Ricoh LDD280 Service Manual page 20

6.4.1 SPECIFICATIONS..........................................................................6-22
Thermal Head Control.........................................................................6-22
Thermal Head Protection ....................................................................6-22
REMARKS FOR HANDLING THE THERMAL HEAD .........................6-23
6.5 MASTER EJECT .....................................................................................6-24
6.5.1 OVERVIEW ....................................................................................6-24
6.5.2 MASTER EJECT MECHANISM .....................................................6-25
Overview.............................................................................................6-25
Drum Lock Mechanism .......................................................................6-26
Master Pick-up Roller Drive and Master Clamper Open .....................6-27
Master Eject and Transportation .........................................................6-28
Master Eject Roller Unit Drive.............................................................6-28
Master Eject Roller Unit Slide-out Mechanism....................................6-29
6.5.3 MASTER EJECT BOX MECHANISM .............................................6-30
6.5.4 MASTER EJECT BOX LOCK MECHANISM ..................................6-32
6.5.5 PRESSURE PLATE DRIVE MECHANISM.....................................6-33
Overview.............................................................................................6-33
Drive ...................................................................................................6-33
Homing Operation...............................................................................6-34
Shift to the Master Eject Position ........................................................6-35
Ejected Master Compression ..............................................................6-36
Master Box Full Detection Mechanism................................................6-38
Pressure Plate Operation Timing Charts ............................................6-39
6.6 MASTER FEED .......................................................................................6-41
6.6.1 OVERVIEW ....................................................................................6-41
6.6.2 MASTER SET MECHANISM ..........................................................6-42
Master Roll Set ...................................................................................6-42
Master Feed and Stop Control (Edge Detection) ................................6-42
Master End Detection .........................................................................6-44
Master Amount Detection ...................................................................6-45
6.6.3 MASTER MAKING AND FEED MECHANISM................................6-46
Master Feed Mechanism ....................................................................6-46
Platen Roller Pressure Release ..........................................................6-47
Master Buffer Mechanism ...................................................................6-48
6.6.4 WRAPPING THE MASTER AROUND THE DRUM........................6-49
Drum Lock and Master Clamper Open ...............................................6-49
Master Feed Control Roller Mechanism..............................................6-50
Master Clamping and Wrapping around the Drum..............................6-51
Cutter Mechanism...............................................................................6-52
Master Buffer Duct Entrance Control ..................................................6-53
Misfed Master Detection .....................................................................6-54
Opening the Door for Misfed Master Removal....................................6-54
6.6.5 MASTER MAKING UNIT SET MECHANISM .................................6-55
Master Making Unit Slide-out Mechanism...........................................6-55
Master Making Unit Lock Mechanism .................................................6-55
6.6.6 MASTER JAM, CUTTER ERROR, AND CLAMP ERROR
DETECTION.............................................................................................6-56
Master set error and misfeed ..............................................................6-56
Master cut error ..................................................................................6-57
C262/C265 viii SM