Ricoh B156 Service Manual page 21

6.9 DEVELOPMENT .....................................................................................6-47
6.9.1 OVERVIEW ....................................................................................6-47
6.9.2 DEVELOPMENT UNIT ...................................................................6-48
Replacing Units...................................................................................6-48
Distinguishing the development unit with the one for the B051 series ....6-48
Memory chip .......................................................................................6-48
6.9.3 TONER SUPPLY MECHANISM .....................................................6-49
Drive ...................................................................................................6-49
Rollers and Agitators...........................................................................6-50
Shutter ................................................................................................6-50
6.9.4 TONER END DETECTION.............................................................6-51
Mechanism .........................................................................................6-51
Toner Near-End Detection ..................................................................6-51
Toner End Detection ...........................................................................6-52
Toner End Recovery ...........................................................................6-52
6.9.5 DEVELOPMENT UNIT CONTACT MECHANISM ..........................6-54
Mechanism .........................................................................................6-54
Reverse Rotation ................................................................................6-55
6.9.6 POWER SOURCE..........................................................................6-56
Development, Toner Supply, and Doctor Rollers ................................6-56
Doctor Roller.......................................................................................6-56
6.10 PAPER FEED........................................................................................6-57
6.10.1 OVERVIEW ..................................................................................6-57
Transport Speed .................................................................................6-58
Friction Pad.........................................................................................6-58
6.10.2 DRIVE MECHANISM....................................................................6-58
Feed and Vertical Transport ...............................................................6-58
Registration.........................................................................................6-58
6.10.3 PAPER LIFT .................................................................................6-59
Lift Mechanism....................................................................................6-59
Paper End/Near-End Detection ..........................................................6-59
6.10.4 PAPER SIZE DETECTION...........................................................6-60
Mechanism .........................................................................................6-60
Switch Pattern.....................................................................................6-60
6.11 PAPER TRANSFER AND SEPARATION..............................................6-61
6.11.1 OVERVIEW ..................................................................................6-61
Jammed Paper Release .....................................................................6-61
Image Transfer and Paper Separation................................................6-61
6.11.2 CONTACT/SEPARATION MECHANISM .....................................6-62
Timing .................................................................................................6-62
Mechanism .........................................................................................6-62
6.11.3 POWER SUPPLY .........................................................................6-63
Circuit..................................................................................................6-63
Paper Transfer Roller Bias..................................................................6-63
Discharge Plate ..................................................................................6-63
Temperature/Humidity Control............................................................6-63
Roller Cleaning ...................................................................................6-64
6.12 IMAGE FUSING AND PAPER EXIT......................................................6-65
6.12.1 OVERVIEW ..................................................................................6-65
SM
CÓPIA NÃO CONTROLADA
ix
CÓPIA NÃO CONTROLADA
B156/B220