Ricoh A229 Service Manual page 13

2.5.4 DRUM CHARGE ............................................................................ 2-56
Overview ............................................................................................ 2-56
Charge Corona Wire Cleaning Mechanism ........................................ 2-57
2.5.5 DRUM CLEANING AND TONER RECYCLING ............................. 2-58
Overview ............................................................................................ 2-58
Drive Mechanism................................................................................ 2-59
Cleaning Blade Pressure Mechanism and Side-to-Side Movement ... 2-60
Toner Recycling and Waste Toner Collection Mechanism................. 2-61
2.5.6 OTHERS ........................................................................................ 2-64
Air Flow Around the Drum .................................................................. 2-64
Pick-off Mechanism............................................................................ 2-65
Quenching.......................................................................................... 2-66
2.6 DEVELOPMENT AND TONER SUPPLY................................................ 2-67
2.6.1 OVERVIEW.................................................................................... 2-67
2.6.2 DEVELOPMENT MECHANISM ..................................................... 2-68
2.6.3 DRIVE MECHANISM ..................................................................... 2-69
2.6.4 CROSSMIXING.............................................................................. 2-70
2.6.5 DEVELOPMENT BIAS................................................................... 2-71
2.6.6 TONER SUPPLY ........................................................................... 2-72
Toner Bottle Mechanism .................................................................... 2-72
Toner Supply Mechanism................................................................... 2-73
Toner End Detection .......................................................................... 2-74
2.6.7 TONER DENSITY CONTROL ....................................................... 2-75
Overview ............................................................................................ 2-75
Sensor control mode .......................................................................... 2-75
Image pixel count control ................................................................... 2-76
2.6.8 TONER END DETECTION ............................................................ 2-77
Toner Near End.................................................................................. 2-77
Toner End .......................................................................................... 2-77
2.6.9 TONER END RECOVERY............................................................. 2-77
2.6.10 ABNORMAL TD SENSOR CONDITIONS.................................... 2-78
2.7 IMAGE TRANSFER AND PAPER SEPARATION .................................. 2-79
2.7.1 OVERVIEW.................................................................................... 2-79
2.7.2 IMAGE TRANSFER AND PAPER SEPARATION MECHANISM... 2-80
2.7.3 TRANSFER BELT UNIT LIFT MECHANISM ................................. 2-82
2.7.4 PAPER TRANSPORTATION AND BELT DRIVE MECHANISM... 2-83
2.7.5 TRANSFER BELT CLEANING MECHANISM................................ 2-84
2.7.6 TONER COLLECTION MECHANISM............................................ 2-85
2.8 PAPER FEED ......................................................................................... 2-86
2.8.1 OVERVIEW.................................................................................... 2-86
2.8.2 DRIVE MECHANISM ..................................................................... 2-87
2.8.3 TRAY POSITIONING MECHANISM - TRAYS 1 AND 2................ 2-88
2.8.4 PAPER LIFT MECHANISM - TRAYS 1 AND 2 .............................. 2-89
2.8.5 PICK-UP AND FEED MECHANISM - TRAYS 1 TO 3................... 2-91
Overview ............................................................................................ 2-91
Pick-up and Feed ............................................................................... 2-92
Separation Roller Release Mechanism .............................................. 2-93
Paper Skew Prevention Mechanism................................................... 2-94
2.8.6 VERTICAL TRANSPORT MECHANISM........................................ 2-95
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A229