Canon iR7086 Series Service Manual

Contents

ContentsContents7.1 Construction ...................................................................................................................................................................7-17.1.1 Outline.......................................................................................................................................................................................... 7-17.1.2 Major Components....................................................................................................................................................................... 7-17.1.3 Pre-Transfer Exposure LED ........................................................................................................................................................ 7-27.2 Image Formation Process...............................................................................................................................................7-27.2.1 Overview...................................................................................................................................................................................... 7-27.3 Basic Sequence ..............................................................................................................................................................7-37.3.1 Basic Sequence ............................................................................................................................................................................ 7-37.4 Potential Control ............................................................................................................................................................7-37.4.1 Outline.......................................................................................................................................................................................... 7-37.4.2 Basics Sequence of Operations .................................................................................................................................................... 7-47.4.3 Determining the Optimum Grid Bias........................................................................................................................................... 7-57.4.4 Grid Bias Corrective Control ....................................................................................................................................................... 7-67.4.5 Determining the Optimum Laser Output ..................................................................................................................................... 7-67.4.6 Laser Output Corrective Control ................................................................................................................................................. 7-77.4.7 Determining the Optimum Developing Bias ............................................................................................................................... 7-77.4.8 Potential Control for Transparency Mode ................................................................................................................................... 7-87.4.9 Target Potential Correction in Each Mode .................................................................................................................................. 7-97.5 Charging Mechanism ...................................................................................................................................................7-117.5.1 Primary Charging Mechanism ................................................................................................................................................... 7-117.5.1.1 Outline...........................................................................................................................................................................................................7-117.5.1.2 Primary Charging Assembly Cleaning Mechanism......................................................................................................................................7-127.5.1.3 Others ............................................................................................................................................................................................................7-137.5.2 Dust-Collecting Roller Bias ....................................................................................................................................................... 7-137.5.2.1 Outline...........................................................................................................................................................................................................7-137.5.3 Pre-Transfer Charging Mechanism............................................................................................................................................ 7-147.5.3.1 Outline...........................................................................................................................................................................................................7-147.5.3.2 Controlling the Output to Suit the Environment (fuzzy control) ..................................................................................................................7-157.5.3.3 Pre-Transfer Charging Assembly Cleaning Mechanism...............................................................................................................................7-167.5.3.4 Others ............................................................................................................................................................................................................7-167.6 Drum Cleaner Unit.......................................................................................................................................................7-177.6.1 Outline........................................................................................................................................................................................ 7-177.6.2 Detecting the Waste Toner (case full condition) ....................................................................................................................... 7-177.7 Developing Assembly ..................................................................................................................................................7-187.7.1 Outline........................................................................................................................................................................................ 7-187.7.2 Controlling the Developing Assembly....................................................................................................................................... 7-197.7.3 Controlling the Toner Cartridge Drive Mechanism................................................................................................................... 7-207.7.4 Controlling the Developing Bias ............................................................................................................................................... 7-217.7.5 Detecting the Toner Level and Controlling the Toner Supply Mechanism............................................................................... 7-227.8 Transfer Mechanism ....................................................................................................................................................7-257.8.1 Transfer Guide Bias ................................................................................................................................................................... 7-257.8.1.1 Overview .......................................................................................................................................................................................................7-257.8.1.2 Controlling the Output to Suit the Environment ...........................................................................................................................................7-267.8.2 Transfer Charging Mechanism .................................................................................................................................................. 7-267.8.2.1 Outline...........................................................................................................................................................................................................7-267.8.2.2 Controlling the Output to Suit the Environment (fuzzy control) ..................................................................................................................7-277.8.2.3 Correcting the Output at the Trailing Edge of Paper ....................................................................................................................................7-287.8.2.4 Transfer Charging Assembly Cleaning Mechanism .....................................................................................................................................7-287.8.2.5 Others ............................................................................................................................................................................................................7-297.9 Separation Mechanism.................................................................................................................................................7-297.9.1 Separation Charging Mechanism ............................................................................................................................................... 7-29