Ricoh B230 Service Manual page 25

6.4 Image Processing ........................................................................... 6-20
6.4.1 Overview ..................................................................................... 6-20
6.4.2 SBU (Sensor Board Unit) ............................................................ 6-20
6.4.3 IPU (Image Processing Unit) ....................................................... 6-21
6.5 Laser Exposure ............................................................................... 6-22
6.5.1 Overview ..................................................................................... 6-22
6.5.2 Optical Path ................................................................................. 6-23
6.5.3 Laser Synchronizing Detectors.................................................... 6-24
6.5.4 LD Safety Switch ......................................................................... 6-25
6.5.5 Automatic Line Position Adjustment ............................................ 6-26
6.6 PCU (Photo Conductor Unit) ........................................................... 6-31
6.6.1 Overview ..................................................................................... 6-31
6.6.2 Around the Drum ......................................................................... 6-32
6.6.3 Development ............................................................................... 6-35
6.7 Toner Supply ................................................................................... 6-38
6.7.1 Overview ..................................................................................... 6-38
6.7.2 Toner Supply Mechanism ............................................................ 6-39
6.7.3 Toner Cartridge............................................................................ 6-41
6.8 Waste Toner Collection ................................................................... 6-42
6.8.1 Toner Collection Path and Drive .................................................. 6-42
6.8.2 Toner Collection Bottle Set/ Near-Full/ Full Detection.................. 6-44
6.9 Image Transfer and Paper Separation ............................................ 6-45
6.9.1 Image Transfer ............................................................................ 6-45
6.9.2 Paper Transfer and Separation.................................................... 6-51
6.10 Paper Feed ..................................................................................... 6-54
6.10.1 Overview .................................................................................. 6-54
6.10.2 Drive - Tray 1, Tray 2, and By-Pass Tray ................................ 6-55
6.10.3 Paper Lift - Trays 1 & 2............................................................ 6-56
6.10.4 Paper Size Detection - Trays 1 & 2 ......................................... 6-57
6.10.5 Paper Height Detection - Trays 1 & 2...................................... 6-58
6.10.6 Paper End Detection - Trays 1 & 2.......................................... 6-59
6.10.7 Registration.............................................................................. 6-60
6.10.8 Paper Feed Line Speed ........................................................... 6-60
6.10.9 Tray Lock Mechanism .............................................................. 6-61
6.10.10 Paper Dust Collection........................................................... 6-62
6.10.11 By-pass Paper Separation.................................................... 6-62
SM ix B230/B237