vii
6.5.11 LINE WIDTH CORRECTION........................................................6-32
6.5.12 FILTERING...................................................................................6-33
Interactive SP Codes ..........................................................................6-33
Text Mode MTF Filter..........................................................................6-38
Text/Photo, Photo Mode Filter ............................................................6-39
Pale, Generation Mode Filter ..............................................................6-40
Photo Mode Smoothing for Dithering ..................................................6-41
Photo Mode Grayscale .......................................................................6-41
Photo Mode Image Quality .................................................................6-42
6.5.13 OTHERS.......................................................................................6-43
Vertical Black Line Correction.............................................................6-43
Density Settings..................................................................................6-43
ADS Level...........................................................................................6-44
6.5.14 PRACTICAL APPLICATION OF SP MODES ...............................6-45
Solving Problems................................................................................6-45
Recommended Settings for MTF Filters .............................................6-46
6.6 LASER EXPOSURE................................................................................6-48
6.6.1 OVERVIEW ....................................................................................6-48
6.6.2 AUTO POWER CONTROL (APC) ..................................................6-49
6.6.3 DUAL BEAM WRITING ..................................................................6-50
6.6.4 LASER BEAM PITCH CHANGE MECHANISM..............................6-51
6.6.5 LD SAFETY SWITCHES ................................................................6-52
6.7 PHOTOCONDUCTOR UNIT (PCU) ........................................................6-53
6.7.1 OVERVIEW ....................................................................................6-53
6.7.2 DRUM CLEANING..........................................................................6-54
6.7.3 DRIVE MECHANISM......................................................................6-55
6.7.4 DRUM PAWLS ...............................................................................6-55
6.7.5 DRUM TONER SEALS...................................................................6-55
6.8 DRUM CHARGE .....................................................................................6-56
6.8.1 OVERVIEW ....................................................................................6-56
6.8.2 CHARGE ROLLER VOLTAGE CORRECTION ..............................6-57
Correction for Environmental Conditions ............................................6-57
6.8.3 CORRECTION FOR PAPER WIDTH AND THICKNESS ...............6-58
6.8.4 ID SENSOR PATTERN PRODUCTION TIMING............................6-59
6.8.5 DRUM CHARGE ROLLER CLEANING ..........................................6-59
6.9 DEVELOPMENT .....................................................................................6-60
6.9.1 OVERVIEW ....................................................................................6-60
6.9.2 DRIVE MECHANISM......................................................................6-61
6.9.3 DEVELOPER MIXING ....................................................................6-61
6.9.4 DEVELOPMENT BIAS ...................................................................6-62
Mechanism .........................................................................................6-62
Correction for paper width and thickness (by-pass tray only) .............6-62
6.9.5 TONER SUPPLY ............................................................................6-63
Toner bottle replenishment mechanism ..............................................6-63
Toner supply mechanism....................................................................6-64
Toner Scatter Prevention ....................................................................6-65
Sensor Control Mode ..........................................................................6-66
Image Pixel Count Mode.....................................................................6-67
6.9.6 TONER NEAR END/END DETECTION .........................................6-67
