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Chapter 6
6-1
6.1 Construction
6.1.1 Overview
0015-4421
iR5065 / iR 5055 / iR5075 / / /
The machine's laser exposure system consists of the laser unit that serves as the source of light and the laser scanning unit that uses a polygon mirror to control the
beam of laser light (for main scanning direction).
1) The video signal from the controller block is converted into a laser drive signal by the video PCB, and is sent to the laser drive PCB. The laser drive signal is
used to turn on the laser unit for generation of a laser beam.
2) The laser beam will assume a specific scanning direction upon hitting the polygon mirror rotating at a high speed.
3) The surface of the photosensitive drum is charged to a positive potential. When the laser beam hits specific areas of the drum surface, a static image occurs as a
result.
In addition, the laser beam is also used for blank exposure applied to non-imaging areas.
T-6-1
6.1.2 Major Components
0015-4422
iR5065 / iR 5055 / iR5075 / / /
The machine's laser exposure system consists of the following major components:
The machine uses a small-diameter 12-facet polygon mirror and a wide-area lens to enable scanning at high speed, at low power consumption, and at low operating
noise. The laser unit is a double-beam unit.
F-6-1
T-6-2
6.2 Basic Sequence
6.2.1 Basic Sequence of Operation (laser exposure)
0015-4424
iR5065 / iR 5055 / iR5075 / / /
Item
Description
Laser intensity control
[1] laser power auto control (APC control)
[2] optimum intensity control to suit drum surface potential
Laser scanning method
scanning by semi-conductor laser
synchronization control
main scanning direction: control by BD signal
sub scanning direction: controlled by laser write start signal
Laser scanner motor control
[1] constant speed rotation control
[2] full/standby speed switchover
Item
Description
Laser semi-conductor
visible laser light (about 660 nm), double beam
Laser scanner motor
DC motor, 2-speed control (at full speed, about 41338 rpm)
Polygon mirror
12 facets
BD mirror/BD PCB
laser beam detection
laser driver PCB
Laser activation control
Video PCB
laser scanner motor rotation control
Polygon mirror
Laser unit
BD mirror
Laser mirror 2
Laser mirror 3
Laser mirror 4
Laser mirror 1
Photosensitive drum
BD PCB
Summary of Contents for imageRUNNER 5065 series
Page 1: ...Feb 26 2007 Service Manual iR5075 5065 5055 Series ...
Page 2: ......
Page 6: ......
Page 27: ...Chapter 1 Introduction ...
Page 28: ......
Page 30: ......
Page 52: ......
Page 53: ...Chapter 2 Installation ...
Page 54: ......
Page 98: ...Chapter 2 2 42 ...
Page 99: ...Chapter 3 Basic Operation ...
Page 100: ......
Page 102: ......
Page 108: ......
Page 109: ...Chapter 4 Main Controller ...
Page 110: ......
Page 112: ......
Page 129: ...Chapter 5 Original Exposure System ...
Page 130: ......
Page 162: ......
Page 163: ...Chapter 6 Laser Exposure ...
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Page 173: ...Chapter 7 Image Formation ...
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Page 211: ...Chapter 8 Pickup Feeding System ...
Page 212: ......
Page 263: ...Chapter 9 Fixing System ...
Page 264: ......
Page 268: ......
Page 307: ...Chapter 10 External and Controls ...
Page 308: ......
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Page 321: ...Chapter 10 10 9 F 10 8 ...
Page 345: ...Chapter 11 MEAP ...
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Page 389: ...Chapter 12 RDS ...
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Page 399: ...Chapter 13 Maintenance and Inspection ...
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Page 411: ...Chapter 14 Standards and Adjustments ...
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Page 441: ...Chapter 15 Correcting Faulty Images ...
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Page 471: ...Chapter 16 Self Diagnosis ...
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Page 493: ...Chapter 17 Service Mode ...
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Page 553: ...Chapter 18 Upgrading ...
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Page 572: ...Chapter 18 18 16 F 18 29 2 Click Start F 18 30 3 When the session has ended click OK ...
Page 587: ...Chapter 18 18 31 F 18 59 2 Select the data to download F 18 60 3 Click Start ...
Page 589: ...Chapter 19 Service Tools ...
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Page 595: ...Feb 26 2007 ...
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