Xerox Phaser 6128MFP Service Manual

2-58 Phaser 6128MFP Service Manual
Theory of Operation
Fax
Fax Overview
A Fax is a device that sends and receives image data using either an analog or a
digital telephone line.
The three basic units of a Fax are the Scanner (for reading the image), the Control
Circuit, and the Printer.
The scanner splits the image into a fine grid and reads the brightness (white/
black) of each cell. This operation is called scanning. The white/black information
is converted to a digital signal: bright cells become 1, dark cells become 0.
The digital signal from a scanned image is subjected to DA conversion
(modulation) by the control circuit to enable transmission over an analog
telephone line. After conversion, the data is sent as an analog signal. The sound
audible during transmission is image data that has become an analog signal, that
is, an audio signal.
The analog signal arriving over the telephone line is then subjected to AD
conversion (demodulation) by the control circuit of the receiving Fax machine, and
restored to a digital signal.
The black/white information obtained from the AD conversion is sent to the
printer, where black cells are reproduced on the paper at the positions where they
were on the original.
Fax Scans
For a G3 Fax (normal mode: G3 Normal), scanning is performed at the resolution of
8 divisions per millimeter (200 dpi) in the horizontal direction and 3.85 divisions
per millimeter in the vertical direction. This means that the 200 dpi in-line CCD
unit is shifted approximately four times per millimeter in the vertical direction. For
an A4 original, the data amounts to approximately two million pixels. In the high-
quality mode (G3 Fine), scanning resolution is 8 divisions per millimeter in the
horizontal direction and 7.7 divisions per millimeter in the vertical direction, where
the data amounts to approximately four million pixels. As resolution increases, the
amount of data also increases, lengthening the transmission time.
s6128-058
Fax System (Overview)
Image Scanner Control Circuit Control Circuit Printer
Scanning
Printing
DA
Conversion
AD
Conversion
Telephone
Line
Original
Digital Signal Analog Signal Digital Signal
Printing

Xerox Phaser 6128MFP Specifications

General

Print technology	Laser
Maximum resolution	600 x 600 DPI
Economical printing	Yes
Time to first page (black, normal)	14 s
Time to first page (color, normal)	17 s
Print speed (black, normal quality, A4/US Letter)	16 ppm
Print speed (color, normal quality, A4/US Letter)	12 ppm
Scanner type	Flatbed scanner
Image formats supported	JPG, TIF
Copier resize	- %
Time to first copy (black, normal)	18 s
Copy speed (black, normal quality, A4)	16 cpm
Copy speed (color, normal quality, A4)	12 cpm
Faxing	Mono faxing
Fax speed dialing (max numbers)	200
Total input capacity	250 sheets
Total output capacity	150 sheets
Display	LCD
Market positioning	Business
Internal memory	384 MB
Card reader integrated	No
Sound pressure level (copying)	52.2 dB
Sound pressure level (printing)	14.9 dB
Maximum print size	216 x 297 mm
Paper tray media types	Bond paper, Card stock, Envelopes, Glossy paper, Labels, Plain paper
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Legal (media size), Letter (media size), Oficio (media size), Statement (140 x 216mm)
ISO A-series sizes (A0...A9)	A4, A5
JIS B-series sizes (B0...B9)	B5
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 216 g/m²
Power supply type	AC
Dimensions (WxDxH)	425 x 507 x 585 mm
Power requirements	120 V, 50/60 Hz
Networking features	Fast Ethernet
All-in-one functions	Copy, Fax, Scan
Standard media sizes	76.2 x 127 mm - 215.6 x 355.6 mm
Color all-in-one functions	copy, print, scan
Compatible operating systems	Windows 2000+ Mac OS X v10.3 - 10.5 Red Hat Enterprise Linux 5 Desktop SUSE Linux Desktop 10+
Dimensions (W x D x H) (imperial)	16.7 x 20 x 23 \
Acoustic power emissions (active, print, copy or scan)	62.2/30.3 dB
Standard interfaces	USB 2.0
USB 2.0 ports quantity	1
Power consumption (standby)	18.4 W
Power consumption (average operating)	360 W
Sustainability certificates	ENERGY STAR
Certification	EEC, FCC
Maximum duty cycle	40000 pages per month
Recommended duty cycle	3000 pages per month
Storage temperature (T-T)	-20 - 40 °C
Operating temperature (T-T)	10 - 32 °C
Non-operating relative humidity (non-condensing)	10 - 85 %