Canon LBP3300 Series, Service Manual

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Contents
Contents
2.1 Functional Configuration ...............................................................................................................................................2-1
2.1.1 Outline.......................................................................................................................................................................................... 2-1
2.2 Basic Sequense...............................................................................................................................................................2-1
2.2.1 Basic Operation Sequence ........................................................................................................................................................... 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 Outline.............................................................................................................................................................................................................2-2
2.3.1.2 Laser Control Circuit.......................................................................................................................................................................................2-3
2.3.2 Controlling the Laser Activation Timing..................................................................................................................................... 2-5
2.3.2.1 Laser emission control ....................................................................................................................................................................................2-5
2.3.2.2 Horizontal synchronous control ......................................................................................................................................................................2-5
2.3.3 Laser Control ............................................................................................................................................................................... 2-5
2.3.3.1 Automatic power control (APC) .....................................................................................................................................................................2-5
2.3.3.2 Image masking control....................................................................................................................................................................................2-5
2.3.4 Laser Scanner Motor Control....................................................................................................................................................... 2-6
2.3.4.1 Outline.............................................................................................................................................................................................................2-6
2.3.4.2 Scanner motor speed control...........................................................................................................................................................................2-7
2.3.4.3 Scanner motor failure detection ......................................................................................................................................................................2-7
2.4 IMAGE FORMATION SYSTEM .................................................................................................................................2-7
2.4.1 Overview/Configuration .............................................................................................................................................................. 2-7
2.4.1.1 Outline.............................................................................................................................................................................................................2-7
2.4.1.2 Print Process....................................................................................................................................................................................................2-8
2.4.1.3 Electrostatic latent image formation block .....................................................................................................................................................2-8
2.4.1.4 Development block .........................................................................................................................................................................................2-9
2.4.1.5 Transfer block ...............................................................................................................................................................................................2-10
2.4.1.6 Fixing block ..................................................................................................................................................................................................2-11
2.4.1.7 Photosensitive drum cleaning block..............................................................................................................................................................2-11
2.4.2 High-Voltage Control ................................................................................................................................................................ 2-11
2.4.2.1 Outline...........................................................................................................................................................................................................2-11
2.4.2.2 Primary charging bias generation..................................................................................................................................................................2-12
2.4.2.3 Developing bias generation...........................................................................................................................................................................2-12
2.4.2.4 Transfer charging bias generation.................................................................................................................................................................2-12
2.4.2.5 Fixing bias generation ...................................................................................................................................................................................2-13
2.4.2.6 Cartridge presence detection .........................................................................................................................................................................2-13
2.5 PICKUP AND FEEDING SYSTEM...........................................................................................................................2-13
2.5.1 Overview/Configuration ............................................................................................................................................................ 2-13
2.5.1.1 Outline...........................................................................................................................................................................................................2-13
2.5.2 Detecting Jams ........................................................................................................................................................................... 2-14
2.5.2.1 Jam Detection Outline...................................................................................................................................................................................2-14
2.5.2.1.1 Outline...................................................................................................................................................................................................2-14
2.5.2.2 Delay Jams ....................................................................................................................................................................................................2-15
2.5.2.2.1 Pick-up delay jam..................................................................................................................................................................................2-15
2.5.2.2.2 Delivery delay jam ................................................................................................................................................................................2-15
2.5.2.2.3 Reversing delay jam..............................................................................................................................................................................2-15
2.5.2.3 Stationary Jams .............................................................................................................................................................................................2-15
2.5.2.3.1 Pick-up stationary jam...........................................................................................................................................................................2-15
2.5.2.3.2 Delivery stationary jam .........................................................................................................................................................................2-15
2.5.2.3.3 Reversing stationary jam.......................................................................................................................................................................2-15
2.5.2.4 Other Jams.....................................................................................................................................................................................................2-15
2.5.2.4.1 Wrapping jam........................................................................................................................................................................................2-15
2.5.2.4.2 Start-up residual jam .............................................................................................................................................................................2-15
2.5.2.4.3 Door open jam.......................................................................................................................................................................................2-15