Ricoh LDD280 Service Manual page 21

Master clamp error..............................................................................6-57
6.7 DRUM......................................................................................................6-58
6.7.1 OVERVIEW ....................................................................................6-58
6.7.2 INK SUPPLY AND KNEADING MECHANISM ...............................6-59
Ink Cartridge Installation .....................................................................6-59
Ink Supply Mechanism........................................................................6-59
Ink Pump Operation Monitoring ..........................................................6-59
Ink Detection Board ............................................................................6-60
Drum Type Detection ..........................................................................6-61
Color Drum ID Detection.....................................................................6-62
Automatic Ink Supply for a New Drum ................................................6-64
Ink Kneading Mechanism....................................................................6-65
Drum Idling Mechanism ......................................................................6-66
6.7.3 DRUM SHIFT MECHANISM FOR IMAGE SIDE-TO-SIDE SHIFT .6-69
6.7.4 DRUM SET MECHANISM ..............................................................6-70
Upper Handle and Lock ......................................................................6-70
Front Lock Lever .................................................................................6-70
Drum Rotation Lock Mechanism .........................................................6-71
6.7.5 DRUM DRIVE MECHANISM ..........................................................6-72
6.7.6 MASTER DETECTION ...................................................................6-74
6.7.7 DRUM HOME POSITION DETECTION .........................................6-75
6.8 PAPER FEED..........................................................................................6-76
6.8.1 OVERVIEW ....................................................................................6-76
Feed and Separation ..........................................................................6-76
Feed/Separation Pressure ..................................................................6-76
Registration.........................................................................................6-76
6.8.2 PAPER FEED MECHANISM ..........................................................6-77
6.8.3 PAPER FEED/SEPARATION PRESSURE ADJUSTMENT
MECHANISM............................................................................................6-78
Paper feed pressure ...........................................................................6-78
Paper separation pressure..................................................................6-79
Friction Pad Exchange Mechanism ....................................................6-80
Paper Types .......................................................................................6-81
6.8.4 PAPER REGISTRATION MECHANISM.........................................6-83
Registration Roller Drive .....................................................................6-83
Registration Roller Up/Down Mechanism ...........................................6-85
6.8.5 PAPER FEED CONTROL MECHANISM........................................6-86
Registration Roller ..............................................................................6-86
Paper Slip Correction..........................................................................6-86
Feed Speed Correction.......................................................................6-86
6.8.6 PAPER FEED RETRY MECHANISM .............................................6-87
6.8.7 REGISTRATION ROLLER PRESSURE RELEASE MECHANISM.....6-88
6.8.8 DOUBLE FEED DETECTION.........................................................6-89
Mechanism .........................................................................................6-89
Recovery from Double Feed ...............................................................6-90
6.8.9 PAPER TABLE ANGLE ADJUSTMENT MECHANISM ..................6-91
6.8.10 PAPER TABLE UP/DOWN MECHANISM ....................................6-92
Paper Table Drive Mechanism............................................................6-92
6.8.11 PAPER SIDE FENCE MECHANISM ............................................6-93
SM ix C262/C265