
Chapter 8
8-15
1. Potential Control during High Humidity Mode
F-8-23
WMUPR
WMUP
STBY
195˚C
200˚C
Potential sensor
Laser
Grid bias
Vg
Pw
VD
VL
Potential determined
Vg
Pw
Vdc
Extra low humidity
Low humidity
Normal humidity
High humidity
-5%
+5%
+20V
+30V
Density
Darker
Lighter
In a low humidity environment,
the resistance of paper
decreases and, on the other
hand, the transfer efficiency
increases; as such, the laser
power is reduced to prevent
excess deposit of toner.
In a high humidity environment,
the moisture of paper decreases
the transfer efficiency; as such,
the laser power is increased to
increase the density.
Laser power
correction
value
Vdc
correction
value
VD
correction
value
Extra high humidity
Potential control
sequence started
The laser power/Vdc is corrected
to suit the environment.
Содержание ImageRunner iR8500 Series
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Страница 99: ...Chapter 2 Installation ...
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Страница 181: ...Chapter 3 Basic Operation ...
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Страница 258: ...Chapter 5 5 6 T 5 6 1 Fuse PCB 4 Inverter PCB 2 Reader controller PCB 5 CCD AP PCB 3 Differential PCB ...
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Страница 307: ...Chapter 6 Image Processing System ...
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Страница 319: ...Chapter 7 Laser Exposure ...
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