Ricoh B234 Service Manual page 18

Width Sensors ....................................................................................3-23
Exit Sensor, Inverter Sensor ...............................................................3-24
3.4.7 TRANSPORT BELT ........................................................................3-25
3.4.8 ADF MOTORS.................................................................................3-26
Bottom Plate Motor, Pick-up Motor .....................................................3-26
Feed-in, Transport, Feed-out Motors ..................................................3-27
3.4.9 FEED-IN CLUTCH...........................................................................3-28
3.5 SCANNER UNIT.......................................................................................3-30
3.5.1 EXPOSURE GLASS........................................................................3-30
3.5.2 LENS BLOCK ..................................................................................3-31
3.5.3 ORIGINAL SIZE SENSORS ............................................................3-32
3.5.4 EXPOSURE LAMPS .......................................................................3-33
3.5.5 LAMP REGULATORS .....................................................................3-34
3.5.6 OPTICS DUST FILTER ...................................................................3-35
3.5.7 SCANNER HP SENSOR.................................................................3-36
3.5.8 SCANNER MOTOR.........................................................................3-37
3.5.9 SCANNER DRIVE WIRES ..............................................................3-38
Preparation .........................................................................................3-38
Front, Rear Scanner Drive Wires ........................................................3-39
Reinstallation ......................................................................................3-39
3.5.10 SIB .............................................................................................3-41
3.6 LASER UNIT ............................................................................................3-42
3.6.1 CAUTION DECALS .........................................................................3-42
3.6.2 LD UNIT ..........................................................................................3-43
3.6.3 POLYGON MIRROR MOTOR .........................................................3-45
3.6.4 LASER SYNCHRONIZATION DETECTOR ....................................3-46
3.7 AROUND THE DRUM ..............................................................................3-47
3.7.1 CLEANING UNIT, PCU, DRUM.......................................................3-47
Re-installing the Drum ........................................................................3-48
3.7.2 PTL (PRE-TRANSFER LAMP) ........................................................3-49
3.7.3 PRE-CHARGE UNIT .......................................................................3-50
3.7.4 CHARGE CORONA UNIT ...............................................................3-52
3.7.5 DRUM POTENTIAL SENSOR.........................................................3-55
3.7.6 PICK-OFF PAWLS ..........................................................................3-56
3.7.7 ID SENSOR.....................................................................................3-57
3.7.8 CLEANING BRUSH.........................................................................3-59
3.7.9 CLEANING BLADES .......................................................................3-60
3.7.10 CLEANING UNIT FILTERS .......................................................3-61
3.7.11 TONER FILTER .........................................................................3-62
3.7.12 QUENCHING LAMP SHIELD GLASS .......................................3-63
3.8 DEVELOPMENT AND TONER SUPPLY .................................................3-64
3.8.1 DEVELOPMENT UNIT REMOVAL..................................................3-64
Re-installing the Development Unit.....................................................3-65
3.8.2 TONER HOPPER REMOVAL .........................................................3-66
3.8.3 DEVELOPER REPLACEMENT.......................................................3-67
Initializing the TD Sensor ....................................................................3-70
3.8.4 CLEANING THE DOCTOR BLADE.................................................3-71
3.8.5 DEVELOPMENT ENTRANCE, FRONT, REAR SIDE SEALS........3-74
3.8.6 TONER DENSITY SENSOR ...........................................................3-75
B234/B235/B236/D101/D102/D103 vi SM