Chapter 6
6-4
6.2
Basic Sequence
6.2.1
Basic Sequence of Operation
0002-9844
The following shows the basic sequence of operation of the laser exposure system:
1) the Start key is pressed or the print request signal arrives from the main controller PCB.
2) the DC controller PCB executes a control mechanism so that the laser scanner
3) rotates at the target speed; at the same time, it forces the laser unit to go on for a check on faults.
4) the machine becomes ready for forming an image.
5) the DC controller PCB generates sub scanning sync signals (see Memo; PVREQY, PVREQM, PVREQ
C,PVREQK) for individual colors, and sends them to the main controller PCB.
6) the main controller PCB generates video signals using the sub scanning sync signals, and sends them to the DC
controller PCB.
7) in response, the DC controller PCB turns on the laser unit to suit the video signals.
Full Color, A4, Plain Paper, 1 Page
F-6-4
[1] press on the Start key (print request signal)
[2] ready for image formation
Memo:
The sub scanning direction sync signal (PVREQ) is used to match the leading edge of the toner image on the drum
and the leading edge of the print paper.
The timing at which the PVREQ signal is generated differs depending on the selected color mode:
Full Color Mode
In the case of full color mode, an image must be formed in 4 colors (Y, M, C, Bk). All images are first formed on the
intermediate transfer belt (ITB), and they must be controlled so that their leading edges will match without color
displacement.
When the machine becomes ready for image formation in full color mode, the ITB home position sensor generates
the ITBHP signal to serve as a reference so that the machine may generate the PVREQ signal for each color.
Mono Color Mode
In the case of mono color mode, there is no need for color matching. When the machine becomes ready for image
formation, therefore, it generates the PVREQ signal at specific timing regardless of the ITB home position signal
(ITBHP).
[1]
[2]
Scanner motor
ITB HP
PVREQ
(M,Y,C,K)
Video
Laser
STBY
STBY
INTR
LSTR
M
Y
C
K
Harf
Harf
Full
M
Y
C
K
Содержание iR C6800 Series
Страница 1: ...Apr 6 2004 Service Manual iR C6800 Series iR C6800C ...
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Страница 21: ...Chapter 1 Introduction ...
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Страница 55: ...Chapter 2 Installation ...
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Страница 110: ...Chapter 2 2 52 2 Hook the original holder 1 on the stepped screws you fitted in step 1 F 2 157 1 ...
Страница 115: ...Chapter 3 Basic Operation ...
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Страница 129: ...Chapter 4 Main Controller ...
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Страница 178: ...Chapter 4 4 46 ...
Страница 179: ...Chapter 5 Original Exposure System ...
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Страница 234: ...Chapter 5 5 52 ...
Страница 235: ...Chapter 6 Laser Exposure ...
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Страница 257: ...Chapter 7 Image Formation ...
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Страница 562: ...Chapter 7 7 296 ...
Страница 563: ...Chapter 8 Pickup Feeding System ...
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Страница 614: ...Chapter 8 8 46 F 8 49 10 9 12 11 5 5 4 4 3 5 1 2 1 2 3 1 2 3 4 1 2 3 4 5 ...
Страница 616: ...Chapter 8 8 48 F 8 51 2 1 3 3 3 2 1 1 2 1 2 3 5 6 7 8 ...
Страница 660: ...Chapter 8 8 92 ...
Страница 661: ...Chapter 9 Fixing System ...
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Страница 728: ...Chapter 9 9 64 ...
Страница 729: ...Chapter 10 Externals and Controls ...
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Страница 734: ...Contents ...
Страница 742: ...Chapter 10 10 8 F 10 2 FM12 FM11 FM1 FM2 FM4 FM3 FM6 FM7 FM9 FM8 FM5 FM13 FM14 FM10 ...
Страница 787: ...Chapter 11 Maintenance and Inspection ...
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Страница 815: ...Chapter 12 Standards and Adjustments ...
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Страница 868: ...Chapter 12 12 50 ...
Страница 869: ...Chapter 13 Correcting Faulty Images ...
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Страница 882: ...Chapter 13 13 10 13 3 Troubleshooting ...
Страница 891: ...Chapter 13 13 19 F 13 8 F 13 9 Field Remedy Replace the connector with the harness intact 3 4 1 5 2 ...
Страница 896: ...Chapter 13 13 24 F 13 11 F 13 12 Field Remedy Replace the connector with the harness intact 3 4 1 5 2 ...
Страница 898: ...Chapter 13 13 26 Image Sample F 13 13 ...
Страница 900: ...Chapter 13 13 28 Image Sample F 13 15 ...
Страница 929: ...Chapter 13 13 57 Image Sample F 13 45 ...
Страница 932: ...Chapter 13 13 60 Image Sample image of a specific color is too light F 13 47 ...
Страница 933: ...Chapter 13 13 61 image of a specific color is too dark F 13 48 ...
Страница 934: ...Chapter 13 13 62 image is too light overall F 13 49 ...
Страница 938: ...Chapter 13 13 66 F 13 51 1 Web retaining pad 2 Cam 3 Cleaning web 4 Outside heating roller 5 Fixing roller 1 2 2 3 4 5 ...
Страница 944: ...Chapter 13 13 72 F 13 53 F 13 54 Field Remedy Replace the connector with the harness intact 3 4 1 5 2 ...
Страница 966: ...Chapter 13 13 94 F 13 70 PS65 PS38 PS39 PS46 PS44 PS45 PS52 PS53 PS58 PS59 PS37 ...
Страница 968: ...Chapter 13 13 96 F 13 71 SW14 SW15 SW12 SW11 SW1 SW13 SW2 SW3 ...
Страница 974: ...Chapter 13 13 102 F 13 74 13 2 5 3 14 15 16 9 6 12 7 1 11 4 25 24 21 23 19 20 31 29 28 27 26 22 18 17 32 30 10 8 ...
Страница 980: ...Chapter 13 13 108 ...
Страница 981: ...Chapter 14 Self Diagnosis ...
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Страница 1051: ...Chapter 15 Service Mode ...
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Страница 1075: ...Chapter 15 15 11 15 2 1 4 JAM 15 2 1 4 1 Overview 0001 0066 Use it to check jam data F 15 10 1 3 4 5 2 6 7 ...
Страница 1302: ...Chapter 15 15 238 ...
Страница 1303: ...Chapter 16 Upgrading ...
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Страница 1395: ...Chapter 17 Service Tools ...
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Страница 1397: ...Contents Contents 17 1 Special Tools 17 1 17 2 Solvents and Oils 17 3 ...
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Страница 1402: ...Chapter 17 17 4 ...
Страница 1403: ...Apr 6 2004 ...
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