Ricoh B064 Service Manual page 25

6.8.7 DRUM CLEANING..........................................................................6-55
6.8.8 DRUM VENTILATION AND OZONE FILTER.................................6-56
6.8.9 TONER RECYCLING .....................................................................6-57
6.8.10 WASTE TONER COLLECTION....................................................6-58
Mechanism .........................................................................................6-58
Error Detection....................................................................................6-58
6.8.11 PROCESS CONTROL..................................................................6-59
What Happens at Power On ...............................................................6-59
Drum Potential Sensor Calibration......................................................6-60
Development Bias, Bias Grid, and LD Adjustment..............................6-61
ID Sensor Calibration (Vsg) ................................................................6-63
TD Sensor Calibration (Vref)...............................................................6-63
6.9 DEVELOPMENT AND TONER SUPPLY ................................................6-64
6.9.1 OVERVIEW ....................................................................................6-64
Development Unit ...............................................................................6-64
Toner Supply ......................................................................................6-65
6.9.2 DEVELOPMENT UNIT ...................................................................6-66
6.9.3 DEVELOPER/TONER MIXING (AGITATION)................................6-67
6.9.4 DEVELOPMENT BIAS ...................................................................6-68
6.9.5 TONER SUPPLY ............................................................................6-69
6.9.6 DEVELOPMENT UNIT DRIVE AND VENTILATION ......................6-70
6.9.7 TONER END SENSOR ..................................................................6-71
6.9.8 SHUTTER MECHANISM................................................................6-71
6.9.9 TONER BOTTLE SUPPLY AND VENTILATION ............................6-72
6.9.10 TONER SUPPLY CONTROL .......................................................6-73
Sensor Control Mode ..........................................................................6-73
Pixel Count Toner Supply Mode .........................................................6-74
TD Sensor Initialization .......................................................................6-75
Determining Vref .................................................................................6-75
Toner Supply without ID Sensor and TD Sensors ..............................6-76
Abnormal TD Sensor Output...............................................................6-76
Abnormal ID Sensor Output................................................................6-76
Toner End Detection ...........................................................................6-77
Toner End Recovery ...........................................................................6-77
6.10 IMAGE TRANSFER AND PAPER SEPARATION .................................6-78
6.10.1 OVERVIEW ..................................................................................6-78
6.10.2 TRANSFER BELT LIFT ................................................................6-79
Mechanism .........................................................................................6-79
Timing .................................................................................................6-80
6.10.3 TRANSFER BELT CHARGE ........................................................6-81
6.10.4 TRANSFER CURRENT SETTINGS .............................................6-82
6.10.5 TRANSFER CURRENT CIRCUIT ................................................6-83
6.10.6 TRANSFER BELT DRIVE AND PAPER TRANSPORT................6-84
6.10.7 TRANSFER BELT CLEANING .....................................................6-85
6.10.8 ANTI-CONDENSATION HEATER ................................................6-86
6.11 PAPER FEED........................................................................................6-87
6.11.1 OVERVIEW ..................................................................................6-87
Tray Capacities ...................................................................................6-88
Built-in Feed Stations..........................................................................6-88
SM xiii B064Series/B140 Series/G126
Rev. 06/2005