Xerox 3300MFP - Phaser B/W Laser, Руководство по обслуживанию

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Phaser 3300MFP Service Manual 2-35
Theory of Operation
LSU
The LSU receives image data from PVC or HPVC and makes a latent image
on OPC surface. It uses the dual beam, LD1 and LD2. But the control method
of each is the same.
Compared to the single beam, the dual beam has half of the 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.