Ricoh B079 Service Manual page 20

6.8.3 DEVELOPER MIXING .....................................................................6-56
6.8.4 DEVELOPMENT BIAS ....................................................................6-57
Mechanism .........................................................................................6-57
Correction for paper width and thickness (by-pass tray only)..............6-57
6.8.5 TONER SUPPLY.............................................................................6-58
Toner bottle replenishment mechanism ..............................................6-58
Toner supply mechanism....................................................................6-59
Toner density control ..........................................................................6-60
Sensor Control Mode ..........................................................................6-60
Image Pixel Count Mode.....................................................................6-61
6.8.6 TONER NEAR END/END DETECTION ..........................................6-61
6.8.7 TONER END RECOVERY ..............................................................6-62
6.8.8 TONER SUPPLY WITH ABNORMAL SENSORS ...........................6-62
6.9 DRUM CLEANING AND TONER RECYCLING........................................6-63
6.9.1 DRUM CLEANING ..........................................................................6-63
6.9.2 TONER RECYCLING ......................................................................6-63
6.10 PAPER FEED.........................................................................................6-64
6.10.1 OVERVIEW ...................................................................................6-64
6.10.2 PAPER FEED DRIVE ....................................................................6-65
6.10.3 PICK-UP AND SEPARATION ROLLER RELEASE MECHANISM 6-65
6.10.4 PAPER LIFT ..................................................................................6-66
6.10.5 PAPER END DETECTION ............................................................6-67
6.10.6 PAPER REGISTRATION...............................................................6-68
6.10.7 PAPER SIZE DETECTION ............................................................6-69
6.11 BY-PASS TRAY .....................................................................................6-70
6.11.1 OVERVIEW ...................................................................................6-70
6.11.2 BY-PASS TRAY OPERATION.......................................................6-71
6.11.3 BY-PASS PAPER SIZE DETECTION ...........................................6-72
6.12 DUPLEX UNIT........................................................................................6-73
6.12.1 OVERVIEW ...................................................................................6-73
6.12.2 DUPLEX DRIVE LAYOUT .............................................................6-74
6.12.3 DUPLEX BASIC OPERATION.......................................................6-75
Larger than A4 lengthwise/LT lengthwise ...........................................6-75
Up to A4 lengthwise/LT lengthwise .....................................................6-75
6.12.4 DUPLEX UNIT FEED IN AND EXIT MECHANISM........................6-76
Feed-in................................................................................................6-76
Inversion and Exit ...............................................................................6-76
6.13 IMAGE TRANSFER AND PAPER SEPARATION ..................................6-77
6.13.1 OVERVIEW ...................................................................................6-77
6.13.2 BELT DRIVE MECHANISM ...........................................................6-78
6.13.3 TRANSFER BELT UNIT CONTACT MECHANISM .......................6-78
6.13.4 IMAGE TRANSFER AND PAPER SEPARATION MECHANISM ..6-79
6.13.5 TRANSFER BELT CHARGE .........................................................6-80
Mechanism .........................................................................................6-80
Correction for paper width and thickness............................................6-81
Currents applied to leading edge and image areas, and for by-pass feed
............................................................................................................6-82
6.13.6 TRANSFER BELT CLEANING MECHANISM ...............................6-83
6.14 IMAGE FUSING AND PAPER EXIT .......................................................6-84
B079/B082
CÓPIA NÃO CONTROLADA
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CÓPIA NÃO CONTROLADA
SM