Ricoh G133 Service Manual page 21

6.2.5 TONER SUPPLY CONTROL ..........................................................6-13
Overview.............................................................................................6-13
Toner Supply Control Modes ..............................................................6-13
6.2.6 TONER NEAR END/TONER END DETECTION.............................6-14
6.3 LASER EXPOSURE.................................................................................6-16
6.3.1 OVERVIEW .....................................................................................6-16
6.3.2 OPTICAL PATH...............................................................................6-17
6.3.3 LASER SYNCHRONIZING DETECTORS.......................................6-18
Overview.............................................................................................6-18
6.3.4 LD SAFETY SWITCH......................................................................6-19
6.3.5 AUTOMATIC LINE POSITION ADJUSTMENT ...............................6-20
Overview.............................................................................................6-20
Summary of Each Adjustment ............................................................6-20
Adjustment Conditions ........................................................................6-21
Main Scan Skew Adjustment ..............................................................6-23
ID Sensors ..........................................................................................6-23
6.3.6 SHUTTER MECHANISM.................................................................6-24
6.4 PCU (PHOTO CONDUCTOR UNIT) ........................................................6-25
6.4.1 OVERVIEW .....................................................................................6-25
6.4.2 AROUND THE DRUM .....................................................................6-26
Drum Drive..........................................................................................6-26
Phase Control Mechanism..................................................................6-26
Drum Charge and Quenching .............................................................6-27
Drum Cleaning ....................................................................................6-28
6.4.3 DEVELOPMENT .............................................................................6-29
Development Operation ......................................................................6-29
Drive ...................................................................................................6-30
Developer Agitation.............................................................................6-30
Development Bias...............................................................................6-31
New Unit Detection .............................................................................6-31
6.5 TONER SUPPLY......................................................................................6-33
6.5.1 OVERVIEW .....................................................................................6-33
6.5.2 TONER SUPPLY MECHANISM ......................................................6-34
Toner supply from toner bottle to toner attraction pump .....................6-34
Toner Near End Detection ..................................................................6-34
Toner supply from toner attraction pump to development unit ............6-35
6.5.3 TONER CARTRIDGE......................................................................6-36
RFID (Radio Frequency ID) ................................................................6-36
6.6 WASTE TONER COLLECTION ...............................................................6-37
6.6.1 TONER COLLECTION PATH AND DRIVE .....................................6-37
From PCU...........................................................................................6-37
From Image Transfer Belt Unit............................................................6-37
Used Toner Distribution Mechanism ...................................................6-38
6.6.2 TONER COLLECTION BOTTLE SET/ NEAR-FULL/ FULL
DETECTION.............................................................................................6-38
6.7 IMAGE TRANSFER AND PAPER SEPARATION ....................................6-40
SM ix G133