Xerox Phaser 6120 Service Manual

Print Engine Theory of Operation
Phaser® 6120 Color Laser Printer Service Manual
7-50
Heater Lamp (H1) is turned OFF forcibly and the initiation of any new print cycle is
prohibited (abnormally high temperature detection control).
■ Hard Protection (Hard Stop)
Circuitry within the PWB-A Controls a relay that shuts down the power supply to the
Heater Lamp (H1) when an abnormal temperature is detected.
■ Thermostat Protection
If neither the soft protection nor hard protection can detect an abnormally high
temperature due to a defective Thermistor (TH1) or other reason, the Thermostat (TS1)
operates at the specified temperature. This shuts down the power supply to the Heater
Lamp (H1), thus forcibly turning it OFF.
PPM (Pages Per Minute) Control
■ PPM control is provided to prevent the temperature on edges of the Heating Roller from
increasing during a multi-print cycle using plain paper of a small size.
■ The distance between sheets of paper is widened according to the number of printed pages
set to be produced and the paper length. This evens out the temperature of the Heating
Roller and thus stabilizes fusing performance of the printed toner image.
■ To perform the PPM control, the number of printed pages per minute is established for
each paper size.
Triac Circuit
Power Switch
Watchdog Circuit
A/D
FUSER WDT
RESET
Heater Remote
ON/OFF
Heating Roller
Fusing PressureRoller
Thermostat
Laser Safety Switch
Heater Lamp
Thermistor
GND
5V
Mechanical Control Board
CPU
Hard Protection
Circuit
4139to2097e0

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