Chapter 6
6-6
6.3.2 Controlling the Intensity of Laser Light
6.3.2.1 APC Control
0012-7586
imagePRESS C1 P / imagePRESS C1 / imagePRESS C1+ (Printer) / imagePRESS C1+
In the APC control, the laser is controlled to keep the constant light intensity by adjusting the laser diode output on the laser driver.
This control is executed with the DC controller PCB.
The DC controller PCB output the laser signal to the laser driver IC in the laser driver PCB.
Herewith, the APC mode is set to the laser driver IC, and the laser diode (LD) is compulsorily emitted.
At the same time, the laser driver IC monitors the laser diode (LD) with the photo diode (PD), and it adjusts the laser diode output until the light intensity becomes
constant.
F-6-7
[1] Laser Driver IC
DC-CON: DC Controller PCB
6.3.2.2 PWM Control
0012-7589
imagePRESS C1 P / imagePRESS C1 / imagePRESS C1+ (Printer) / imagePRESS C1+
The PWM control determines the laser lighting time depending on the image data transmitted from the main controller PCB.
The laser lighting time (see Note) is selected at the DC controller PCB, and it determines the one pattern from 30-level of lighting patterns for each pixel.
MEMO:
The relationship between the laser lighting time and the image density is shown below.
With this machine, the laser is exposed to the dark area (image area), not to the bright area (non-image area).
When the image density gets higher, the laser lighting time becomes longer, whereas when it gets lower, the time becomes shorter.
F-6-8
6.3.3 Controlling the Laser Scanner Motor
6.3.3.1 Laser Scanner Motor Control
0012-7592
imagePRESS C1 P / imagePRESS C1 / imagePRESS C1+ (Printer) / imagePRESS C1+
The laser scanner motor control is used for rotating the scanner motor with the specified speed.
This control is executed at the motor speed control block in the DC controller PCB and the standard signal generation block.
The motor speed control block detects the speed detection signal (FG, BD), and controls the acceleration signal (ACC) and deacceleration signal (DEC) to be the
specified speed by comparing the standard signal generated in the standard signal generation block.
With this machine, in order to shorten the scanner motor control time, the speed detection point is switched depending on the printer condition. FC signal is the
detection signal for roughly adjusting the motor speed, and it is used when turning on the power or at the last rotation.
BD signal is the detection signal for finely adjusting the motor speed, and it is used at printing.
Laser Driver
[1]
LD
LD
PD
DC-CON
J3500 J1170
100%
Содержание imagePRESS C1
Страница 1: ...Oct 22 2008 Service Manual imagePRESS C1 Series ...
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Страница 38: ...Contents ...
Страница 39: ...Chapter 1 Introduction ...
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Страница 72: ...Chapter 1 1 30 F 1 18 ...
Страница 85: ...Chapter 1 1 43 T 1 26 ...
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Страница 89: ...Chapter 2 Installation ...
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Страница 235: ...Chapter 3 Basic Operation ...
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Страница 245: ...Chapter 4 Main Controller ...
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Страница 276: ...Chapter 5 Original Exposure System ...
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Страница 332: ...Chapter 6 Laser Exposure ...
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Страница 342: ...Chapter 6 6 8 F 6 10 1 Laser Light 2 Laser Shutter 3 Laser Shutter Lever 1 1 2 2 1 2 3 3 3 3 ...
Страница 344: ...Chapter 7 Image Formation ...
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Страница 431: ...Chapter 7 7 82 ...
Страница 462: ...Chapter 8 Pickup Feeding System ...
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Страница 503: ...Chapter 8 8 38 4 F 8 49 5 F 8 50 B Duplexing re pickup stop position 6 F 8 51 2 1 3 2 1 B 1 3 2 ...
Страница 504: ...Chapter 8 8 39 7 F 8 52 8 F 8 53 9 F 8 54 1 3 2 1 2 4 3 1 2 4 3 ...
Страница 505: ...Chapter 8 8 40 10 F 8 55 11 F 8 56 12 F 8 57 1 4 2 3 5 4 1 3 2 1 4 2 5 3 ...
Страница 506: ...Chapter 8 8 41 13 F 8 58 14 F 8 59 15 F 8 60 5 1 2 3 4 1 2 3 5 4 1 2 3 4 5 ...
Страница 507: ...Chapter 8 8 42 16 F 8 61 1 2 3 4 5 ...
Страница 509: ...Chapter 8 8 44 3 F 8 64 A Duplexing reversal position 4 F 8 65 2 1 A 2 1 ...
Страница 510: ...Chapter 8 8 45 5 F 8 66 6 F 8 67 2 1 2 1 ...
Страница 511: ...Chapter 8 8 46 7 F 8 68 8 F 8 69 3 2 1 3 2 1 ...
Страница 512: ...Chapter 8 8 47 9 F 8 70 10 F 8 71 3 2 1 2 3 1 ...
Страница 513: ...Chapter 8 8 48 11 F 8 72 B Duplexing re pickup stop position 12 F 8 73 3 2 B 1 3 1 2 ...
Страница 514: ...Chapter 8 8 49 13 F 8 74 14 F 8 75 1 2 3 1 2 3 ...
Страница 516: ...Chapter 8 8 51 F 8 77 SL3 M10 PS17 ...
Страница 533: ...Chapter 8 8 68 F 8 154 1 2 4 3 2 3 4 ...
Страница 534: ...Chapter 9 Fixing System ...
Страница 599: ...Chapter 10 Externals and Controls ...
Страница 642: ...Chapter 11 MEAP ...
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Страница 695: ...Chapter 12 Maintenance and Inspection ...
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Страница 700: ...Chapter 12 12 2 F 12 1 28 9 10 14 13 29 29 11 12 27 6 3 1 2 5 4 7 8 15 16 ...
Страница 701: ...Chapter 12 12 3 F 12 2 17 20 24 23 25 26 19 18 24 21 22 ...
Страница 704: ...Chapter 12 12 6 F 12 3 1 2 3 4 9 6 5 7 8 11 12 13 14 15 10 ...
Страница 715: ...Chapter 12 12 17 F 12 18 1 1 2 2 ...
Страница 716: ...Chapter 13 Standards and Adjustments ...
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Страница 732: ...Chapter 14 Correcting Faulty Images ...
Страница 829: ...Chapter 14 14 94 F 14 93 J406 J206 J209 J203 J92 J3802 J57 J84 J91 J52 J79 J203 J204 J208 J201 J551 J1168 J115 ...
Страница 834: ...Chapter 14 14 99 F 14 98 J420 J432 J423 J422 J3417 J3415 J421 J427 J426 J454 J430 J425 J3410 J431 J425 J429 J433 J3416 ...
Страница 848: ...Chapter 14 14 113 F 14 112 J406 J206 J209 J203 J92 J3802 J57 J84 J91 J52 J79 J203 J204 J208 J201 J551 J1168 J115 ...
Страница 862: ...Chapter 15 Self Diagnosis ...
Страница 894: ...Chapter 16 Service Mode ...
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Страница 1222: ...Chapter 17 Upgrading ...
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Страница 1256: ...Chapter 17 17 31 F 17 65 2 Turn off the main power switch and remove the USB device ...
Страница 1257: ...Chapter 18 Service Tools ...
Страница 1258: ...Contents Contents 18 1 Service Tools 18 1 18 1 1 Special Tools 18 1 18 1 2 Solvents and Oils 18 2 ...
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Страница 1264: ...Oct 22 2008 ...
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