Xerox Phaser 6120 Service Manual

Print Engine Theory of Operation
Phaser® 6120 Color Laser Printer Service Manual
7-13
Laser Operation
■ The surface of the Photo Conductor is irradiated with a laser light and an electrostatic
latent image is thereby formed.
■ The Polygon Mirror has four faces. The machine uses a two-beam array Laser Diode (LD)
to inhibit the speed of the Polygon Mirror.
■ The two-beam array LD consists of two LD elements arranged vertically. Two lines are
scanned with two laser beams emitted from these two LD elements through a single face
of the Polygon Mirror.
Laser Exposure Process
1. The laser light emitted from the Semiconductor Laser strikes the Polygon Mirror.
2. The Polygon Mirror with four faces is rotated at high speed by the Polygon Motor.
3. The SOS Sensor ensures that the laser light emission start timing remains constant for
each line of the main scan.
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Photo
Conductor
Polygon Mirror
Laser Diode
Beam A
Two lines are
scanned in a single
scan motion.
Photo Conductor Surface
Direction of Rotation of Photo Conductor
Direction of Rotation
of Photo Conductor
Beam B
Beam A
Beam B
Return Mirror
G2 Lens
G1 Lens
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Photo Conductor
Semiconductor Laser
SOS Board
Polygon Motor

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