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

7.7.1 Outline ..................................................................................................................................................... 7- 19

7.7.2 Controlling the Developing Assembly................................................................................................. 7- 20

7.7.3 Controlling the Toner Cartridge Drive Mechanism ........................................................................... 7- 21

7.7.4 Controlling the Developing Bias .......................................................................................................... 7- 22

7.7.5 Detecting the Toner Level and Controlling the Toner Supply Mechanism ................................... 7- 23

7.8 Transfer Mechanism..................................................................................................................................... 7- 27

7.8.1 Transfer Guide Bias ............................................................................................................................... 7- 27

7.8.1.1 Overview .......................................................................................................................................... 7- 27

7.8.1.2 Controlling the Output to Suit the Environment ......................................................................... 7- 28

7.8.2 Transfer Charging Mechanism............................................................................................................. 7- 29

Contents

Table of Contents