Xerox Phaser 3250 Service Manual

Phaser 3250 Laser Printer Service Manual 2-25
Theory of Operation
Driver
The Main Motor drives the Feed Roller, Developing Roller, and Exit Roller.
The BLDC Motor controls acceleration and steadiness of the Rollers. The
BLDC Motor is operated by the BLDC Clock and enable signal.
Transfer
The charging voltage, developing voltage, and transfer voltage are controlled
by Pulse Width Modulation (PWM). Each output voltage is changeable due to
the PWM duty cycle. The transfer voltage is used when the paper passes the
Transfer Roller is decided by environmental recognition. The resistance value
of the Transfer Roller changes due to the surrounding environment or the
printer, or the voltage value. This change in resistance in turn changes the
value of the voltage due to loading. This voltage is fed back into the printer
through the A/D Converter. Based on the value fed back, the PWM cycle is
changed to maintain the required transfer voltage.
Fusing
The temperature change of the Heat Roller’s surface is detected according to
the value of the Thermistor. The Thermistor resistance is measured using the
A/D Converter and thus the CPU can determine the temperature of the Heat
Roller. AC power is controlled by comparing the target temperature to the
value from the Thermistor. If the value from the Thermistor is out of the
controlled range while controlling the fusing process, an error is reported.
Lamp Method
Error Description LED Display
Open Heat Error When the engine operates at the warm-up
state, the temperature of the fixing unit is
not higher than a specified temperature.
When the error occurs, the engine stops all
functions and keeps it at error state.
■ Lower than 90° C for more than 10
seconds while warming up.
■ When the engine operates warm-up
process, if the temperature of the fixing
unit is not higher than a specified
temperature.
All LEDs blinking.

Xerox Phaser 3250 Specifications

General

Color	No
Print technology	Laser
Maximum resolution	600 x 600 DPI
Warm-up time (from sleep mode)	15 s
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	28 ppm
Internal memory	32 MB
Maximum internal memory	160 MB
Sound power level (standby)	29 dB
Sound pressure level (printing)	54 dB
Total input capacity	251 sheets
Maximum input capacity	501 sheets
Paper tray media types	Bond paper, Envelopes, Labels, Plain paper, Recycled paper, Transparencies
Functions	Print
I/O ports	USB 2.0
Device manager	Printer Setting Utility for Windows
Package length	561.33 mm
Depth (imperial)	14.5 \
Width (imperial)	14.3 \
Height (imperial)	9.4 \
Weight (imperial)	26.19 lbs
Power requirements	240 V, 50/60 Hz
Storage drive type	N/A
Hardware scan resolution	1200 x 1200 DPI
Storage temperature (T-T)	32 - 104 °F
Power consumption (active)	400 W
Compatible operating systems	Fedora Core 1, Red Hat 9, SUSE 9 Windows 2000/Vista
Non-operating relative humidity (non-condensing)	20 - 80 %
Country of origin	China
Maximum duty cycle	30000 pages per month
Recommended duty cycle	4000 pages per month
Sustainability certificates	ENERGY STAR
Power consumption (standby)	70 W
Power consumption (PowerSave)	11 W
Operating temperature (T-T)	10 - 32 °C
Operating relative humidity (H-H)	10 - 80 %
Certification	CE, UL 60950-1/CSA 60950-1-03, EMC 2004/108/EC, 2006/95/EC
Package width	472.43 mm
Package height	342.89 mm
Package weight	11884.3 g

Weight and Dimensions

Depth	369 mm
Width	364 mm
Height	239.2 mm
Dimensions (WxDxH)	364 x 369 x 239.2 mm