Ricoh B264 Service Manual page 20

6.8 DRUM CHARGE .....................................................................................6-56
6.8.1 OVERVIEW ....................................................................................6-56
6.8.2 CHARGE ROLLER VOLTAGE CORRECTION ..............................6-57
Correction for Environmental Conditions ............................................6-57
6.8.3 CORRECTION FOR PAPER WIDTH AND THICKNESS ...............6-58
6.8.4 ID SENSOR PATTERN PRODUCTION TIMING............................6-59
6.8.5 DRUM CHARGE ROLLER CLEANING ..........................................6-59
6.9 DEVELOPMENT .....................................................................................6-60
6.9.1 OVERVIEW ....................................................................................6-60
6.9.2 DRIVE MECHANISM......................................................................6-61
6.9.3 DEVELOPER MIXING ....................................................................6-61
6.9.4 DEVELOPMENT BIAS ...................................................................6-62
Mechanism .........................................................................................6-62
Correction for paper width and thickness (by-pass tray only) .............6-62
6.9.5 TONER SUPPLY ............................................................................6-63
Toner bottle replenishment mechanism ..............................................6-63
Toner supply mechanism....................................................................6-64
Toner Scatter Prevention ....................................................................6-65
Sensor Control Mode ..........................................................................6-66
Image Pixel Count Mode.....................................................................6-67
6.9.6 TONER NEAR END/END DETECTION .........................................6-67
Toner Near End ..................................................................................6-67
Toner End ...........................................................................................6-67
6.9.7 TONER END RECOVERY .............................................................6-68
6.9.8 TONER SUPPLY WITH ABNORMAL SENSORS ..........................6-68
6.10 DRUM CLEANING AND TONER RECYCLING.....................................6-69
6.10.1 DRUM CLEANING........................................................................6-69
6.10.2 TONER RECYCLING ...................................................................6-69
6.11 PAPER FEED........................................................................................6-70
6.11.1 OVERVIEW ..................................................................................6-70
6.11.2 PAPER FEED DRIVE ...................................................................6-71
6.11.3 PICK-UP AND SEPARATION ROLLER
RELEASE MECHANISM .............................................................6-71
6.11.4 PAPER LIFT .................................................................................6-72
6.11.5 PAPER END DETECTION ...........................................................6-73
6.11.6 PAPER REGISTRATION..............................................................6-74
6.11.7 PAPER SIZE DETECTION...........................................................6-75
6.12 BY-PASS TRAY ....................................................................................6-76
6.12.1 OVERVIEW ..................................................................................6-76
6.12.2 BY-PASS TRAY OPERATION .....................................................6-77
6.12.3 BY-PASS PAPER SIZE DETECTION ..........................................6-78
6.13 DUPLEX UNIT.......................................................................................6-79
6.13.1 OVERVIEW ..................................................................................6-79
6.13.2 DUPLEX DRIVE LAYOUT ............................................................6-80
6.13.3 DUPLEX BASIC OPERATION .....................................................6-81
Longer than A4 lengthwise/LT lengthwise ..........................................6-81
Up to A4 lengthwise/LT lengthwise .....................................................6-81
6.13.4 DUPLEX UNIT FEED IN AND EXIT MECHANISM.......................6-82
Feed-in................................................................................................6-82
B264/B265 viii SM