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SUMMARY OF PRODUCT
Samsung Electronics
Service Manual
4.2.6 LSU (Laser Scanner Unit)
The LSU unit is controlled by the video controller. It scans the video data received from video controller
with laser beam by using the rotation principal of the polygon mirror to create the latent image on the OPC
drum. It is the core part of LBP.
The OPC drum rotates as the same speed as the paper feeding speed. It creates the /HS YNC signal and
sends it to the engine when the laser bean of the LSU reaches the end of the polygon mirror, and the
engine detects the /HS YNC signal to arrange the vertical line of the image on the paper. After detecting
the /HS YNC signal, the image data is sent to the LSU to arrange the its left margin on the paper.
The one side of the polygon mirror is one line for scanning.
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