General and Operation Overview
Phaser 7100 Service Manual Xerox Internal Use Only1-54
ROS Assembly (Laser Unit) (Exposure)
The Laser Unit is an exposure device that emits the laser beam that is used to form the electrostatic
latent image on the Drum surface. The Laser Unit is made up of the following main components:
• Laser Diode (LD) PWB - The PWB where the LD that emit the laser beam for exposing the Drum
surface are installed. It converts the image data that is input from the Image Processor PWB to
the ROS Assembly into laser beam and also controls various other parts in the ROS Assembly.
• Polygon Assembly - This is made up of the Scanner Motor that rotates at a fixed speed and the
Polygon Mirror that is attached to the Motor rotation axis.
• SOS PWB - The Start of Scan (SOS) PWB contains the SOS Sensor. The SOS Sensor converts
incoming laser beam to electric signals that form the scan start reference and then sends the
signals to the MCU PWB.
Note: The Laser Unit (ROS Assembly) is not a serviceable component. The Laser Unit can only be
replaced as a whole assembly. DO NOT disassemble the Laser Unit.
s7100-190
ROS Assembly
Polygon Mirror Assembly
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