Canon imageRUNNER 7095 Service Manual page 9

6.3 Various Controls ............................................................................................................................................. 6- 3
6.3.1 Controlling the Laser Activation Timing ................................................................................................ 6- 3
6.3.1.1 Turning On and Off the Laser Unit................................................................................................. 6- 3
6.3.1.2 Flow of the BD Signal....................................................................................................................... 6- 4
6.3.2 Controlling the Intensity of Laser Light ................................................................................................. 6- 5
6.3.2.1 APC Control....................................................................................................................................... 6- 5
6.3.3 Controlling the Laser Scanner Motor .................................................................................................... 6- 6
6.3.3.1 Outline ................................................................................................................................................ 6- 6
6.3.4 Controlling the Laser Shutter.................................................................................................................. 6- 7
6.3.4.1 Controlling the Laser Shutter .......................................................................................................... 6- 7
6.4 Parts Replacement Procedure ..................................................................................................................... 6- 8
6.4.1 Laser Scanner Unit .................................................................................................................................. 6- 8
Chapter 7 Image Formation
7.1 Construction..................................................................................................................................................... 7- 1
7.1.1 Outline ....................................................................................................................................................... 7- 1
7.1.2 Major Components .................................................................................................................................. 7- 1
7.1.3 Pre-Transfer Exposure LED................................................................................................................... 7- 2
7.2 Image Formation Process ............................................................................................................................. 7- 2
7.2.1 Overview ................................................................................................................................................... 7- 2
7.3 Basic Sequence .............................................................................................................................................. 7- 3
7.3.1 Basic Sequence ....................................................................................................................................... 7- 3
7.4 Potential Control ............................................................................................................................................. 7- 4
7.4.1 Outline ....................................................................................................................................................... 7- 4
7.4.2 Basics Sequence of Operations ............................................................................................................ 7- 5
7.4.3 Determining the Optimum Grid Bias..................................................................................................... 7- 6
7.4.4 Grid Bias Corrective Control .................................................................................................................. 7- 6
7.4.5 Determining the Optimum Laser Output .............................................................................................. 7- 7
7.4.6 Laser Output Corrective Control............................................................................................................ 7- 7
7.4.7 Determining the Optimum Developing Bias ........................................................................................ 7- 8
7.4.8 Potential Control for Transparency Mode ............................................................................................ 7- 9
7.4.9 Target Potential Correction in Each Mode......................................................................................... 7- 10
7.5 Charging Mechanism ................................................................................................................................... 7- 12
7.5.1 Primary Charging Mechanism .............................................................................................................. 7- 12
7.5.1.1 Outline .............................................................................................................................................. 7- 12
7.5.1.2 Primary Charging Assembly Cleaning Mechanism ................................................................... 7- 13
7.5.1.3 Others ............................................................................................................................................... 7- 13
7.5.2 Dust-Collecting Roller Bias ................................................................................................................... 7- 14
7.5.2.1 Outline .............................................................................................................................................. 7- 14
7.5.3 Pre-Transfer Charging Mechanism ..................................................................................................... 7- 15
7.5.3.1 Outline .............................................................................................................................................. 7- 15
7.5.3.2 Controlling the Output to Suit the Environment (fuzzy control) ............................................... 7- 16
7.5.3.3 Pre-Transfer Charging Assembly Cleaning Mechanism .......................................................... 7- 16
7.5.3.4 Others ............................................................................................................................................... 7- 17
7.6 Drum Cleaner Unit ........................................................................................................................................ 7- 17
7.6.1 Outline ..................................................................................................................................................... 7- 17
7.6.2 Detecting the Waste Toner (case full condition)............................................................................... 7- 18
7.7 Developing Assembly................................................................................................................................... 7- 19
Contents