Kyocera FS-1050 - B/W Laser Printer Service Manual page 61

4-1 Electrophotographic system .......................................................................................................... 4-3
4-1-1 Electrophotographic cycle ......................................................................................................... 4-3
Process unit mechanism ........................................................................................................... 4-4
(1) Main charging ...................................................................................................................... 4-5
Photo conductive drum ............................................................................................................. 4-5
Charging the drum .................................................................................................................... 4-6
(2) Exposure ............................................................................................................................. 4-7
Laser scanner unit .................................................................................................................... 4-8
Drum surface potential .............................................................................................................. 4-9
(3) Development ..................................................................................................................... 4-10
(4) Transfer ..............................................................................................................................4-11
(5) Fusing ................................................................................................................................ 4-12
Fuser unit mechanism ............................................................................................................ 4-13
(6) Cleaning ............................................................................................................................ 4-14
4-2 Paper feeding system .................................................................................................................... 4-15
4-2-1 Paper feed control ................................................................................................................... 4-16
Paper feeding mechanism ...................................................................................................... 4-17
4-3 Electrical control system .............................................................................................................. 4-18
4-3-1 Electrical parts layout .............................................................................................................. 4-18
4-3-2 Operation of circuit boards ..................................................................................................... 4-19
(1) Main board ........................................................................................................................ 4-19
(2) Engine board ..................................................................................................................... 4-20
Eraser lamp control circuit ...................................................................................................... 4-21
Polygon motor control circuit .................................................................................................. 4-25
(3) Power supply board ........................................................................................................... 4-26
(4) Bias board ......................................................................................................................... 4-27
(5) High voltage board ............................................................................................................ 4-28
Interlock switch ....................................................................................................................... 4-29
Chapter 4 Contents