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6.3 PRINTING PROCESS OVERVIEW...........................................................6-8
Drum Charge ........................................................................................6-8
Laser Exposure.....................................................................................6-8
Development.........................................................................................6-8
Image Transfer .....................................................................................6-9
Separation ............................................................................................6-9
ID Sensor..............................................................................................6-9
Cleaning................................................................................................6-9
Quenching ............................................................................................6-9
6.4 LASER EXPOSURE................................................................................6-10
6.4.1 OVERVIEW ....................................................................................6-10
6.4.2 AUTO POWER CONTROL (APC) ..................................................6-11
6.4.3 DUAL BEAM WRITING ..................................................................6-12
6.4.4 LASER BEAM PITCH CHANGE MECHANISM..............................6-13
6.4.5 LD SAFETY SWITCHES ................................................................6-14
6.5 PHOTOCONDUCTOR UNIT (PCU) ........................................................6-15
6.5.1 OVERVIEW ....................................................................................6-15
6.5.2 DRIVE MECHANISM......................................................................6-16
6.5.3 DRUM PAWLS ...............................................................................6-16
6.5.4 DRUM TONER SEALS...................................................................6-16
6.6 DRUM CHARGE .....................................................................................6-17
6.6.1 OVERVIEW ....................................................................................6-17
6.6.2 CHARGE ROLLER VOLTAGE CORRECTION ..............................6-18
Correction for Environmental Conditions ............................................6-18
6.6.3 ID SENSOR PATTERN PRODUCTION TIMING............................6-20
6.6.4 DRUM CHARGE ROLLER CLEANING ..........................................6-21
6.7 DEVELOPMENT .....................................................................................6-22
6.7.1 OVERVIEW ....................................................................................6-22
DRIVE MECHANISM ..........................................................................6-23
6.7.3 DEVELOPER MIXING ....................................................................6-23
6.7.4 DEVELOPMENT BIAS ...................................................................6-24
Mechanism .........................................................................................6-24
6.7.5 TONER SUPPLY ............................................................................6-25
Toner Bottle Replenishment Mechanism ............................................6-25
Toner Supply Mechanism ...................................................................6-26
Toner Density Control .........................................................................6-26
Sensor Control Mode ..........................................................................6-27
Image Pixel Count Mode.....................................................................6-27
6.7.6 TONER NEAR END/END DETECTION .........................................6-28
Standard Method ................................................................................6-28
Adjustable Near-end Warning Method ................................................6-28
6.7.7 TONER END RECOVERY .............................................................6-29
6.7.8 TONER SUPPLY WITH ABNORMAL SENSORS ..........................6-29
6.8 DRUM CLEANING AND TONER RECYCLING.......................................6-30
6.8.1 DRUM CLEANING..........................................................................6-30
6.8.2 TONER RECYCLING .....................................................................6-30
6.9 PAPER FEED..........................................................................................6-31
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