Xerox Phaser 7400 Service Manual

2-14 Phaser 7400 Color Printer Service Manual
Image Transfer Control
The printer monitors environmental conditions with the temperature and humidity
sensors. The printer computes the optimal transfer voltage under the current
environmental conditions (temperature and relative humidity), and applies the optimal
transfer voltage to the Imaging Units and Transfer Unit Rollers.
Fuser Temperature Control
During Fuser temperature control the printer’s target temperature is set based on the
media weight reported by the Media Thickness Sensor. The target temperature is also
changed according to the printer’s internal temperature and humidity detected with
the Temperature and Humidity Sensor, print count, print mode, media type, and input
power supply voltage. Different target temperatures are set for standby, printing, and
process control.The Heat Roller surface temperature is controlled to match the target
temperature by turning the heater rods On and Off.
Fuser temperature is regulated according to the sum of the temperatures detected at
the Heat Roller and Pressure Roller surfaces. There is also a thermostat for safety
purposes. When the Heat Roller temperature rises above a certain temperature, the
thermostat opens and shuts down the power supplied to the heater rods.
Consumable Control
The new/in-use condition of maintenance units is determined by the condition of a
fuse. If the fuse in either the Fuser, Imaging Unit, or Transfer Unit is intact, the unit is
recognized as a new. This fuse is checked when the printer is turned On, or a cover
has been opened. When a new unit is detected, the printer resets the unit’s life counter
and blows the fuse indicating the unit is in-use. The count will not indicate it has been
reset until two pages have been printed.
Consumable Life Counter Behavior
Internal counters track consumable life usage and store the values on the Engine
Control Board EEPROM. The Image Processor Board stores the pixel count
information in NVRAM and monitors these counters in order to display the
consumable near end-of-life and at end-of-life messages.
The toner states displayed are OK, Low, and Empty. When an empty state is reached,
the printer terminates printing at the end of the current page and displays the
appropriate message on the Control Panel. No further jobs are accepted. All printer
CRCs wait for the current print job to finish before declaring a Low or Empty state.

Xerox Phaser 7400 Specifications

General

Color	Yes
Print technology	Laser
Maximum resolution	600 x 1200 DPI
Time to first page (black, normal)	12 s
Print speed (black, normal quality, A4/US Letter)	40 ppm
Print speed (color, normal quality, A4/US Letter)	36 ppm
Storage media	HDD
Internal memory	512 MB
Processor model	PowerPC
Maximum internal memory	1 MB
Internal storage capacity	20 GB
Total input capacity	800 sheets
Maximum input capacity	3000 sheets
Paper tray 2 input capacity	350 sheets
Auto document feeder (ADF) input capacity	1650 sheets
Maximum print size	297 x 420 mm
Paper tray media types	Envelopes, Labels, Transparencies
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Letter (media size), Statement (140 x 216mm), Legal (media size)
Maximum ISO A-series paper size	A3
Power requirements	100-240V, 50/60Hz
Networking features	Fast Ethernet
Supported media weight(s)	270 g/m²
Maximum operating temperature range (T-T)	10 - 32 °C
Certification	FCC p.15 A, CE
Storage temperature (T-T)	-20 - 60 °C
Operating temperature (T-T)	-4 - 140 °F
Storage relative humidity (H-H)	10 - 95 %
Operating relative humidity (H-H)	20 - 80 %
Maximum duty cycle	150000 pages per month

Weight and Dimensions

Dimensions (WxDxH)	1438 x 623 x 975 mm