Kyocera FS-1050 Service Manual - Page 61

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Chapter 4 Contents 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

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Chapter 4
Contents
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