1-5-2 Paper feed section ..................................................................................................................................1-5-3

(1) Detaching and refitting the separation pulley ....................................................................................1-5-3

(2) Detaching and refitting the forwarding pulley and paper feed pulley.................................................1-5-6

(3) Detaching and refitting the paper conveying unit ..............................................................................1-5-9

(4) Detaching and refitting the MP paper feed pulley and MP separation pad .....................................1-5-11

(5) Detaching and refitting the left registration roller.............................................................................1-5-14

(6) Detaching and refitting the right registration roller...........................................................................1-5-15

1-5-3 Optical section ......................................................................................................................................1-5-17

(1) Detaching and refitting the exposure lamp......................................................................................1-5-17

(2) Detaching and refitting the scanner wires .......................................................................................1-5-19

(2-1) Detaching the scanner wires ...................................................................................................1-5-19

(2-2) Fitting the scanner wires .........................................................................................................1-5-22

(3) Detaching and refitting the ISU (reference).....................................................................................1-5-26

(4) Detaching and refitting the laser scanner unit .................................................................................1-5-28

(5) Adjusting the longitudinal squareness (reference) ..........................................................................1-5-33

1-5-4 Drum section.........................................................................................................................................1-5-34

(1) Detaching and refitting the drum unit ..............................................................................................1-5-34

(2) Detaching and refitting the drum separation claws .........................................................................1-5-35

(3) Detaching and refitting the main charger unit..................................................................................1-5-36

1-5-5 Developing section................................................................................................................................1-5-37

(1) Detaching and refitting the developing unit .....................................................................................1-5-37

1-5-6 Transfer section ....................................................................................................................................1-5-38

(1) Detaching and refitting the transfer roller ........................................................................................1-5-38

1-5-7 Fuser section ........................................................................................................................................1-5-40

(1) Detaching and refitting the fuser unit...............................................................................................1-5-40

(2) Detaching and refitting the press roller............................................................................................1-5-42

(3) Detaching and refitting the fuser heater ..........................................................................................1-5-44

(4) Detaching and refitting the heat roller separation claws..................................................................1-5-47

(5) Detaching and refitting the heat roller .............................................................................................1-5-48

(6) Detaching and refitting the fuser thermistor ....................................................................................1-5-50

(7) Detaching and refitting the fuser thermostat ...................................................................................1-5-51

(8) Adjusting front position of the fuser unit (adjusting lateral squareness) ..........................................1-5-52

1-5-8 Others ...................................................................................................................................................1-5-53

(1) Detaching and refitting the eject unit ...............................................................................................1-5-53

(2) Direction of installing the principal fan motors.................................................................................1-5-55

1-6 Requirements on PWB Replacement

1-6-1 Upgrading the firmware...........................................................................................................................1-6-1

1-6-2 Adjustment-free variable resistors (VR) ..................................................................................................1-6-2

1-6-3 Remarks on main/engine PWB replacement ..........................................................................................1-6-2

1-6-4 Upgrading the printing system firmware .................................................................................................1-6-3

(1) Upgrade using PC/USB.....................................................................................................................1-6-3

(2) Upgrade using DIMM ........................................................................................................................1-6-3

2-1 Mechanical construction

2-1-1 Paper feed section ..................................................................................................................................2-1-1

2-1-2 Optical section ........................................................................................................................................2-1-3

(1) Image scanner section ......................................................................................................................2-1-3

(2) Laser scanner section .......................................................................................................................2-1-5

2-1-3 Drum section...........................................................................................................................................2-1-7

2-1-4 Developing section..................................................................................................................................2-1-9

(1) Single component developing system.............................................................................................2-1-11

2-1-5 Transfer and separation sections..........................................................................................................2-1-12

2-1-6 Fuser section ........................................................................................................................................2-1-13

2-1-7 Eject and switchback sections ..............................................................................................................2-1-15

2-1-8 Duplex section ......................................................................................................................................2-1-17

2-2 Electrical Parts Layout

2-2-1 Electrical parts layout..............................................................................................................................2-2-1

(1) PWBs ................................................................................................................................................2-2-1

(2) Switches and sensors .......................................................................................................................2-2-3

(3) Motors ...............................................................................................................................................2-2-4

Table of Contents