Chapter 6
6-9
F-6-10
Bk is used to detect the reference BD signal and, as such, laser light is directed to the surface of the polygon mirror. In other words, the write start position in main
scanning direction for Bk is determined based on actual measurement and, for this reason, the possible presence of variation in the angle of the polygon mirror
surface will not lead to variation of Bk write start position.
The laser driver for C is found directly under the Bk laser driver and, for this reason, the C laser driver directs laser light against the same polygon mirror surface
as the Bk laser driver, eliminating the effects of variation in the angle of the polygon mirror surface. The write start position of C, for this reason, is also free of
variation as in the case of Bk.
6.2.2 Controlling the Intensity of Laser Light
6.2.2.1 APC Control
0013-9608
/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
The machine uses APC control to make sure that the intensity of laser light remains at a specific level.
The machine uses 2 laser driver PCBs, each with a laser driver IC taking care of 2 colors and performing APC control for individual colors.
The following is an outline of APC control operation, executed each time the machine is turned on and for each print job:
1) The DC controller sends the laser control signal (LC_CTL_X(0)=0, LC_CTL_X(1)=1) to the laser driver IC on the laser driver PCB. (X differs depending on
the color.)
2) The laser driver IC is set to APC mode, thus forcing the laser diode (LD) to go on.
3) The laser driver IC monitors the laser diode (LD) by means of a photo diode (PD), adjusting the output of the laser diode until its light is a specific level of
intensity.
4) The laser driver IC stores the laser output in memory for use in the next print job.
Scanner motor constant
speed of rotation detection
START
BD interval
measurement
Write start correction
value computation
Write start
position correction
END
BD1
BD2
BD3
BD4
Short interval
Specific interval
Specific interval
Specific interval
BD1
BD2
BD3
BD4
BD1
T1
BD2
BD3
BD4
VDO
T1
VDO
T1
VDO
T1
VDO
Содержание iR C2880 series
Страница 1: ...Aug 29 2006 Service Manual iR C3380 2880 Series ...
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Страница 23: ...Chapter 1 Introduction ...
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Страница 53: ...Chapter 2 Installation ...
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Страница 127: ...Chapter 3 Basic Operation ...
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Страница 137: ...Chapter 4 Main Controller ...
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Страница 161: ...Chapter 5 Original Exposure System ...
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Страница 188: ...Chapter 5 5 24 F 5 68 4 Remove the original sensor 2 hook 1 F 5 69 ...
Страница 189: ...Chapter 6 Laser Exposure ...
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Страница 207: ...Chapter 7 Image Formation ...
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Страница 257: ...Chapter 8 Pickup Feeding System ...
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Страница 303: ...Chapter 9 Fixing System ...
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Страница 321: ...Chapter 10 Externals and Controls ...
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Страница 336: ...Chapter 10 10 10 F 10 10 2 Remove the check mark from SNMP Status Enabled ...
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Страница 359: ...Chapter 11 MEAP ...
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Страница 401: ...Chapter 12 RDS ...
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Страница 411: ...Chapter 13 Maintenance and Inspection ...
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Страница 416: ...Chapter 13 13 2 F 13 1 8 9 1 2 3 3 5 6 7 10 11 12 13 14 4 ...
Страница 421: ...Chapter 14 Standards and Adjustments ...
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Страница 431: ...Chapter 15 Correcting Faulty Images ...
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Страница 459: ...Chapter 16 Self Diagnosis ...
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Страница 481: ...Chapter 17 Service Mode ...
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Страница 571: ...Chapter 18 Upgrading ...
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Страница 603: ...Chapter 19 Service Tools ...
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Страница 605: ...Contents Contents 19 1 Service Tools 19 1 19 1 1 Special Tools 19 1 19 1 2 Solvents and Oils 19 2 ...
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Страница 609: ...Aug 29 2006 ...
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