Lsu (Laser Scanner Unit) - Samsung CLX-4195N Service Manual

2. Product specification and description

2.2.4.5. LSU (Laser Scanner Unit)

It is the core part of the LBP ( Laser Beam Printer ) which switches from the video data received to the controller to the
electrostatic latent image on the OPC drum by controlling laser beam, exposing OPC drum, and turning principle of polygon
mirror. The OPC drum is turned with the paper feeding speed. The HSYNC signal is created when the laser beam from LSU
reaches the end of the polygon mirror, and the signal is sent to the controller. The controller detects the HSYNC signal to
adjust the vertical line of the image on paper. In other words, after the HSYNC signal is detected, the image data is sent to
the LSU to adjust the left margin on paper. The one side of the polygon mirror is one line for scanning.
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