(19) Image is not square.........................................................................................................................1-4-57

(20) There is a regular error between the centers of the original and copy image

when the DP is used. ......................................................................................................................1-4-58

(21) There is a regular error between the leading edges of the original and copy image

when the DP is used. ......................................................................................................................1-4-58

(22) A line appears at the leading or trailing edge. .................................................................................1-4-58

(23) A line appears at the leading or trailing edge. .................................................................................1-4-58

1-4-4 Electric problems ..................................................................................................................................1-4-59

1-4-5 Mechanical problems ............................................................................................................................1-4-74

1-5 Assembly and Disassembly

1-5-1 Precautions for assembly and disassembly............................................................................................1-5-1

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

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

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

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

(1) Detaching and refitting the paper feed pulley, forwarding pulley and separation pulley of

cassette 1 and 2 ................................................................................................................................1-5-3

(2) Detaching and refitting the paper feed pulley, forwarding pulley and separation pulley of

cassette 3 and 4 ..............................................................................................................................1-5-10

(3) Pressure adjustment of separation pulley (reference).....................................................................1-5-14

(4) Adjusting the center line for cassette 1 or 2 ....................................................................................1-5-15

(5) Detaching and refitting the MP unit .................................................................................................1-5-17

(6) Detaching and refitting the MP paper feed pulley, MP forwarding pulley and

MP separation pulley.......................................................................................................................1-5-19

(7) Pressure adjustment of MP separation pulley.................................................................................1-5-24

1-5-3 Main charging section ...........................................................................................................................1-5-25

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

(2) Detaching and refitting the main charger grid .................................................................................1-5-26

(3) Detaching the main charger wire cleaning pad ...............................................................................1-5-26

(4) Detaching and refitting the main charger wire.................................................................................1-5-27

1-5-4 Optical section ......................................................................................................................................1-5-28

(1) Detaching and refitting the exposure lamp......................................................................................1-5-28

(2) Detaching and refitting the scanner wires .......................................................................................1-5-31

(2-1) Detaching the scanner wires ...................................................................................................1-5-31

(2-2) Fitting the scanner wires .........................................................................................................1-5-33

(3) Detaching the laser scanner unit.....................................................................................................1-5-36

(4) Detaching and refitting the ISU (reference).....................................................................................1-5-39

(5) Adjusting the longitudinal squareness (reference) ..........................................................................1-5-41

(6) Adjusting scanner image lateral squareness (reference) ................................................................1-5-42

(6-1) Adjusting the position of the laser scanner unit.......................................................................1-5-42

(6-2) Adjusting the position of the ISU .............................................................................................1-5-43

1-5-5 Drum section.........................................................................................................................................1-5-44

(1) Detaching and refitting the drum .....................................................................................................1-5-44

(2) Detaching and refitting the drum heater ..........................................................................................1-5-45

(3) Detaching and refitting the drum heater electrode ..........................................................................1-5-47

1-5-6 Developing section................................................................................................................................1-5-48

(1) Detaching and refitting the developing unit .....................................................................................1-5-48

1-5-7 Transfer section ....................................................................................................................................1-5-49

(1) Detaching and refitting the transfer unit ..........................................................................................1-5-49

(2) Detaching and refitting the transfer belt ..........................................................................................1-5-51

(3) Detaching and refitting the transfer roller ........................................................................................1-5-53

1-5-8 Cleaning section ...................................................................................................................................1-5-54

(1) Detaching and refitting the cleaning unit .........................................................................................1-5-54

(2) Detaching and refitting the cleaning blade ......................................................................................1-5-55

1-5-9 Charge erasing section .........................................................................................................................1-5-56

(1) Detaching and refitting the PTC unit ...............................................................................................1-5-56

(2) Detaching and refitting the PTC cleaning pad.................................................................................1-5-56

(3) Detaching and refitting the PTC wire...............................................................................................1-5-57

1-5-10 Fuser section ........................................................................................................................................1-5-58

(1) Detaching and refitting the fuser unit...............................................................................................1-5-58

(2) Detaching and refitting the lower cleaning roller .............................................................................1-5-59

Table of Contents