Xerox PHASER 6121MFP - Page 63

Phaser 6121MFP Service Manual 2-21
Theory of Operation
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.
s6121mfp-281
Photoconductor
Semiconductor Laser
SOS Board
Polygon Motor