(1) Precautions .......................................................................................................................................1-5-1

(2) Drum..................................................................................................................................................1-5-1

(3) Toner .................................................................................................................................................1-5-1

(4) Running a maintenance item.............................................................................................................1-5-2

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.................................................1-5-5

(3) Detaching and refitting the paper conveying unit ..............................................................................1-5-7

(4) Detaching and refitting the MP paper feed pulley and MP separation pad .......................................1-5-9

(5) Detaching and refitting the registration left roller.............................................................................1-5-11

(6) Detaching and refitting the registration cleaner...............................................................................1-5-11

1-5-3 Optical section ......................................................................................................................................1-5-12

(1) Detaching and refitting the exposure lamp......................................................................................1-5-12

(2) Detaching and refitting the scanner wires .......................................................................................1-5-13

(2-1) Detaching the scanner wires ...................................................................................................1-5-13

(2-2) Fitting the scanner wires .........................................................................................................1-5-15

(3) Detaching and refitting the ISU (reference).....................................................................................1-5-18

(4) Detaching and refitting the laser scanner unit .................................................................................1-5-19

(5) Adjusting the longitudinal squareness (reference) ..........................................................................1-5-22

1-5-4 Drum section.........................................................................................................................................1-5-23

(1) Detaching and refitting the drum unit ..............................................................................................1-5-23

(2) Detaching and refitting the drum separation claws .........................................................................1-5-24

(3) Detaching and refitting the main charger unit..................................................................................1-5-25

1-5-5 Developing section................................................................................................................................1-5-26

(1) Detaching and refitting the developing unit ....................................................................................1-5-26

1-5-6 Transfer section ....................................................................................................................................1-5-27

(1) Detaching and refitting the transfer roller ........................................................................................1-5-27

1-5-7 Fuser section ........................................................................................................................................1-5-28

(1) Detaching and refitting the fuser unit...............................................................................................1-5-28

(2) Detaching and refitting the press roller............................................................................................1-5-30

(3) Detaching and refitting the fuser heater M and S............................................................................1-5-31

(4) Detaching and refitting the heat roller separation claws..................................................................1-5-32

(5) Detaching and refitting the heat roller .............................................................................................1-5-33

(6) Detaching and refitting the fuser thermostat ...................................................................................1-5-34

(7) Detaching and refitting the fuser thermistor ....................................................................................1-5-34

(8) Adjusting the fuser unit height (adjusting lateral squareness).........................................................1-5-35

1-6 Requirements on PWB Replacement

1-6-1 Upgrading the firmware on the main PWB..............................................................................................1-6-1

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

1-6-3 Remarks on PWBs replacement.............................................................................................................1-6-2

2-1 Mechanical construction

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

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

(1) Original scanning...............................................................................................................................2-1-4

(2) Image printing....................................................................................................................................2-1-5

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

2-1-4 Developing section..................................................................................................................................2-1-8

(1) Formation of magnetic brush.............................................................................................................2-1-9

(2) Single component developing system.............................................................................................2-1-10

2-1-5 Transfer and separation sections..........................................................................................................2-1-11

2-1-6 Fuser section ........................................................................................................................................2-1-12

2-1-7 Exit and switchback sections ................................................................................................................2-1-13

2-1-8 Duplex section ......................................................................................................................................2-1-14

(1) Paper conveying operation in duplex copying.................................................................................2-1-15

Table of Contents