Ricoh B039 Service Manual page 17

6.9 DEVELOPMENT .....................................................................................6-39
6.9.1 OVERVIEW ....................................................................................6-39
6.9.2 DRIVE.............................................................................................6-40
6.9.3 DEVELOPER MIXING ....................................................................6-40
6.9.4 DEVELOPMENT BIAS ...................................................................6-41
6.9.5 TONER SUPPLY ............................................................................6-42
Toner Bottle Replenishment Mechanism ............................................6-42
Toner Supply Mechanism ...................................................................6-43
6.9.6 TONER DENSITY CONTROL ........................................................6-44
Overview.............................................................................................6-44
Toner Density Sensor Initial Setting....................................................6-46
Toner Concentration Measurement ....................................................6-46
Vsp/Vsg Detection ..............................................................................6-46
Toner Supply Reference Voltage (Vref) Determination.......................6-46
Toner Supply Determination ...............................................................6-46
Toner Supply Motor On Time Determinations.....................................6-47
6.9.7 TONER SUPPLY IN ABNORMAL SENSOR CONDITIONS...........6-48
ID Sensor............................................................................................6-48
TD Sensor...........................................................................................6-48
6.9.8 TONER NEAR END/END DETECTION AND RECOVERY............6-49
Toner Near End Detection ..................................................................6-49
Toner Near End Recovery ..................................................................6-49
Toner End Detection ...........................................................................6-49
Toner End Recovery ...........................................................................6-49
6.10 DRUM CLEANING AND TONER RECYCLING.....................................6-50
6.10.1 DRUM CLEANING........................................................................6-50
6.10.2 TONER RECYCLING ...................................................................6-50
6.11 PAPER FEED........................................................................................6-51
6.11.1 OVERVIEW ..................................................................................6-51
6.11.2 PAPER FEED DRIVE MECHANISM ............................................6-52
6.11.3 PAPER FEED AND SEPARATION MECHANISM........................6-52
6.11.4 PAPER LIFT MECHANISM ..........................................................6-53
6.11.5 PAPER END DETECTION ...........................................................6-53
6.11.6 PAPER SIZE DETECTION...........................................................6-54
Paper Tray ..........................................................................................6-54
By-pass Tray.......................................................................................6-55
6.11.7 SIDE FENCES..............................................................................6-56
6.11.8 PAPER REGISTRATION..............................................................6-56
6.12 IMAGE TRANSFER AND PAPER SEPARATION .................................6-57
6.12.1 OVERVIEW ..................................................................................6-57
6.12.2 IMAGE TRANSFER CURRENT TIMING......................................6-58
6.12.3 TRANSFER ROLLER CLEANING................................................6-59
6.12.4 PAPER SEPARATION MECHANISM...........................................6-59
6.13 IMAGE FUSING AND PAPER EXIT......................................................6-60
6.13.1 OVERVIEW ..................................................................................6-60
6.13.2 FUSING DRIVE AND RELEASE MECHANISM ...........................6-60
6.13.3 FUSING ENTRANCE GUIDE SHIFT............................................6-61
6.13.4 PRESSURE ROLLER...................................................................6-61
6.13.5 FUSING TEMPERATURE CONTROL..........................................6-62
SM vii B039/B040/B043