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Chapter 7
7-7
7.4.5 Determining the Optimum Laser Output
0010-8043
The machine determines the optimum laser output so that the drum surface potential (light area potential
VL) is identical to the target potential.
F-7-9
7.4.6 Laser Output Corrective Control
0010-8044
If the optimum laser output cannot be determined after measuring the drum surface potential, the machine
starts its compensatory control sequence to determine the optimum laser output.
F-7-10
WMUPR
WMUP
STBY
195
198
Potential sensor
Developing bias(DC)
Laser
60%
80%
60% or
80%
100%
100%
Measurement(VL2) Measurement(VL1orVL3) Measurement (target VL)
Pw
VL1
VL2
VL3
Laser output
The machine takes measurements multiple times
to determine the relationship between the drum
surface potential (VL) and the laser output.
If this measurement brings about
the target VL, ends the control;
otherwise, starts compensatory control.
After measuring VL2, measures VL3 if VL2
is grater than the target VL; if smaller,
measures VL1.
Turn on the lamp at 80% of the reference
output determined at time of shipment.
Determines the laser output (P)
needed to attain the target VL.
WMUPR
WMUP
STBY
193
198
Potential sensor
Developing bias(DC)
Laser
80%
60%
100%
Pw
Pw1
Pw2 Pw3
Pw8
VL1
VL1
VL2
VL3
VL8
VL-NG
VL-NG
VL2
VL3
Continues to take measurements while varying
the laser output so that it will approach
Target VL
Compensatory control sequence started
If the measurement is identical to the target VL, ends
control; executes measurement a maximum of 8 times,
possibly using an approximate value of the target VL.
Determines a laser output needed
to attain the target VL.
or
Содержание IMAGERUNNER 7086
Страница 20: ...Chapter 1 Introduction ...
Страница 46: ...Chapter 2 Installation ...
Страница 88: ...Chapter 3 Basic Operation ...
Страница 94: ...Chapter 4 Main Controller ...
Страница 116: ...Chapter 5 Original Exposure System ...
Страница 165: ...Laser Exposure Chapter 6 ...
Страница 175: ...Chapter 7 Image Formation ...
Страница 180: ...Chapter 7 7 3 7 3 Basic Sequence 7 3 1 Basic Sequence 0010 8038 F 7 3 ON ON WMUPR WMUP STBY OFF 100msec ...
Страница 231: ...Chapter 8 Pickup Feeding System ...
Страница 287: ...Chapter 9 Fixing System ...
Страница 312: ...Chapter 10 External and Controls ...
Страница 346: ...Chapter 11 MEAP ...
Страница 350: ...Chapter 12 RDS ...
Страница 360: ...Chapter 13 Maintenance Inspection ...
Страница 375: ...Chapter 14 Standards Adjustments ...
Страница 407: ...Chapter 15 Correcting Faulty Images ...
Страница 433: ...Chapter 16 Self Diagnosis ...
Страница 460: ...Chapter 17 Service Mode ...
Страница 559: ...Chapter 18 Upgrading ...
Страница 583: ...Chapter 19 Service Tools ...
Страница 584: ...Contents Contents 19 1 Service Tools 19 1 19 1 1 Special Tools Table 19 1 19 1 2 Solvents Oils 19 2 ...
Страница 588: ...APPENDIX ...
Страница 615: ......