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Product spec and feature
2-13
2.2.3.6 LSU (Laser Scanner Unit)
This is the core of the laser printer. It converts the video data received from the computer into an electrosta-
tic latent image on the surface of the OPC drum. This is achieved by controlling the laser beam and expos-
ing the surface of the OPC drum to the laser light. A rotating polygon mirror reflects the laser light onto the
OPC and each side of the mirror is one scan line. The OPC drum turns as the paper feeds to scan the
image down the page.
The /HSYNC signal is created when the laser beam from LSU reaches the end of the polygon mirror and
this 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 the paper.