Service manual

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3.4 LASER OPTICS ........................................................................................3-8
3.4.1 CAUTION DECAL LOCATIONS.......................................................3-8
3.4.2 LASER OPTICS HOUSING UNIT ....................................................3-9
Adjustments after Replacing the Laser Optics Housing Unit...............3-11
3.4.3 POLYGON MIRROR MOTOR ........................................................3-12
3.4.4 LASER SYNCHRONIZING DETECTOR BOARDS ........................3-12
3.5 PCU AND DEVELOPMENT UNIT...........................................................3-13
3.6 PAPER FEED..........................................................................................3-14
3.6.1 PICK-UP, FEED, AND SEPARATION ROLLERS ..........................3-14
Tray 1 and Tray 2 ...............................................................................3-14
By-pass Tray.......................................................................................3-14
3.6.2 PAPER WIDTH DETECTION BOARD ...........................................3-15
3.6.3 VERTICAL TRANSPORT SENSOR...............................................3-15
3.6.4 RIGHT DOOR UNIT .......................................................................3-16
3.6.5 REGISTRATION SENSOR AND RELAY SENSOR .......................3-17
3.6.6 PAPER FEED CLUTCHES.............................................................3-17
3.6.7 BY-PASS FEED CLUTCH..............................................................3-18
3.6.8 TRAY LIFT MOTOR .......................................................................3-18
3.7 TRANSFER AND PAPER TRANSPORT UNIT .......................................3-19
3.7.1 TRANSFER UNIT...........................................................................3-19
3.7.2 TRANSFER BELT CLEANING UNIT..............................................3-21
3.7.3 CLEANING BLADE AND CLEANING ROLLER .............................3-22
3.7.4 TRANSFER BELT ..........................................................................3-23
3.7.5 OTHERS.........................................................................................3-27
Front Plate ..........................................................................................3-27
Grounding Spring................................................................................3-27
Drive Gear and Left Drive Roller.........................................................3-27
3.8 FUSING...................................................................................................3-28
3.8.1 FUSING UNIT.................................................................................3-28
3.8.2 OIL SUPPLY UNIT .........................................................................3-29
3.8.3 UPPER COVER .............................................................................3-29
3.8.4 FUSING BELT UNIT.......................................................................3-30
3.8.5 PRESSURE ROLLER.....................................................................3-33
3.8.6 PAPER EXIT ..................................................................................3-35
3.9 ELECTRICAL COMPONENTS................................................................3-36
3.9.1 MOVING THE CONTROLLER BOX OUT OF THE WAY ...............3-36
3.9.2 MOVING THE HIGH VOLTAGE SUPPLY UNIT -
C, B OUT OF THE WAY.................................................................3-36
3.9.3 CONTROLLER AND BCU..............................................................3-37
3.9.4 NVRAM REPLACEMENT PROCEDURE.......................................3-38
NVRAM for BCU.................................................................................3-38
NVRAM for Controller.........................................................................3-38
NVRAMs for both BCU and Controller................................................3-38
3.9.5 REMOVING THE HIGH VOLTAGE SUPPLY BOARD - C, B .........3-39
3.9.6 PSU ................................................................................................3-39
3.10 DRIVE UNIT ..........................................................................................3-40
3.10.1 REGISTRATION CLUTCH ...........................................................3-40
DEVELOPMENT CLUTCHES ............................................................3-41
3.10.3 DEVELOPMENT DRIVE MOTOR - CMY .....................................3-42