Samsung CLP-31 Series Service Manual page 23

① Cassette
• Feeding Method : Cassette Type
• Feeding Standard : Center Loading
• Feeding Capacity : Cassette 150 Sheets(75g/ ㎡ , 20lb Pa per Standard)
• No Manual Feeder
• Paper Detecting Sensor : Photo Sensor (Empty, Registration, Exit)
• Paper Size Sensor : None
② LSU(Laser Scan Unit)
The LSU unit is controlled by video controller. It scans the video data received from video controller with
laser beam by using the rotation principle 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 /HSYNC signal and
sends it to the engine when the laser beam of the LSU reaches the end of the polygon mirror, and the
engine detects the /HSYNC signal to arrange the vertical line of the image on the paper. After detecting
the /HSYNC signal, the image data is sent to the LSU to arrange the its margin on the paper.
• Consisted of LD(Laser Diode) and Polygon Motor Control.
Error
Polygon Motor Error
Hsync Error
Service Manual
Product spec and feature
Phenomenon
The Rotation of Polygon Motor can not reach stable
Though the rotation of Polygon Motor reach stable, the signal of Hsync is
not occurred
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