Canon LBP3010 Series Service Manual page 23

Contents
2.1 Functional Configuration ...............................................................................................................................................2-1
2.1.1 Outline.......................................................................................................................................................................................... 2-1
2.2 Basic Sequence ..............................................................................................................................................................2-1
2.2.1 Basic Sequence of Operation ....................................................................................................................................................... 2-1
2.2.2 Power-On Sequence..................................................................................................................................................................... 2-1
2.3 LASER EXPOSURE SYSTEM.....................................................................................................................................2-2
2.3.1 Overview/Configuration .............................................................................................................................................................. 2-2
2.3.1.1 Overview .........................................................................................................................................................................................................2-2
2.3.2 Controlling the Laser Activation Timing..................................................................................................................................... 2-3
2.3.2.1 Laser ON/OFF Control ...................................................................................................................................................................................2-3
2.3.2.2 Horizontal Sync Control .................................................................................................................................................................................2-3
2.3.3 Laser Control ............................................................................................................................................................................... 2-4
2.3.3.1 Auto Power Control (APC) .............................................................................................................................................................................2-4
2.3.4 Laser Scanner Motor Control....................................................................................................................................................... 2-4
2.3.4.1 Overview .........................................................................................................................................................................................................2-4
2.3.4.2 Scanner Motor Fault Detection .......................................................................................................................................................................2-5
2.4 IMAGE FORMATION SYSTEM .................................................................................................................................2-6
2.4.1 Overview/Configuration .............................................................................................................................................................. 2-6
2.4.1.1 Overview .........................................................................................................................................................................................................2-6
2.4.1.2 Print Process....................................................................................................................................................................................................2-6
2.4.1.3 Static Latent Image Formation Block .............................................................................................................................................................2-7
2.4.1.4 Development Block.........................................................................................................................................................................................2-8
2.4.1.5 Transfer Block.................................................................................................................................................................................................2-8
2.4.1.6 Fixing Block....................................................................................................................................................................................................2-9
2.4.1.7 Drum Cleaning Block .....................................................................................................................................................................................2-9
2.4.2 High-Voltage Control ................................................................................................................................................................ 2-10
2.4.2.1 Overview .......................................................................................................................................................................................................2-10
2.4.2.2 Generating Primary Charging Bias ...............................................................................................................................................................2-10
2.4.2.3 Generating Developing Bias .........................................................................................................................................................................2-10
2.4.2.4 Generating Transfer Bias ..............................................................................................................................................................................2-11
2.4.3 Toner Cartridge .......................................................................................................................................................................... 2-11
2.4.3.1 Toner Level Detection...................................................................................................................................................................................2-11
2.4.3.2 Toner Cartridge Absence/Presence Detection ..............................................................................................................................................2-11
2.5 PICKUP AND FEEDING SYSTEM ...........................................................................................................................2-12
2.5.1 Overview/Configuration ............................................................................................................................................................ 2-12
2.5.1.1 Overview .......................................................................................................................................................................................................2-12
2.5.2 Detecting Jams ........................................................................................................................................................................... 2-12
2.5.2.1 Jam Detection Outline...................................................................................................................................................................................2-12
2.5.2.1.1 Overview ...............................................................................................................................................................................................2-12
2.5.2.2 Delay Jams ....................................................................................................................................................................................................2-13
2.5.2.2.1 Delivery Delay Jam...............................................................................................................................................................................2-13
2.5.2.3 Stationary Jams .............................................................................................................................................................................................2-13
2.5.2.3.1 Pickup Stationary Jam...........................................................................................................................................................................2-13
2.5.2.3.2 Delivery Stationary Jam ........................................................................................................................................................................2-13
2.5.2.4 Other Jams.....................................................................................................................................................................................................2-13
2.5.2.4.1 Fixing Take-up Jam ..............................................................................................................................................................................2-13
2.5.2.4.2 Remaining Jam at Start-up ....................................................................................................................................................................2-13
2.6 EXTERNAL AND CONTROLS SYSTEM ................................................................................................................2-14
2.6.1 Power Supply ............................................................................................................................................................................. 2-14
2.6.1.1 Power Supply ................................................................................................................................................................................................2-14
2.6.1.1.1 Low voltage power circuit.....................................................................................................................................................................2-14
2.6.1.2 Protective Functions......................................................................................................................................................................................2-15
2.6.1.2.1 Power protective function .....................................................................................................................................................................2-15
Contents