Ricoh A-P3 Service Manual page 10

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
6.12.4 IMAGE TRANSFER AND PAPER SEPARATION
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
6.13 IMAGE FUSING AND PAPER EXIT......................................................6-51
6.13.1 OVERVIEW ..................................................................................6-51
6.13.2 FUSING DRIVE ............................................................................6-52
6.13.3 FUSING ENTRANCE GUIDE SHIFT MECHANISM .....................6-52
6.13.4 EXIT GUIDE PLATE AND DE-CURLER ROLLERS .....................6-53
6.13.5 PRESSURE ROLLER...................................................................6-53
6.13.6 CLEANING MECHANISM ............................................................6-53
6.13.7 FUSING TEMPERATURE CONTROL..........................................6-54
Temperature Control...........................................................................6-54
Fusing Idling Temperature ..................................................................6-55
6.13.8 OVERHEAT PROTECTION .........................................................6-55
6.14 ENERGY SAVER MODE ......................................................................6-56
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