Ricoh B064 SERIES Service Manual page 27

6.7.5 LD SAFETY SWITCHES ................................................................6-51
B064 Series, B140 Series Safety Switches.......................................6-51
B246/D052 Series Safety Switches ...................................................6-52
6.8 DRUM UNIT ............................................................................................6-53
6.8.1 OVERVIEW ....................................................................................6-53
6.8.2 OPC DRUM ....................................................................................6-54
6.8.3 DRUM DRIVE .................................................................................6-54
6.8.4 DRUM CHARGE.............................................................................6-55
6.8.5 CHARGE CORONA WIRE CLEANING ..........................................6-56
6.8.6 DRUM PICK-OFF MECHANISM ....................................................6-57
6.8.7 DRUM CLEANING..........................................................................6-58
6.8.8 DRUM VENTILATION AND OZONE FILTER.................................6-59
6.8.9 TONER RECYCLING .....................................................................6-60
6.8.10 WASTE TONER COLLECTION....................................................6-61
Mechanism .........................................................................................6-61
Error Detection....................................................................................6-61
6.8.11 PROCESS CONTROL..................................................................6-62
What Happens at Power On ...............................................................6-62
Drum Potential Sensor Calibration......................................................6-63
Development Bias, Bias Grid, and LD Adjustment..............................6-64
ID Sensor Calibration (Vsg) ................................................................6-66
TD Sensor Calibration (Vref)...............................................................6-66
6.9 DEVELOPMENT AND TONER SUPPLY................................................6-67
6.9.1 OVERVIEW ....................................................................................6-67
Development Unit ...............................................................................6-67
Toner Supply ......................................................................................6-68
6.9.2 DEVELOPMENT UNIT ...................................................................6-69
6.9.3 DEVELOPER/TONER MIXING (AGITATION)................................6-70
6.9.4 DEVELOPMENT BIAS ...................................................................6-71
6.9.5 TONER SUPPLY ............................................................................6-72
6.9.6 DEVELOPMENT UNIT DRIVE AND VENTILATION ......................6-73
6.9.7 TONER END SENSOR ..................................................................6-74
6.9.8 SHUTTER MECHANISM................................................................6-74
6.9.9 TONER BOTTLE SUPPLY AND VENTILATION ............................6-75
6.9.10 TONER SUPPLY CONTROL .......................................................6-76
Sensor Control Mode ..........................................................................6-76
Pixel Count Toner Supply Mode .........................................................6-77
TD Sensor Initialization .......................................................................6-78
Determining Vref .................................................................................6-78
Toner Supply without ID Sensor and TD Sensors ..............................6-79
Abnormal TD Sensor Output...............................................................6-79
Abnormal ID Sensor Output................................................................6-79
Toner End Detection ...........................................................................6-80
Toner End Recovery ...........................................................................6-80
6.10 IMAGE TRANSFER AND PAPER SEPARATION................................6-81
6.10.1 OVERVIEW ..................................................................................6-81
6.10.2 TRANSFER BELT LIFT ................................................................6-82
Mechanism .........................................................................................6-82
Timing .................................................................................................6-83
SM
CÓPIA NÃO CONTROLADA
xv
CÓPIA NÃO CONTROLADA
Rev. 04/2008
B064 Series/B140 Series
/B246 Series/D052 Series