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Rev. 10/2002

2.2 SCANNING..............................................................................................2-13

2.2.1 OVERVIEW ....................................................................................2-13

2.2.2 SCANNER DRIVE ..........................................................................2-14

2.2.3 ORIGINAL SIZE DETECTION IN BOOK MODE ............................2-15

2.3 IMAGE PROCESSING ............................................................................2-16

2.3.1 OVERVIEW ....................................................................................2-16

2.3.2 SBU ................................................................................................2-17

2.3.3 AUTO IMAGE DENSITY (ADS) ......................................................2-18

2.3.4 IPU (IMAGE PROCESSING UNIT).................................................2-19

Overview.............................................................................................2-19

2.3.5 IMAGE PROCESSING STEPS AND RELATED SP MODES.........2-20

2.3.6 AUTO SHADING ............................................................................2-25

Black Level Correction ........................................................................2-25

White Level Correction........................................................................2-25

2.3.7 BACKGROUND ERASE.................................................................2-26

Background Erase ..............................................................................2-26

2.3.13 INDEPENDENT DOT ERASE ......................................................2-27

2.3.9 FILTERING, MAIN SCAN MAGNIFICATION/REDUCTION ...........2-28

Overview.............................................................................................2-28

Filtering ...............................................................................................2-28

Main Scan Magnification/Reduction....................................................2-29

Sub Scan Magnification ......................................................................2-29

2.3.10 GAMMA (G) CORRECTION.........................................................2-30

2.3.11 GRADATION PROCESSING .......................................................2-30

Three-graduation Processing..............................................................2-30

Four-graduation Processing................................................................2-31

Error Diffusion and Dithering...............................................................2-31

2.3.12 LINE WIDTH CORRECTION........................................................2-31

2.4 LASER EXPOSURE................................................................................2-32

2.4.1 AUTO POWER CONTROL.............................................................2-32

2.4.2 DUAL BEAM WRITING ..................................................................2-33

2.4.3 LASER BEAM PITCH CHANGE MECHANISM

(FOR A292/A293 ONLY) .................................................................2-34

2.4.4 LD SAFETY SWITCHES ................................................................2-35

2.5 DRUM UNIT ............................................................................................2-36

2.5.1 PROCESS CONTROL....................................................................2-36

Overview.............................................................................................2-36

Drum potential sensor calibration .......................................................2-37

VSG adjustment..................................................................................2-37

VG Adjustment....................................................................................2-38

LD power adjustment ..........................................................................2-39

Toner Density Adjustment...................................................................2-39

VREF Update......................................................................................2-40

2.5.2 DRUM UNIT COMPONENTS.........................................................2-41

2.5.3 DRUM CHARGE.............................................................................2-42

Overview.............................................................................................2-42

Charge Corona Wire Cleaning Mechanism.........................................2-43

2.5.4 DRUM CLEANING AND TONER RECYCLING..............................2-44

Overview.............................................................................................2-44

A292/A293/B098