Service manual

SM vii G130/G131
6.2.6 TONER NEAR END/TONER END DETECTION............................6-16
Introduction .........................................................................................6-16
Toner Near End Detection 1 ...............................................................6-17
Toner Near End Detection 2 ...............................................................6-17
Toner End Detection...........................................................................6-18
Toner End Recovery ...........................................................................6-18
6.2.7 DEVELOPER INITIALIZATION ......................................................6-19
6.3 LASER EXPOSURE................................................................................6-20
6.3.1 OVERVIEW ....................................................................................6-20
6.3.2 OPTICAL PATH..............................................................................6-21
6.3.3 LASER SYNCHRONIZING DETECTOR ........................................6-22
Overview.............................................................................................6-22
Main Scan Start Detection ..................................................................6-22
Clock Frequency Adjustment ..............................................................6-22
6.3.4 LD SAFETY SWITCH .....................................................................6-23
Front and Upper Left Cover Switch.....................................................6-23
Error Messages ..................................................................................6-24
6.3.5 AUTOMATIC LINE POSITION ADJUSTMENT ..............................6-25
Overview.............................................................................................6-25
Summary of Each Adjustment ............................................................6-26
Adjustment Conditions ........................................................................6-27
Main Scan Skew Adjustment ..............................................................6-28
6.4 PHOTOCONDUCTOR UNIT ...................................................................6-29
6.4.1 OVERVIEW ....................................................................................6-29
6.4.2 DRIVE.............................................................................................6-30
6.4.3 DRUM GEAR POSITION SENSORS .............................................6-31
Mechanism .........................................................................................6-31
Initialization Process and SC Codes ...................................................6-32
6.4.4 DRUM CHARGE AND QUENCHING .............................................6-33
6.4.5 DRUM CLEANING..........................................................................6-34
6.4.6 WASTE TONER COLLECTION .....................................................6-35
Waste Toner Path...............................................................................6-35
6.4.7 WASTE TONER BOTTLE FULL DETECTION ...............................6-37
6.5 DEVELOPMENT .....................................................................................6-38
6.5.1 OVERVIEW ....................................................................................6-38
6.5.2 DRIVE.............................................................................................6-39
6.5.3 DEVELOPER AGITATION .............................................................6-40
6.5.4 DEVELOPMENT BIAS ...................................................................6-41
6.5.5 TONER SUPPLY MECHANISM .....................................................6-42
Overview.............................................................................................6-42
Toner Agitation and Attraction ............................................................6-42
Air Flow and Toner Flow .....................................................................6-43
Toner Near End Detection ..................................................................6-43
Toner Transport ..................................................................................6-44
Shutter Mechanism.............................................................................6-45
6.5.6 TONER CARTRIDGE DETECTION ...............................................6-45
6.6 PAPER FEED..........................................................................................6-46
6.6.1 OVERVIEW ....................................................................................6-46
6.6.2 DRIVE – TRAY 1, TRAY 2, AND BY-PASS TRAY .........................6-47