Xerox Phaser 6120 Service Manual

Print Engine Theory of Operation
Phaser® 6120 Color Laser Printer Service Manual
7-48
Fuser Drive
Heating Roller Drive Control
Speed Change Control
■ Drive for the Heating Roller is provided by the Fusing Motor (M7).
■ To prevent fusing failure, the fusing speed is changed according to the media type in use.
Speed Stabilization
■ To prevent ghosting or smearing, the difference between the fusing speed and paper
transport speed during image transfer is corrected.
■ The fusing speed is changed in two steps relative to the system speed, either at high speed
(which is +2% of the system speed) or low speed (which is -2.5% of the system speed).
■ The Fusing Motor (M7) is controlled to achieve this speed change in two steps.
Fuser Sequence
1. The initial fusing speed is set to the low speed, thereby forming a loop in the paper
between the 2nd Transfer Roller and Fusing Rollers.
2. The Fusing Paper Loop Sensor (PC8) is activated (blocked) when the loop is formed.
3. While the Fusing Paper Loop Sensor (PC8) remains activated, the fusing speed is kept at
the high level.
4. When the Fusing Paper Loop Sensor (PC8) is deactivated, the fusing speed is immediately
switched to the low level.
Fusing Motor
Heating Roller
4139to2094e0

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