1-6-15 Removing the scanner motor ............................................................................................................. 1-6-37

1-6-16 Removing the main charger unit ........................................................................................................ 1-6-40

1-6-17 Adjustment the maintenance mode .................................................................................................... 1-6-41

(1) Adjusting the leading edge registration of image printing ............................................................. 1-6-41

(2) Adjusting the center line of image printing .................................................................................... 1-6-42

(3) Adjusting the amount of slack in the paper ................................................................................... 1-6-43

(4) Adjusting magnification of the scanner in the main scanning direction ........................................ 1-6-44

(5) Adjusting magnification of the scanner in the auxiliary scanning direction ................................... 1-6-45

(6) Adjusting the scanner leading edge registration ........................................................................... 1-6-46

(7) Adjusting the scanner center line ................................................................................................. 1-6-47

(8) Adjusting the margins for scanning an original on the contact glass ............................................ 1-6-48

(9) Adjusting the DP magnification ..................................................................................................... 1-6-49

(10) Adjusting the DP leading edge registration .................................................................................. 1-6-50

(11) Adjusting the DP trailing edge registration ................................................................................... 1-6-51

(12) Adjusting the DP center line ......................................................................................................... 1-6-52

(13) Adjusting the margins for scanning the original from the DP ........................................................ 1-6-53

1-7 Upgrading the firmware

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

2-1 Mechanical construction

2-1-1 Paper feeding system .......................................................................................................................... 2-1-1

(1) Paper feed control .......................................................................................................................... 2-1-2

(2) Paper feeding mechanism .............................................................................................................. 2-1-3

2-1-2 Original scanning system ..................................................................................................................... 2-1-4

(1) ISU unit ........................................................................................................................................... 2-1-6

2-1-3 Electrophotographic system ................................................................................................................. 2-1-7

(1) Electrophotographic cycle .............................................................................................................. 2-1-7

(1-1) Process unit mechanism ....................................................................................................... 2-1-8

(2) Main charging ................................................................................................................................. 2-1-9

(2-1) Photo conductive drum .......................................................................................................... 2-1-9

(2-2) Charging the drum ............................................................................................................... 2-1-10

(3) Exposure ...................................................................................................................................... 2-1-11

(3-1) Laser scanner unit ............................................................................................................... 2-1-12

(3-2) Drum surface potential ........................................................................................................ 2-1-13

(4) Development ................................................................................................................................ 2-1-14

(5) Transfer ........................................................................................................................................ 2-1-15

(6) Fusing ........................................................................................................................................... 2-1-16

(6-1) Fuser unit mechanism ......................................................................................................... 2-1-17

(7) Cleaning ....................................................................................................................................... 2-1-18

2-2 Electrical Parts Layout

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

(1) Main unit ......................................................................................................................................... 2-2-1

(2) Scanner unit ................................................................................................................................... 2-2-2

2-3 Operation of the PWBs

2-3-1 Main PWB ............................................................................................................................................ 2-3-1

2-3-2 Engine PWB ......................................................................................................................................... 2-3-7

(1) Eraser lamp control circuit .............................................................................................................. 2-3-9

(2) Heater lamp control circuit ............................................................................................................ 2-3-10

(3) Polygon motor control circuit ........................................................................................................ 2-3-13

2-3-3 Power supply PWB ............................................................................................................................ 2-3-17

2-3-4 Bias PWB ........................................................................................................................................... 2-3-19

2-3-5 High voltage PWB .............................................................................................................................. 2-3-20

(1) Interlock switch ............................................................................................................................. 2-3-21

1-1-3

2GM

Table of Contents