Xerox Phaser 6115MFP Service Manual page 61

Phaser 6115MFP Multifunction Product Service Manual
Laser Write Process
1. The laser light strikes the polygon mirror.
2. The four-sided polygon mirror rotates at high speeds driven by the
polygon motor.
3. The Start-of-Scan (SOS) Sensor monitors laser light emission and
initiates timing for each line of the scanning process.
Photo Conductor
Laser Write Timing
When a Ready signal is detected after the print cycle begins, a Laser On
signal is output from the Engine Control Board. The Laser On signal triggers
each laser diode illuminating the SOS Board and generating an SOS signal.
The SOS signal is used to synchronize the timing at which the laser write
each scan line.
The print start position in the CD direction is determined by the CD Print Start
signal (/HSYNC) that is output from the Image Processor Board and the width
of the paper.
The print start position in the FD direction is determined by the Image Write
Start signal (TOD) that is output from the Image Processor Board and the
length of the paper. The laser emission area is determined by the paper size.
Theory of Operation
Semiconductor Laser
SOS Board
Polygon Motor
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