SM v D017/D018/D019/D020
3.4 LASER UNIT ............................................................................................3-16
3.4.1 CAUTION DECAL LOCATIONS......................................................3-16
3.4.2 LASER UNIT ...................................................................................3-16
3.4.3 POLYGON MIRROR MOTOR .........................................................3-19
3.4.4 LD UNIT ..........................................................................................3-19
3.4.5 LASER SYNCHRONIZATION DETECTOR.....................................3-20
3.5 PHOTOCONDUCTOR UNIT (PCU) .........................................................3-21
3.5.1 PCU REMOVAL ..............................................................................3-21
3.5.2 PICK-OFF PAWLS ..........................................................................3-22
3.5.3 OPC DRUM .....................................................................................3-22
3.5.4 CHARGE ROLLER, CLEANING ROLLER ......................................3-23
3.5.5 CLEANING BLADE .........................................................................3-24
3.5.6 DEVELOPER...................................................................................3-24
3.5.7 AFTER REPLACEMENT OF PCU COMPONENTS........................3-29
3.6 TRANSFER UNIT .....................................................................................3-31
3.6.1 TRANSFER ROLLER UNIT.............................................................3-31
3.6.2 IMAGE DENSITY SENSOR ............................................................3-32
3.7 FUSING/EXIT ...........................................................................................3-33
3.7.1 FUSING UNIT..................................................................................3-33
3.7.2 THERMISTORS ..............................................................................3-34
3.7.3 THERMOSTATS .............................................................................3-34
3.7.4 HOT ROLLER AND FUSING LAMPS .............................................3-36
3.7.5 PRESSURE ROLLER/CLEANING ROLLER ...................................3-38
3.7.6 PAPER EXIT SENSOR/PAPER OVERFLOW SENSOR.................3-39
3.8 PAPER FEED...........................................................................................3-40
3.8.1 FEED ROLLER: TRAY 1 .................................................................3-40
3.8.2 FEED ROLLER: TRAY 2 .................................................................3-41
3.8.3 FRICTION PAD ...............................................................................3-41
3.8.4 PAPER END SENSOR....................................................................3-42
3.8.5 PAPER TRAY LIFT MOTORS.........................................................3-42
3.8.6 REGISTRATION CLUTCH ..............................................................3-43
3.8.7 PAPER FEED CLUTCHES..............................................................3-44
Lower Paper Feed Clutch ...................................................................3-44
Upper Paper Feed Clutch ...................................................................3-44
3.8.8 RELAY CLUTCHES ........................................................................3-45
3.8.9 UPPER/LOWER PAPER SIZE SENSORS......................................3-46
3.8.10 REGISTRATION SENSOR ........................................................3-46
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