Laser Unit - Ricoh Aficio BP20 Service Training

Slide 43
5. Engine
More on the Laser Unit
The OPC drum rotates as the paper feeds to scan the image down the page.
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Technical Training Centre
LSU converts video data into an electrostatic
latent image on the surface of the OPC drum.
This gets done by controlling the laser beam and
exposing the surface of the OPC drum to the
laser light.
Polygon mirror reflects the laser light onto the
OPC drum. Each side of the mirror is one scan
line.
A /HSYNC signal gets created when the laser beam from LSU gets to
the end of the polygon mirror.
Then the signal goes to the controller.
The controller detects the /HSYNC signal to adjust the vertical line of
the image on paper.

Laser Unit

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