Service manual

System Layout

M000/M009 6-8 SM

6.3.5 LSU (LASER SCANNER UNIT)

The LSU is the core part of this laser beam printer which switches from the video data

received, to the controller, to the electrostatic latent image on the OPC drum, by controlling

the laser beam, exposing the OPC drum, and the turning principle of the polygon mirror.

The OPC drum is turned at the same speed as the paper feed speed. The /HSYNC

(Horizontal Synch) signal is created when the laser beam from LSU (Laser Scanning Unit)

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 the paper. One side of the polygon mirror is one line for scanning.

CÓPIA NÃO CONTROLADA