Xerox Phaser 7400 Service Manual

Theory of Operation 2-15
Sensors
The printer contains sensors of various types that perform a variety of functions. One
group of sensors track the progress of the paper along the paper path, and detect if a
paper jam occurs. Other sensors detect the presence of the Toner Cartridges, stop
printer activity if a door is open (interlock), detect the presence and size of media in
the trays, and monitor the fusing temperature.
Sensor Types
The types of sensors used vary with function. In general, there are four types in use:
Photo Sensors
Two types of photo sensors are used, photo-reflective and photo-receptive.
Photo-reflective sensors use light reflected back from an object to detect its presence.
Photo-receptive sensors use an actuator or the object itself to block the light path to
detect an object or condition.
Photo-reflective sensors have the light emitter and light receiver aligned on a single
surface. Output of the photo-receptor is High (> +4.5 V) when light is being reflected
back and Low (< +.3 V) when it isn’t. Photo-receptive sensors consist of a LED in one
arm of a U-shaped holder, and a photo-transistor in the other arm. When the sensing
area is unobstructed, light falls on the photo-receptor sending the signal High. If the
light is interrupted, the photo-transistor goes Low. The figure below shows a typical
photo-receptive sensor with the Hooks (catches) used to secure the sensor to its
bracket.
Hooks
Hook
Sensor Bracket
s7400-310

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