1-5-3 Optical section ......................................................................................................................................1-5-11

(1) Detaching and refitting the exposure lamp......................................................................................1-5-11

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

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

(4) Adjusting the position of the ISU (reference)...................................................................................1-5-20

(5) Detaching and refitting the laser scanner unit .................................................................................1-5-21

(6) Adjusting the skew of the laser scanner unit (reference) ................................................................1-5-23

1-5-4 Drum section.........................................................................................................................................1-5-24

(1) Detaching and refitting the drum unit ..............................................................................................1-5-24

(2) 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 unit .................................................................................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 heat roller separation claws..................................................................1-5-29

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

(4) Detaching and refitting the fuser heater ..........................................................................................1-5-31

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

(6) Detaching and refitting the fuser unit thermistor 1 and 2.................................................................1-5-33

(7) Adjusting front position of the fuser unit (adjusting lateral squareness) ..........................................1-5-34

1-5-8 Others ...................................................................................................................................................1-5-35

(1) Detaching and refitting the ozone filter 1 and 2...............................................................................1-5-35

(2) Detaching and refitting the dust filter 1 and 2..................................................................................1-5-36

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 PWB replacement......................................................................................................1-6-2

1-6-4 Remarks on scanner PWB replacement.................................................................................................1-6-2

2-1 Mechanical construction

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

2-1-2 Main charging section .............................................................................................................................2-1-4

2-1-3 Optical section ........................................................................................................................................2-1-5

(1) Original scanning...............................................................................................................................2-1-6

(2) Image printing....................................................................................................................................2-1-7

2-1-4 Developing section................................................................................................................................2-1-10

(1) Single component developing system.............................................................................................2-1-12

2-1-5 Transfer and separation sections..........................................................................................................2-1-13

2-1-6 Cleaning and charge erasing sections..................................................................................................2-1-14

2-1-7 Fuser section ........................................................................................................................................2-1-15

2-1-8 Eject and switchback sections ..............................................................................................................2-1-16

2-1-9 Duplex section ......................................................................................................................................2-1-17

(1) Paper conveying operation in duplex copying.................................................................................2-1-18

2-2 Electrical Parts Layout

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

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

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

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

(4) Other electrical components..............................................................................................................2-2-5

2-3 Operation of the PWBs

2-3-1 Power source PWB.................................................................................................................................2-3-1

2-3-2 Engine PWB............................................................................................................................................2-3-5

Table of Contents