Ricoh TH-C1b Service Manual page 11

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 ..........................6-53
Mechanism .........................................................................................6-53
Reverse Rotation ................................................................................6-54
6.9.6 POWER SOURCE..........................................................................6-55
Development, Toner Supply, and Doctor Rollers................................6-55
Doctor Roller.......................................................................................6-55
6.10 PAPER FEED........................................................................................6-56
6.10.1 OVERVIEW ..................................................................................6-56
Transport Speed .................................................................................6-57
Friction Pad.........................................................................................6-57
6.10.2 DRIVE MECHANISM....................................................................6-57
Feed and Vertical Transport ...............................................................6-57
Registration.........................................................................................6-57
6.10.3 PAPER LIFT .................................................................................6-58
Lift Mechanism....................................................................................6-58
Paper End/Near-End Detection ..........................................................6-58
6.10.4 PAPER SIZE DETECTION...........................................................6-59
Mechanism .........................................................................................6-59
Switch Pattern.....................................................................................6-59
6.11 PAPER TRANSFER AND SEPARATION..............................................6-60
6.11.1 OVERVIEW ..................................................................................6-60
Jammed Paper Release .....................................................................6-60
Image Transfer and Paper Separation................................................6-60
6.11.2 CONTACT/SEPARATION MECHANISM .....................................6-61
Timing .................................................................................................6-61
Mechanism .........................................................................................6-61
6.11.3 POWER SUPPLY .........................................................................6-62
Circuit..................................................................................................6-62
Paper Transfer Roller Bias..................................................................6-62
Discharge Plate ..................................................................................6-62
Temperature/Humidity Control............................................................6-62
Roller Cleaning ...................................................................................6-63
6.12 IMAGE FUSING AND PAPER EXIT......................................................6-64
6.12.1 OVERVIEW ..................................................................................6-64
6.12.2 DRIVE...........................................................................................6-65
6.12.3 FUSING UNIT COMPONENTS ....................................................6-66
Fusing Belt..........................................................................................6-66
Heating Roller Lamp and Pressure Roller Lamp.................................6-66
Fusing Bias .........................................................................................6-67
Fusing Unit SCs ..................................................................................6-67
6.12.4 OIL SUPPLY.................................................................................6-68
Oil Supply ...........................................................................................6-68
Oil Supply ...........................................................................................6-69
Oil End Detection and Recovery .........................................................6-70
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