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Mechanism......................................................................................... 6-24
6.7.5 TONER SUPPLY ........................................................................... 6-25
Toner Bottle Replenishment Mechanism ........................................... 6-25
Toner Supply Mechanism .................................................................. 6-26
Toner Density Control ........................................................................ 6-26
Sensor Control Mode ......................................................................... 6-27
Image Pixel Count Mode.................................................................... 6-27
6.7.6 TONER NEAR END/END DETECTION......................................... 6-28
Standard Method................................................................................ 6-28
Adjustable Near-end Warning Method ............................................... 6-28
6.7.7 TONER END RECOVERY............................................................. 6-29
6.7.8 TONER SUPPLY WITH ABNORMAL SENSORS.......................... 6-29
6.8 DRUM CLEANING AND TONER RECYCLING...................................... 6-30
6.8.1 DRUM CLEANING......................................................................... 6-30
6.8.2 TONER RECYCLING .................................................................... 6-30
6.9 PAPER FEED ......................................................................................... 6-31
6.9.1 OVERVIEW ................................................................................... 6-31
6.9.2 PAPER FEED DRIVE .................................................................... 6-32
6.9.3 PICK-UP/SEPARATION ROLLER RELEASE................................ 6-32
6.9.4 PAPER LIFT .................................................................................. 6-33
6.9.5 PAPER END DETECTION............................................................. 6-34
6.9.6 PAPER REGISTRATION............................................................... 6-34
6.9.7 PAPER SIZE DETECTION ............................................................ 6-35
6.9.8 PAPER HEIGHT DETECTION....................................................... 6-36
6.10 BY-PASS TRAY.................................................................................... 6-37
6.10.1 OVERVIEW ................................................................................. 6-37
6.10.2 BY-PASS TRAY OPERATION..................................................... 6-38
6.10.3 BY-PASS PAPER SIZE DETECTION.......................................... 6-39
6.11 DUPLEX UNIT ...................................................................................... 6-40
6.11.1 OVERVIEW ................................................................................. 6-40
6.11.2 DUPLEX DRIVE LAYOUT ........................................................... 6-41
6.11.3 DUPLEX BASIC OPERATION..................................................... 6-42
Larger than A4 Lengthwise/LT Lengthwise (SEF).............................. 6-42
Up to A4 Lengthwise/LT Lengthwise (SEF) ....................................... 6-42
6.11.4 DUPLEX UNIT FEED IN AND EXIT MECHANISM...................... 6-43
Feed-in............................................................................................... 6-43
Inversion and Exit............................................................................... 6-43
6.12 IMAGE TRANSFER AND PAPER SEPARATION ................................ 6-44
6.12.1 OVERVIEW ................................................................................. 6-44
6.12.2 BELT DRIVE MECHANISM ......................................................... 6-45
6.12.3 TRANSFER BELT UNIT CONTACT MECHANISM ..................... 6-45
MECHANISM ............................................................................... 6-46
6.12.5 TRANSFER BELT CHARGE ....................................................... 6-47
Mechanism......................................................................................... 6-47
Correction for Paper Width and Thickness......................................... 6-48
Transfer Currents to Leading Edge and Image Areas........................ 6-49
6.12.6 TRANSFER BELT CLEANING MECHANISM.............................. 6-50
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