vii
6.3.4 DUAL BEAM WRITING.................................................................. 6-24
Dual Beam Mechanism ...................................................................... 6-24
Laser Beam Pitch Change Mechanism .............................................. 6-24
Printing Mode and Black LD Unit Position.......................................... 6-25
6.3.5 LD SAFETY SWITCH .................................................................... 6-26
Error Messages.................................................................................. 6-27
6.3.6 AUTOMATIC LINE POSITION ADJUSTMENT.............................. 6-28
Overview ............................................................................................ 6-28
Summary of Each Adjustment............................................................ 6-29
Adjustment Conditions ....................................................................... 6-30
Main Scan Skew Adjustment.............................................................. 6-31
6.4 PHOTOCONDUCTOR UNIT .................................................................. 6-32
6.4.1 OVERVIEW.................................................................................... 6-32
6.4.2 DRIVE............................................................................................ 6-33
6.4.3 DRUM GEAR POSITION SENSORS ............................................ 6-34
Mechanism......................................................................................... 6-34
Initialization Process and SC Codes .................................................. 6-35
6.4.4 DRUM CHARGE AND QUENCHING ............................................ 6-36
6.4.5 DRUM CLEANING......................................................................... 6-37
6.4.6 WASTE TONER COLLECTION..................................................... 6-38
6.4.7 WASTE TONER BOTTLE FULL DETECTION .............................. 6-39
6.4.8 PCU DETECTION (DEVELOPMENT UNIT DETECTION) ............ 6-40
Detection Pins.................................................................................... 6-40
Detection Process .............................................................................. 6-40
Error Message.................................................................................... 6-41
6.5 DEVELOPMENT..................................................................................... 6-42
6.5.1 OVERVIEW.................................................................................... 6-42
6.5.2 DRIVE............................................................................................ 6-43
6.5.3 DEVELOPER AGITATION............................................................. 6-44
6.5.4 DEVELOPMENT BIAS................................................................... 6-45
6.5.5 DEVELOPMENT UNIT DETECTION............................................. 6-45
6.5.6 TONER SUPPLY MECHANISM .................................................... 6-46
Overview ............................................................................................ 6-46
Toner Agitation and Attraction............................................................ 6-46
Air Flow and Toner Flow .................................................................... 6-47
Toner Near End Detection.................................................................. 6-47
Toner Transport ................................................................................. 6-48
6.5.7 TONER CARTRIDGE DETECTION............................................... 6-49
6.6 PAPER FEED ......................................................................................... 6-50
6.6.1 OVERVIEW.................................................................................... 6-50
6.6.2 DRIVE – TRAY 1, TRAY 2, AND BY-PASS TRAY ........................ 6-51
6.6.3 PAPER LIFT – TRAYS 1 & 2 ......................................................... 6-52
6.6.4 PAPER SIZE DETECTION – TRAYS 1 & 2................................... 6-53
6.6.5 PAPER HEIGHT DETECTION – TRAYS 1 & 2 ............................. 6-54
6.6.6 PAPER END DETECTION – TRAYS 1 & 2 ................................... 6-54
6.6.7 REGISTRATION ............................................................................ 6-55
6.6.8 PAPER FEED LINE SPEED .......................................................... 6-56
6.6.9 GRIP ROLLER RELEASE MECHANISM....................................... 6-57