Xerox Phaser 4620 User Manual

5/2011
8-5
Phaser 4600/4620 Printer Service Manual
Sensors
Principles of Operation
Revision - Xerox Internal Use Only
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 Drum Cartridge, stop printer activity if a door is open
(interlock), and monitor the fusing temperature.
Sensor Types
The types of sensors used vary with function. In general, there are three 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 is not. 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 vacant, nothing is
between the arms of the sensor, light falls on the photo-receptor sending the signal High. If the
light is interrupted, the photo-transistor goes Low. Figure 1 shows a typical photo-receptive
sensor with the hooks (catches) used to secure the sensor to its bracket.
Figure 1 Photo Sensor
Microswitches
Microswitches are used primarily as cover interlocks in the printer. They are in a normally open
state, and close when actuated. A bank of microswitches is used to detect paper size in the
universal trays. Microswitches also employ hooks or catches for retention in the bracket or
frame. Figure 2 illustrates a typical microswitch.
Figure 2 Door interlock switch
Thermistors have a known value of resistance whose value varies with temperature. Used pri-
marily in the Fuser for temperature sensing.

Xerox Phaser 4620 Specifications

General

Operating temperature (T-T)	50 - 90 °F
Operating relative humidity (H-H)	20 - 80 %
Color	No
I/O ports	10/100/1000 BaseT Ethernet, USB 2.0
Depth (min)	541 mm
Height (min)	420 mm
Minimum width	476 mm
Minimum weight	34.6 kg
Package length	698.49 mm
Print technology	Laser printing
Mac compatibility	Yes
Security features	Audit log, HTTPS, Image overwrite security, IP filtering, IPSec, Network authentication, SNMPv3, 802.1x
Storage drive type	Optional
Print memory (standard)	256 MB
Power consumption (active)	900 W
Minimum storage drive space	160 GB
Power consumption (standby)	93 W
Power consumption (PowerSave)	10 W
Storage media	HDD
Maximum internal memory	768 MB
Sound power level (standby)	39 dB
PCL fonts	93
Certification	Class 1 Laser Product, CE Marked, EMC Directive 89/336/EEC, EN 55022 Class B, EN 55024, FCC Part 15, Class B, Low Voltage Directive 73/23/EEC, RoHS Directive 2002/95/EC
Country of origin	China
Maximum duty cycle	275000 pages per month
Number of PostScript fonts	136
Number of print cartridges	1
Total input capacity	550 sheets
Total output capacity	500 sheets
Maximum input capacity	2000 sheets
Multi-Purpose tray input capacity	100 sheets
Maximum resolution	1200 x 1200 DPI
Time to first page (black, normal)	7.8 s
Print speed (black, normal quality, A4/US Letter)	65 ppm
Display	LCD
Package weight	40200 g
Maximum print size	216 x 356 mm
Paper tray media types	Bond paper, Card stock, Labels, Pre-Printed, Recycled paper, Transparencies
ISO A-series sizes (A0...A9)	A4
Standard interfaces	USB 2.0
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Export Control Classification Number (ECCN)	EAR99

Weight and Dimensions

Width	627.37 mm
Height	685.79 mm
Dimensions (WxDxH)	476 x 420 x 541 mm