Samsung ML-1665 Service Manual page 25

2.2.3.5 LSU (Laser Scanner Unit)
It is the core part of the LBP 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.
Photo Diode
LD Driver circit
Protector panel
Service Manual
Product spec and feature
LD(Laser Diode)
2-15
OPC Drum
Polygon Mirror
Polygon Motor
Motor Driver
Samsung Electronics