Samsung SCX-4200 Series Service Manual page 46

System Overview
3.3.16 LSU Error
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.
Service Manual
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