(1) Precautions .......................................................................................................................................1-6-1

(2) Running a maintenance item.............................................................................................................1-6-2

1-6-2 Paper feed section ..................................................................................................................................1-6-3

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

separation pulley of cassette 1 and 2................................................................................................1-6-3

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

separation pulley of cassette 3 and 4..............................................................................................1-6-10

(3) Pressure adjustment of separation pulley .......................................................................................1-6-14

(4) Adjusting the center line for cassette 1 or 2 ....................................................................................1-6-15

(5) Detaching and refitting the MP unit .................................................................................................1-6-17

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

MP separation pulley.......................................................................................................................1-6-19

(7) Pressure adjustment of MP separation pulley.................................................................................1-6-24

(8) Adjustment after roller and motor replacement ...............................................................................1-6-25

(8-1) Adjusting the leading edge registration of image printing.......................................................1-6-25

(8-2) Adjusting the leading edge registration for duplex switchback copying .................................1-6-26

(8-3) Adjusting the center line of image printing ..............................................................................1-6-27

(8-4) Adjusting the margins for printing...........................................................................................1-6-28

(8-5) Adjusting the amount of slack in the paper ............................................................................1-6-29

(8-6) Adjusting the amount of slack in the paper at the vertical conveying.....................................1-6-30

1-6-3 Main charging section ...........................................................................................................................1-6-31

(1) Detaching and refitting the main charger unit..................................................................................1-6-31

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

(3) Detaching the main charger wire cleaning pad ...............................................................................1-6-32

(4) Detaching and refitting the main charger wire.................................................................................1-6-33

1-6-4 Optical section ......................................................................................................................................1-6-34

(1) Detaching and refitting the exposure lamp......................................................................................1-6-34

(2) Detaching and refitting the scanner wires .......................................................................................1-6-37

(2-1) Detaching the scanner wires ...................................................................................................1-6-37

(2-2) Fitting the scanner wires .........................................................................................................1-6-39

(3) Detaching the laser scanner unit.....................................................................................................1-6-42

(4) Detaching and refitting the ISU (reference).....................................................................................1-6-46

(5) Adjusting the longitudinal squareness (reference) ..........................................................................1-6-48

(6) Adjusting scanner image lateral squareness (reference) ................................................................1-6-49

(6-1) Adjusting the position of the laser scanner unit.......................................................................1-6-49

(6-2) Adjusting the position of the ISU .............................................................................................1-6-50

(7) Adjusting magnification of the scanner in the main scanning direction ...........................................1-6-51

(8) Adjusting magnification of the scanner in the auxiliary scanning direction......................................1-6-52

(9) Adjusting the scanner center line ...................................................................................................1-6-53

(10) Adjusting the scanner leading edge registration ............................................................................1-6-54

(11) Adjusting the margins for scanning an original on the contact glass..............................................1-6-55

1-6-5 Drum section.........................................................................................................................................1-6-56

(1) Detaching and refitting the drum .....................................................................................................1-6-56

(2) Detaching and refitting the drum heater ..........................................................................................1-6-57

(3) Detaching and refitting the drum heater electrode ..........................................................................1-6-59

1-6-6 Developing section................................................................................................................................1-6-60

(1) Detaching and refitting the developing unit .....................................................................................1-6-60

1-6-7 Transfer section ....................................................................................................................................1-6-61

(1) Detaching and refitting the transfer unit ..........................................................................................1-6-61

(2) Detaching and refitting the transfer belt ..........................................................................................1-6-63

(3) Detaching and refitting the transfer roller ........................................................................................1-6-65

1-6-8 Cleaning section ...................................................................................................................................1-6-66

(1) Detaching and refitting the cleaning unit .........................................................................................1-6-66

(2) Detaching and refitting the cleaning blade ......................................................................................1-6-67

1-6-9 Charge erasing section .........................................................................................................................1-6-68

(1) Detaching and refitting the PTC unit ...............................................................................................1-6-68

(2) Detaching and refitting the PTC cleaning pad.................................................................................1-6-68

(3) Detaching and refitting the PTC wire...............................................................................................1-6-69

1-6-10 Fuser section ........................................................................................................................................1-6-70

(1) Detaching and refitting the fuser unit...............................................................................................1-6-70

(2) Detaching and refitting the lower cleaning roller .............................................................................1-6-71

xiv

Service Manual

Y104350-7

Table of Contents