Xerox PHASER 3125 User Manual

General Procedures and Information
6-8 09/06 PHASER 3124 / PHASER 3125
LSU (Laser Scanning Unit)
The LSU unit is controlled by a video controller. It scans video data received from the video con-
troller with a laser beam by using the rotation principle of the polygon mirror to create the latent
image on the OPC drum. This is a core part of a laser beam printer.
The OPC drum rotates at the same speed as the paper being fed. The Phto Diode creates a
HSYNC signal and sends it to the engine when the laser beam of the LSU reaches the end of each
horizontal scan line. The engine detects the HSYNC signal and arranges the vertical line of the
image on to paper. After detecting the HSYNC signal, the image data is sent to the LSU to set the
margin on the paper. Each side of the polygon mirror represents one line of scanned data.
Figure 2 LSU

Xerox PHASER 3125 Specifications

General

Color	No
Maximum resolution	1200 x 1200 DPI
Time to first page (black, normal)	9 s
Print speed (black, normal quality, A4/US Letter)	25 ppm
Internal memory	32 MB
Sound power level (standby)	35 dB
Sound pressure level (printing)	53 dB
Total input capacity	250 sheets
Total output capacity	100 sheets
Paper tray media types	Envelopes, Labels, Plain paper, Transparencies
ISO A-series sizes (A0...A9)	A4
Power requirements	220 – 240 V, 50/60 Hz
Power consumption (standby)	70 W
Power consumption (printing)	400 W
Power consumption (PowerSave)	8.5 W
Operating temperature (T-T)	10 - 32 °C
Operating relative humidity (H-H)	20 - 80 %

Weight and Dimensions

Dimensions (WxDxH)	358 x 298 x 253 mm