Specifications

System Overview
Samsung Electronics
Service Manual
3-33
4) LSU
LSU receives the image data from PVC or HPVC and make the latent image on OPC surface.
It uses the dual beam, LD1 and LD2. But the control method of them is the same.
Just in comparison with the single beam, the dual beam has the half of lsu
s frequency.
->The frequency of the dual beam = the frequency of the single beam /2.
The errors related to LSU are as follows:
* By LReady: When the printing is started, the engine drives the polygon motor of LSU. After the specified time is elapsed,
if the motor is not in a ready status, the engine detects the error that the polygon motor is not in a ready status. If this
error happens, the engine stops all functions and keeps it at the error state. Also, the engine informs the error status of
the main system and the error message is displayed at LCD window to inform the error status of the user.
* By Hsync: When the polygon motor is ready, the LSU sends out the signal called Hsync and used to synchronize with
each image line. So, if the engine does not detect consecutively the signal for a fixed time, it defines the Hsync Error. If
this error happens, the engine stops all functions and keeps it at the error state. Also, the engine informs the error status
of the main system and then the error message is displayed at LCD window to inform the error status of the user.
LSU Error Recovery: If the LReady or Hsync error happens, the paper exits out beforehand. The engine mode is
changed to recovery mode and the engine informs the main system of the engine mode. And the engine checks the LSU
error. If the error doesn
t happen, the printing job will be proceeding.