Service manual

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Toner Supply Control Modes ..............................................................6-14
6.2.5 TONER NEAR END/TONER END DETECTION............................6-15
Introduction.........................................................................................6-15
Toner Near End Detection ..................................................................6-15
Toner End Detection...........................................................................6-15
Toner End Recovery...........................................................................6-15
6.2.6 DEVELOPER INITIALIZATION ......................................................6-16
6.3 LASER EXPOSURE................................................................................6-17
6.3.1 OVERVIEW ....................................................................................6-17
6.3.2 OPTICAL PATH..............................................................................6-18
6.3.3 LASER SYNCHRONIZING DETECTOR ........................................6-19
Overview.............................................................................................6-19
Main Scan Start Detection ..................................................................6-19
Clock Frequency Adjustment..............................................................6-19
6.3.4 DUAL BEAM WRITING ..................................................................6-20
Dual Beam Mechanism.......................................................................6-20
Laser Beam Pitch Change Mechanism...............................................6-20
6.3.5 LD SAFETY SWITCH.....................................................................6-21
6.3.6 AUTOMATIC LINE POSITION ADJUSTMENTS............................6-22
Overview.............................................................................................6-22
Sub Scan Line Position for YCM.........................................................6-23
Main Scan Line Position for KYCM.....................................................6-23
Magnification Adjustment....................................................................6-23
Main Scan Skew Adjustment ..............................................................6-24
6.4 PHOTOCONDUCTOR UNIT ...................................................................6-25
6.4.1 OVERVIEW ....................................................................................6-25
6.4.2 DRIVE.............................................................................................6-26
6.4.3 DRUM CHARGE AND QUENCHING .............................................6-27
6.4.4 DRUM CLEANING..........................................................................6-28
6.4.5 WASTE TONER COLLECTION .....................................................6-29
6.4.6 WASTE TONER BOTTLE FULL DETECTION ...............................6-30
6.4.7 PCU DETECTION (DEVELOPMENT UNIT DETECTION).............6-31
6.5 DEVELOPMENT .....................................................................................6-32
6.5.1 OVERVIEW ....................................................................................6-32
6.5.2 DRIVE.............................................................................................6-33
6.5.3 DEVELOPER AGITATION .............................................................6-34
6.5.4 DEVELOPMENT BIAS ...................................................................6-35
6.5.5 DEVELOPMENT UNIT DETECTION..............................................6-35
6.5.6 TONER SUPPLY MECHANISM .....................................................6-36
Overview.............................................................................................6-36
Toner Agitation ...................................................................................6-36
Toner Transport..................................................................................6-37
6.5.7 TONER CARTRIDGE DETECTION ...............................................6-38
6.6 PAPER FEED..........................................................................................6-39
6.6.1 OVERVIEW ....................................................................................6-39
6.6.2 DRIVE – TRAYS 1 AND 2 ..............................................................6-40
6.6.3 PAPER LIFT – TRAYS 1 & 2..........................................................6-41
6.6.4 PAPER SIZE DETECTION – TRAYS 1 & 2....................................6-42
6.6.5 PAPER HEIGHT DETECTION – TRAYS 1 & 2 ..............................6-43