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2.3.1 OVERVIEW ................................................................................... 2-22

2.3.2 OPTICAL PATH ............................................................................. 2-23

2.3.3 AUTO POWER CONTROL (APS) ................................................. 2-24

2.3.4 DUAL BEAM WRITING.................................................................. 2-25

2.3.5 LASER BEAM PITCH CHANGE MECHANISM ............................. 2-26

2.3.6 LD SAFETY SWITCHES ............................................................... 2-27

2.4 PHOTOCONDUCTOR UNIT (PCU)........................................................ 2-28

2.4.1 OVERVIEW ................................................................................... 2-28

2.4.2 DRIVE MECHANISM ..................................................................... 2-29

2.5 DRUM CHARGE..................................................................................... 2-30

2.5.1 OVERVIEW ................................................................................... 2-30

2.5.2 CHARGE ROLLER VOLTAGE CORRECTION ............................. 2-31

Correction for environmental conditions............................................. 2-31

Correction for paper width and thickness (bypass tray only) .............. 2-32

2.5.3 ID SENSOR PATTERN PRODUCTION TIMING ........................... 2-33

2.5.4 DRUM CHARGE ROLLER CLEANING ......................................... 2-33

2.6 DEVELOPMENT..................................................................................... 2-34

2.6.1 OVERVIEW ................................................................................... 2-34

2.6.2 DRIVE MECHANISM ..................................................................... 2-35

2.6.3 DEVELOPER MIXING ................................................................... 2-36

2.6.4 DEVELOPMENT BIAS................................................................... 2-37

Correction for paper width and thickness (bypass tray only) .............. 2-37

2.6.5 TONER SUPPLY ........................................................................... 2-38

Toner bottle replenishment mechanism ............................................. 2-38

Toner supply mechanism ................................................................... 2-39

2.6.6 TONER DENSITY CONTROL ....................................................... 2-40

Overview ............................................................................................ 2-40

Toner density control flow chart ......................................................... 2-40

Sensor control mode .......................................................................... 2-41

Image Pixel Count Control Mode. ...................................................... 2-42

2.6.7 TONER NEAR END/END DETECTION......................................... 2-43

Toner near end/end detection flow chart............................................ 2-43

2.6.8 TONER END RECOVERY............................................................. 2-45

Toner end recovery flow chart............................................................ 2-45

2.6.9 TONER SUPPLY IN ABNORMAL SENSOR CONDITIONS .......... 2-46

2.7 DRUM CLEANING AND TONER RECYCLING...................................... 2-47

2.7.1 DRUM CLEANING......................................................................... 2-47

2.7.2 TONER RECYCLING .................................................................... 2-48

2.8 PAPER FEED ......................................................................................... 2-49

2.8.1 OVERVIEW ................................................................................... 2-49

2.8.2 PAPER FEED DRIVE MECHANISM ............................................. 2-50

2.8.3 PICK-UP AND SEPARATION ROLLER RELEASE MECHANISM 2-51

2.8.4 PAPER LIFT MECHANISM............................................................ 2-52

2.8.5 PAPER END DETECTION............................................................. 2-54

2.8.6 PAPER REGISTRATION............................................................... 2-55

2.8.7 PAPER FEED AND JAM TIMING .................................................. 2-56

2.9 IMAGE TRANSFER AND PAPER SEPARATION .................................. 2-57

2.9.1 OVERVIEW ................................................................................... 2-57

2.9.2 BELT DRIVE MECHANISM ........................................................... 2-58

A230/A231/A232