Xerox Phaser 3600 Service Manual

2-2 Phaser 3600 Printer Service Manual
Theory of Operation
Phaser 3600 Operational Overview
Summary of the Printing Process
The Phaser 3600 Laser Printer is a desktop monochrome laser printer,
applying the principals of an electrophotographic system to place a
monochrome image onto the print media. The system contains a drum and
developing unit which places the toner image onto print media producing
monochrome prints through the transfer unit.
The printing process is composed of the following:
Charging: T
h
e charge roller is negatively charged at approximately -1400
VDC by the high voltage power supply (HVPS). The charge roller is kept in
contact with the drum surface to provide a uniform negative charge of
approximately -800 VDC on the drum surface as it rotates at a constant
speed.
Exposure: T
h
e Laser Scan Unit (LSU) emits laser beams in response to
image data from the Main board. The laser beams are directed onto the drum
surface through a system of mirrors and lenses. A rotating polygonal mirror
causes the laser beams to scan the drum surface from end to end (axially) as
it rotates. The beams are turned on to print a pixel and off when no printing is
required. The negative charge on the drum surface is reduced to
approximately -250 VDC at each point where the energized laser beam
strikes, to form an invisible electrostatic latent image on the drum surface.
Development: N
ega
tively charged toner particles from the toner hopper are
applied to the supply roller and are then applied to the developer roller in a
even layer controlled by the metering blade. The developer roller turns against
the drum and the toner particles are attracted to the relatively positive latent
image. The toner forms a visible image on the drum surface.
Pre-Clean: T
h
e pre-transfer Lamp exposes the developed surface of the
drum lowering the surface potential and thereby providing enhanced transfer
efficiency.
Transfer: Th
e finished toner image on the drum is transferred onto the print
media using the voltage supplied by the Transfer Roller. The conductive
Transfer Roller receives a high positive voltage (approximately +1000 VDC)
from the HVPS that puts it at a higher potential than the drum. Since the
Transfer Roller is located behind the print media, the toner image is attracted
to the high potential and deposits on the surface of the print media.
Fixing: T
he finished toner image is impermanent and easily smeared. To fix
the
image, the print media goes through the Fuser where it passes between a
pressure roller and the Heat Roller. The toner is fused onto the print media by
the combination of heat and pressure.
The Heat Roller is heated by a heat element. The roller surface temperature is
det
ec
ted by a Thermistor. The information is fed back to the heater control to
maintain a surface temperature of 185º C during printing and 145º C during
standby. If the thermostats detect a Fuser overheat condition, it disconnects
AC power to the Fuser.
Cleaning: A
fte
r the image is transferred to the print media, a cleaning blade
inside the cartridge removes any remaining toner particles from the drum.

Xerox Phaser 3600 Specifications

General

Color	No
Duplex printing	Yes
Print technology	Laser
Maximum resolution	600 x 600 DPI
Warm-up time (from sleep mode)	31 s
Print speed (black, normal quality, A4/US Letter)	38 ppm
Internal memory	32 MB
Maximum internal memory	512 MB
Total input capacity	600 sheets
Total output capacity	250 sheets
Maximum input capacity	1100 sheets
Paper tray 2 input capacity	500 sheets
Functions	Print
I/O ports	Parallel (IEEE 1284), USB 2.0
Device manager	DHCP, Xerox CentreWare Internet Services Embedded Web Server, Xerox CentreWare Printer Management for Microsoft, Novell, and UNIX
Package length	563.87 mm
Depth (imperial)	18.8 \
Width (imperial)	15.7 \
Height (imperial)	15.1 \
Power requirements	240 V, 50/60 Hz
Standard input trays	2
Print memory (standard)	64 MB
Power consumption (active)	700 W
Compatible operating systems	HP-UX 10.2, Linux, Mac OS X ver.10.2 Red Hat 9, SCO, SUSE 9, Solaris 2.5.1/2.6+, Windows 2000/Vista
Acoustic power emissions (standby)	35 dB
Standard output capacity for envelopes	8000 sheets
Acoustic power emissions (active, print, copy or scan)	56 dB
PCL fonts	68
Certification	CE, UL 60950-1/CSA 60950-1-03, FCC Part 15 Class A, 73/23/EEC, RoHS 2002/95/EC
Maximum duty cycle	200000 pages per month
Recommended duty cycle	8000 pages per month
Number of PostScript fonts	136
Power consumption (standby)	13 W
Power consumption (PowerSave)	130 W
Export Control Classification Number (ECCN)	EAR99

Weight and Dimensions

Depth	478 mm
Width	399 mm
Height	383 mm
Package width	515.61 mm
Package height	584.19 mm
Package weight	21201.2 g
Dimensions (WxDxH)	399 x 462 x 383 mm