Ricoh B121 Service Manual page 16

3.8.7 BY-PASS PAPER SIZE SWITCH ...................................................3-31
3.8.8 REGISTRATION CLUTCH .............................................................3-31
3.8.9 REGISTRATION SENSOR.............................................................3-32
3.8.10 UPPER PAPER FEED CLUTCH AND BY-PASS FEED CLUTCH3-32
3.8.11 RELAY CLUTCH ..........................................................................3-33
3.8.12 RELAY SENSOR..........................................................................3-33
3.8.13 LOWER PAPER FEED CLUTCH (TWO-TRAY MODELS ONLY) 3-33
3.8.14 VERTICAL TRANSPORT SENSOR
(TWO-TRAY MODELS ONLY) .....................................................3-34
3.8.15 PAPER SIZE SWITCH .................................................................3-34
3.9 IMAGE TRANSFER.................................................................................3-35
3.9.1 IMAGE TRANSFER ROLLER ........................................................3-35
3.9.2 IMAGE DENSITY SENSOR ...........................................................3-35
3.10 FUSING .................................................................................................3-36
3.10.1 FUSING UNIT...............................................................................3-36
3.10.2 THERMISTOR ..............................................................................3-36
3.10.3 FUSING LAMPS ...........................................................................3-37
3.10.4 HOT ROLLER STRIPPER PAWLS ..............................................3-37
3.10.5 HOT ROLLER...............................................................................3-38
3.10.6 THERMOSTAT .............................................................................3-38
3.10.7 PRESSURE ROLLER AND BUSHINGS ......................................3-39
3.10.8 NIP BAND WIDTH ADJUSTMENT ...............................................3-41
3.10.9 CLEANING ROLLER ....................................................................3-41
3.11 DUPLEX UNIT (DUPLEX MODELS ONLY) ..........................................3-42
3.11.1 DUPLEX EXIT SENSOR ..............................................................3-42
3.11.2 DUPLEX ENTRANCE SENSOR...................................................3-42
3.11.3 DUPLEX INVERTER SENSOR ....................................................3-43
3.11.4 DUPLEX TRANSPORT MOTOR ..................................................3-44
3.11.5 DUPLEX INVERTER MOTOR ......................................................3-44
3.11.6 DUPLEX CONTROL BOARD .......................................................3-44
3.12 OTHER REPLACEMENTS....................................................................3-45
3.12.1 QUENCHING LAMP .....................................................................3-45
3.12.2 HIGH-VOLTAGE POWER SUPPLY BOARD ...............................3-45
3.12.3 BICU (BASE-ENGINE IMAGE CONTROL UNIT) .........................3-46
3.12.4 MAIN MOTOR ..............................................................................3-46
3.12.5 REAR EXHAUST FAN (B123 ONLY) ...........................................3-47
3.12.6 LEFT EXHAUST FAN...................................................................3-47
3.12.7 PSU (POWER SUPPLY UNIT) .....................................................3-47
3.12.8 GEARBOX....................................................................................3-48
Replacement Procedure .....................................................................3-48
Gear Arrangement in the Gearbox......................................................3-50
3.13 COPY ADJUSTMENTS: PRINTING/SCANNING ..................................3-51
3.13.1 PRINTING ....................................................................................3-51
Registration - Leading Edge/Side-to-Side...........................................3-51
Blank Margin.......................................................................................3-52
Main Scan Magnification.....................................................................3-52
3.13.2 SCANNING...................................................................................3-53
Registration: Platen Mode...................................................................3-53
Magnification.......................................................................................3-53
B121/B122/B123 iv SM