1-6-4 Drum section ...................................................................................................................................... 1-6-32

(1) Detaching and refitting the drum unit............................................................................................ 1-6-32

(2) Detaching and refitting the main charger unit............................................................................... 1-6-32

(3) Detaching and refitting the drum separation claw assemblies..................................................... 1-6-33

1-6-5 Developing section ............................................................................................................................. 1-6-34

(1) Detaching and refitting the developing unit .................................................................................. 1-6-34

1-6-6 Transfer section ................................................................................................................................. 1-6-35

(1) Detaching and refitting the transfer roller assembly..................................................................... 1-6-35

1-6-7 Fixing section ..................................................................................................................................... 1-6-36

(1) Detaching and refitting the fixing unit ........................................................................................... 1-6-36

(2) Detaching and refitting the heat roller separation claws............................................................... 1-6-36

(3) Detaching and refitting the press roller......................................................................................... 1-6-37

(4) Detaching and refitting the fixing heater M and S......................................................................... 1-6-38

(5) Detaching and refitting the heat roller........................................................................................... 1-6-39

(6) Detaching and refitting the fixing unit thermistor 1 and 2............................................................. 1-6-40

(7) Adjusting front position of the fixing unit (adjusting lateral squareness) ....................................... 1-6-41

1-6-8 Others ................................................................................................................................................ 1-6-42

(1) Detaching and refitting the ozone filters (only for 230 V specifications)....................................... 1-6-42

1-7 Requirements on PCB Replacement

1-7-1 Upgrading the firmware on the main PCB............................................................................................ 1-7-1

1-7-2 Adjustment-free variable resisters (VR)............................................................................................... 1-7-2

1-7-3 Remarks on main PCB replacement.................................................................................................... 1-7-2

1-7-4 Upgrading the the printer board firmware ............................................................................................ 1-7-3

2-1 Mechanical construction

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

2-1-2 Main charging section .......................................................................................................................... 2-1-5

2-1-3 Optical section...................................................................................................................................... 2-1-7

(1) Original scanning............................................................................................................................ 2-1-8

(2) Image printing ................................................................................................................................. 2-1-9

2-1-4 Developing section ............................................................................................................................. 2-1-12

(1) Formation of magnetic brush........................................................................................................ 2-1-13

(2) Computing the absolute humidity ................................................................................................. 2-1-14

(3) Single component developing system.......................................................................................... 2-1-15

2-1-5 Transfer and separation sections....................................................................................................... 2-1-17

2-1-6 Cleaning and charge erasing sections............................................................................................... 2-1-19

2-1-7 Fixing section ..................................................................................................................................... 2-1-20

2-1-8 Eject and switchback sections............................................................................................................ 2-1-22

2-1-9 Duplex section.................................................................................................................................... 2-1-24

(1) Paper conveying operation in duplex copying.............................................................................. 2-1-25

2-2 Electrical Parts Layout

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

(1) PCBs .............................................................................................................................................. 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 PCBs

2-3-1 Power source PCB ............................................................................................................................... 2-3-1

2-3-2 Main PCB ............................................................................................................................................. 2-3-5

2-3-3 Operation unit PCB ............................................................................................................................ 2-3-17

2-3-4 Scanner drive PCB............................................................................................................................. 2-3-22

2-3-5 CCD PCB ........................................................................................................................................... 2-3-25

1-1-4

Table of Contents