser .................................................................................................................... 8-5
8.3.1.2 BD Signal ............................................................................................................................................ 8-7
8.3.1.3 Controlling Synchronization in Main Scanning Direction .................................................................. 8-8
8.3.1.4 Controlling Synchronization in Sub Scanning Direction .................................................................... 8-8
8.3.2 Controlling the Intensity of Laser Light ..................................................................................................... 8-9
8.3.2.1 APC Control ........................................................................................................................................ 8-9
8.3.2.2 PWM Control ...................................................................................................................................... 8-9
8.3.3 Controlling the Laser Scanner Motor ....................................................................................................... 8-10
8.3.3.1 Controlling the Laser Scanner Motor ................................................................................................ 8-10
8.3.4 Controlling the Laser Shutter .................................................................................................................... 8-10
8.3.4.1 Controlling the Laser Shutter ............................................................................................................ 8-10
8.3.5 Correcting Image Displacement ................................................................................................................ 8-11
8.3.5.1 Outline ............................................................................................................................................... 8-11
8.3.5.2 Timing of Color Displacement Detection/Correction ....................................................................... 8-12
8.3.5.3 Detecting/Correcting Color Displacement in Sub Scanning Direction ............................................. 8-13
8.3.5.4 Detecting/Correcting the Angle in Main Scanning Direction ........................................................... 8-14
8.3.5.5 Detecting/Correcting Color Displacement in Main Scanning Direction ........................................... 8-16
8.3.5.6 Detecting/Correcting Changes in the Reproduction Ratio in Main Scanning Direction ................... 8-17
8.4 Parts Replacement Procedure .......................................................................................................................... 8-19
8.4.1 Laser Unit .................................................................................................................................................. 8-19
8.4.1.1 Removing the Center Delivery Tray ................................................................................................. 8-19
8.4.1.2 Removing the Laser Unit ................................................................................................................... 8-19
8.4.1.3 After Replacing the Laser Unit .......................................................................................................... 8-20
Chapter 9 Image Formation
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 .................................................................................................................................. 9-6
9.2.1 Image Formation Process (general) ............................................................................................................ 9-6
9.2.2 Image Formation Process (image formation) ............................................................................................. 9-7
9.2.3 Image Formation Process (transfer) ........................................................................................................... 9-7
9.3 Basic Sequence .................................................................................................................................................. 9-8
9.3.1 At Power-On (1) ......................................................................................................................................... 9-8
9.3.2 At Power-On (2) ......................................................................................................................................... 9-8
9.3.3 During Copying/Printing Operations (normal speed) ................................................................................ 9-9
9.3.4 Making Copies/Prints (half speed) ........................................................................................................... 9-10
9.3.5 After Replacing the Drum Unit (D-UNIT) ............................................................................................... 9-10
9.3.6 Printing Originals Containing a Color Page ............................................................................................. 9-11
9.3.7 Driving and Controlling the Image Formation System and the High-Voltage System ............................ 9-11
9.4 Image Stabilization Control ............................................................................................................................. 9-13
9.4.1 Outline of Image Quality Control ............................................................................................................ 9-13
9.4.2 Automatic Image Stabilization Control .................................................................................................... 9-13
9.4.3 ATR Control ............................................................................................................................................. 9-17
9.4.4 Discharge Current Level Control ............................................................................................................. 9-17
9.4.5 ATVC Control (transfer bias level correction) ......................................................................................... 9-18
9.4.6 PASCAL Control (image gradation) ........................................................................................................ 9-18
9.4.7 SALT-Dmax Control (development characteristics correction) .............................................................. 9-19
9.4.8 SALT-Dhalf Control (development characteristics correction) ............................................................... 9-20
9.4.9 Auto Gradation Control ............................................................................................................................ 9-22
9.5 Drum Unit ........................................................................................................................................................ 9-24
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