![background image](http://html2.mh-extra.com/html/xerox/phaser-6280/phaser-6280_service-manual_4166966116.webp)
2-54
Phaser 6280 Color Laser Printer Service Manual
Theory of Operation
4.
The drum charging voltage, developing DC voltage, and the Laser Unit
beam intensity are adjusted for each color according to the detected
patch density.
Toner Density Control
Toner density must be kept constant to attain stable printing. The control
system for this purpose is called toner density control.
1.
PCDC (Pixel Count Dispense Control)
The amount of toner to be consumed in the developing process is
calculated by counting the video signals entered to the Laser Unit. The
amount of the toner to be consumed is calculated by the toner dispensing
time. The toner motor is driven for the calculated toner dispensing time
when supplying the toner to the Developer.
2.
ADC (Auto Density Control)
The patches of respective colors (Yellow, Magenta, Cyan, and Black) for
the toner density control are generated under a specified potential
condition, and transferred on the Belt. The ADC Sensor measures this
density, and the measured value is compared with reference value. If the
toner density is low, the toner dispense quantity is increased at the next
printing, or if the toner density is higher, the toner dispense quantity is
reduced at the next printing. The toner dispense quantity is calculated by
the toner dispense time. This calculation is made for each color.
High Area Coverage Mode
A continuous printing of any image of area coverage exceeding the toner
dispense capability causes the toner density in the Developer to be lowered.
The High Area Coverage Mode postpones the next page feed and dispenses
extra toner during this time, if the toner dispense time reaches the specified
value during a continuous printing.
Admix Mode
The Admix Mode dispenses toner immediately to prevent the reduction of
toner density, whenever the value of the toner density control patch measured
by the ADC Sensor falls far below the standard value, by dispensing extra
toner. If the toner density level cannot be recovered after this operation, it is
determined that toner has run out.
Paper Feeding
Length of One Turn of Belt
Toner Patch
Potential Control Patch Density
Содержание Phaser 6280
Страница 1: ...Phaser 6280 Color Laser Printer Phaser 6280 Service Manual...
Страница 2: ......
Страница 15: ...Phaser 6280 Color Laser Printer Service Manual xiii...
Страница 16: ...xiv Phaser 6280 Color Laser Printer Service Manual...
Страница 26: ...xxiv Phaser 6280 Color Laser Printer Service Manual Table of Contents...
Страница 57: ...Phaser 6280 Color Laser Printer Service Manual 1 31 General Information Configuration Page configuration ai...
Страница 62: ...1 36 Phaser 6280 Color Laser Printer Service Manual General Information...
Страница 288: ...3 152 Phaser 6280 Color Laser Printer Service Manual Error Messages and Codes...
Страница 390: ...5 16 Phaser 6280 Color Laser Printer Service Manual Print Quality Troubleshooting Page 5 s6280 285...
Страница 432: ...5 58 Phaser 6280 Color Laser Printer Service Manual Print Quality Troubleshooting...
Страница 433: ...6 Chapter Adjustments and Calibrations In this chapter Adjustments Calibrations Parameter Setting...
Страница 441: ...7 Chapter Cleaning and Maintenance In this chapter Service Maintenance Procedure Cleaning Maintenance...
Страница 558: ...8 112 Phaser 6280 Color Laser Printer Service Manual Service Parts Disassembly...
Страница 670: ...I 10 Phaser 6280 Color Laser Printer Service Manual...
Страница 671: ......