ii
3. REPLACEMENT AND ADJUSTMENT........................................ 3-1
3.1 SPECIAL TOOLS................................................................................ 3-1
3.2 IMAGE ADJUSTMENT ............................................................................. 3-2
3.2.1 REGISTRATION .............................................................................. 3-2
Image Area........................................................................................... 3-2
Leading Edge ....................................................................................... 3-2
Side to Side.......................................................................................... 3-2
Adjustment Standard............................................................................ 3-2
Paper Registration Standard................................................................ 3-2
Adjustment Procedure.......................................................................... 3-3
3.2.2 COLOR REGISTRATION ................................................................ 3-3
Line Position Adjustment...................................................................... 3-3
Adjustment of Line Speed for Thick Paper........................................... 3-3
3.2.3 PRINTER GAMMA........................................................................... 3-4
Adjustment Overview ........................................................................... 3-4
Adjustment Procedure.......................................................................... 3-4
3.3 EXTERIOR COVERS ............................................................................... 3-5
3.3.1 REAR COVER AND UPPER REAR COVER................................... 3-5
3.3.2 PAPER EXIT TRAY ......................................................................... 3-5
3.3.3 UPPER RIGHT COVER................................................................... 3-5
3.3.4 FRONT COVER............................................................................... 3-6
3.3.5 LEFT COVER AND REAR LEFT COVER........................................ 3-6
3.3.6 UPPER LEFT COVER AND OPERATION PANEL.......................... 3-7
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.............. 3-12
3.4.3 POLYGON MIRROR MOTOR ....................................................... 3-13
3.4.4 LASER SYNCHRONIZING DETECTOR BOARDS ....................... 3-13
3.5 PCU AND DEVELOPMENT UNIT .......................................................... 3-14
3.6 PAPER FEED ......................................................................................... 3-15
3.6.1 PICK-UP, FEED, AND SEPARATION ROLLERS.......................... 3-15
Tray 1 and Tray 2............................................................................... 3-15
By-pass Tray...................................................................................... 3-15
3.6.2 PAPER WIDTH DETECTION BOARD........................................... 3-16
3.6.3 VERTICAL TRANSPORT SENSOR .............................................. 3-17
3.6.4 RIGHT DOOR UNIT....................................................................... 3-17
3.6.5 REGISTRATION SENSOR AND RELAY SENSORS .................... 3-18
3.6.6 PAPER FEED CLUTCHES............................................................ 3-18
3.6.7 BY-PASS FEED CLUTCH ............................................................. 3-19
3.6.8 TRAY LIFT MOTOR....................................................................... 3-19
3.6.9 PAPER FEED MOTOR.................................................................. 3-20
3.7 TRANSFER AND PAPER TRANSPORT UNIT ...................................... 3-21
3.7.1 TRANSFER UNIT .......................................................................... 3-21
3.7.2 TRANSFER BELT CLEANING UNIT ............................................. 3-22
3.7.3 CLEANING BLADE AND CLEANING ROLLER............................. 3-23
3.7.4 TRANSFER BELT.......................................................................... 3-25
3.7.5 TRANSFER UNIT DRIVE MOTOR ................................................ 3-27