Ricoh B051 Service Manual page 20

Front Door...........................................................................................6-44
Circuit..................................................................................................6-44
Operation Panel Display and Switch Mechanism ...............................6-45
6.9 DEVELOPMENT .....................................................................................6-46
6.9.1 OVERVIEW ....................................................................................6-46
6.9.2 DEVELOPMENT UNIT ...................................................................6-47
Replacing Units...................................................................................6-47
Memory Chip ......................................................................................6-47
6.9.3 TONER SUPPLY MECHANISM .....................................................6-48
Drive ...................................................................................................6-48
Rollers and Agitators...........................................................................6-49
Shutter ................................................................................................6-49
6.9.4 TONER END DETECTION.............................................................6-50
Mechanism .........................................................................................6-50
Toner Near-End Detection ..................................................................6-50
Toner End Detection ...........................................................................6-51
Toner End Recovery ...........................................................................6-51
6.9.5 DEVELOPMENT UNIT CONTACT MECHANISM ..........................6-52
Mechanism .........................................................................................6-52
Reverse Rotation ................................................................................6-52
6.9.6 POWER SOURCE..........................................................................6-53
Development, Toner Supply, and Doctor Rollers ................................6-53
Doctor Roller.......................................................................................6-53
6.10 PAPER FEED........................................................................................6-54
6.10.1 OVERVIEW ..................................................................................6-54
Transport Speed .................................................................................6-55
Friction Pad.........................................................................................6-55
6.10.2 DRIVE MECHANISM....................................................................6-55
Feed and Vertical Transport ...............................................................6-55
Registration.........................................................................................6-55
6.10.3 PAPER LIFT .................................................................................6-56
Lift Mechanism....................................................................................6-56
Paper End/Near-End Detection ..........................................................6-56
6.10.4 PAPER SIZE DETECTION...........................................................6-57
Mechanism .........................................................................................6-57
Switch Pattern.....................................................................................6-57
6.11 PAPER TRANSFER AND SEPARATION..............................................6-58
6.11.1 OVERVIEW ..................................................................................6-58
Jammed Paper Release .....................................................................6-58
Image Transfer and Paper Separation................................................6-58
6.11.2 CONTACT/SEPARATION MECHANISM .....................................6-59
Timing .................................................................................................6-59
Mechanism .........................................................................................6-59
6.11.3 POWER SUPPLY .........................................................................6-60
Circuit..................................................................................................6-60
Paper Transfer Roller Bias..................................................................6-60
Discharge Plate ..................................................................................6-60
Temperature/Humidity Control............................................................6-60
Roller Cleaning ...................................................................................6-61
B051/B052
CÓPIA NÃO CONTROLADA
viii
CÓPIA NÃO CONTROLADA
SM