Xerox Phaser 7400 Service Manual

Theory of Operation 2-5
Fuser Life Expectancy
The life expectancy is 100,000 Letter/A4 size pages. Several factors reduce Fuser life:
■ Paper use larger than letter size
■ Printing on heavy media
■ Printing short-edge feed
■ Printing on transparencies or specialty media
■ Repetitive image, long print runs
Transfer Unit
The Transfer Unit transports the media under all four Imaging Unit drums using a
belt. Transfer Rollers within the Transfer Unit receive biasing voltages from the
HVPS to attract the toner from the drums to the media.
Temperature Sensors These are Thermistors having a known value of resistance that
varies with temperature. The sensors monitor the surface
temperature of the Heat and Pressure Rollers.
Thermostats The Thermostats provide a second-level of protection. If the
Heat or Pressure Roller temperature exceeds the target
temperature, AC power is cut-off to the Heater Rods. Once the
Thermostats have opened, the Fuser must be replaced.
Fuser Exit Sensor This sensor detects the arrival of the paper at the exit area of the
Fuser. When paper is present, the signal /EXIT is Low.
Fuser Components (Continued)
Component Function
Transfer Rollers
Transfer Unit Belt
Imaging Unit Drums
s7400-030
Transfer Unit Belt Motor
KY MC

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