Xerox WorkCentre PE16 Service Manual page 29

Summary of product
4.2.6 LSU (Laser Scanner Unit)
The LSU is controlled by the video controller. It converts the received video data to pulsed laser light that
is scanned onto the surface the OPC drum using a rotating polygon mirror. This creates the latent image on
the drum surface. The OPC drum rotates at the same speed as the paper is fed. When the edge of the poly-
gon mirror is detected, the LSU generates the /HSYNC signal. The CPU syncs the left margin of the image
to this signal. After detecting the /HSYNC signal, the image data is sent to the LSU to begin transfer of the
image left margin to the paper.
Each surface of the polygon mirror provides one line for scanning.
Service Manual
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WorkCentre PE16 July 2003