Xerox Phaser 6120 Service Manual

Print Engine Theory of Operation
Phaser® 6120 Color Laser Printer Service Manual
7-55
AIDC Sensor LED Intensity Control
The following adjustment is made to correct any changes in characteristics occurring due to
change with time and contamination of the AIDC Sensor (AIDC): the intensity of the LED is
adjusted for the surface of the Transfer Belt on which no toner sticks, so that the output value
of the AIDC Sensor (AIDC) becomes constant.
Reflectance Measurement Control
■ The reflectance of the Image Transfer Belt is measured using the ADIC Sensor (AIDC).
One measurement is taken for one complete turn of the Image Transfer Belt.
■ The measured value is corrected during the laser intensity adjustment control.
Control of the Maximum Amount of Toner Sticking
The developing bias setting value is adjusted to keep constant the amount of toner sticking to
the surface of the Photo Conductor.
Laser Intensity Adjustment Control
Characteristics of the Photo Conductor, developing, and charging change as affected by
changes with time and in environment. The intensity of the laser light is adjusted so that fine
lines and gradations of a predetermined level are reproduced at all times.
Density Correction Control
A gradation pattern is produced on the surface of the Image Transfer Belt. The AIDC Sensor
(AIDC) measures the density of the pattern and sends the measured result to the controller for
gradation adjustment.
Image Stabilization Timing
Mode Operation Timing
Mode 1
■ The environment in which the Power Switch is turned ON is different from the
environment the machine was in when the Power Switch was turned OFF last.
■ The environment in which the Energy Saver mode is canceled is different from the
environment the machine was in when it entered the Energy Saver mode last.
■ The Power Switch is turned OFF and ON or the Energy Saver mode is canceled after
a predetermined number of printed pages have been produced.
■ A new Imaging Unit or Toner Cartridge is detected.
Mode 2 The Power Switch is turned OFF and ON or the Energy Saver mode is canceled after a
predetermined number of printed pages have been produced.

Xerox Phaser 6120 Specifications

General

Color	Yes
Print technology	Laser
Time to first page (black, normal)	13 s
Time to first page (color, normal)	22 s
Print speed (black, normal quality, A4/US Letter)	20 ppm
Print speed (color, normal quality, A4/US Letter)	5 ppm
Internal memory	128 MB
Processor model	300 MHz, 32 bit RISC
Maximum print size	210 x 297 mm
Maximum ISO A-series paper size	A4
I/O ports	USB
Power requirements	200 – 240 VAC / 100 – 127 VAC 50/60 Hz
Networking features	Ethernet/Fast-Ethernet
Non-operating relative humidity (non-condensing)	10 - 85 %
Total input capacity	200 sheets
Maximum input capacity	500 sheets
Printer fonts	PostScript
Maximum duty cycle	35000 pages per month
Number of PostScript fonts	139
Power consumption (printing)	380 W
Storage temperature (T-T)	-20 - 40 °C
Operating temperature (T-T)	10 - 32 °C
Operating relative humidity (H-H)	10 - 80 %

Weight and Dimensions

Dimensions (WxDxH)	442 x 395 x 341 mm