2DD
(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 Requirements on PWB Replacement
1-7-1 Upgrading the firmware on the main board .......................................................................................... 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 board ........................................................................................................................................... 2-3-1
2-3-2 Engine board ........................................................................................................................................ 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 board ........................................................................................................................... 2-3-17
2-3-4 Bias board .......................................................................................................................................... 2-3-19
2-3-5 High voltage board ............................................................................................................................. 2-3-20
(1) Interlock switch ............................................................................................................................. 2-3-21
2-3-6 CCD board ......................................................................................................................................... 2-3-22
2-3-7 Operation board ................................................................................................................................. 2-3-24
2-3-8 Scanner board .................................................................................................................................... 2-3-26
2-4 Appendixes
Timing chart No. 1 .......................................................................................................................................... 2-4-1
Timing chart No. 2 .......................................................................................................................................... 2-4-2
Timing chart No. 3 .......................................................................................................................................... 2-4-3
Wiring diagram ............................................................................................................................................... 2-4-4
