Fusing; Lsu - Samsung CLX-330x Series Service Manual

2.2.6.3. Fusing

The temperature change of the heat roller's surface is changed to the resistance value through the use of a thermistor.
The Main Board uses the resistance value of the Thermistor and converts it to a voltage value through the use of an AD
converter, the temperature is decided based on the voltage value read. The AC power is controlled by comparing the target
temperature to the value from the thermistor. If the value from the thermistor is out of controlling range while controlling the
fusing, the error stated in the below table occurs.
•
Open Heat Error
When the engine operates the warm-up process, if the temperature of the fixing unit is not higher than a specified
temperature, the engine defines Open Heat Error. When this error is detected, the engine stops all functions and keeps
the error state. Also, the engine informs the error status of the main system, so it can take appropriate action; and then
the error message is displayed at LCD window or LED informing the error status of the user.
•
Low Heat Error
When the engine is at stand-by, printing or warm-up mode, if the temperature of the fixing unit is lower than the
specified temperature at each state and the lower temperature state is maintained during the specified time, the engine
defines Low Heat Error. When this error is detected, the engine stops all functions and keeps it at the error state. Also,
the engine informs the error status of the main system, so it can take appropriate action; and then the error message
is displayed at LCD window or LED informing the error status of the user.
•
Over Heat Error
For overall engine state, if the temperature of the fixing unit is higher than the specified temperature and the temperature
state is detected for a specific duration, then the engine defines Over Heat Error. When this error is detected, the engine
stops all functions and keeps it at the error state. Also, the engine informs the error status of the main system, so it
can take appropriate action; and then the error message is displayed at LCD window or LED informing the error
status of the user.

2.2.6.4. LSU

LSU receives the image data from PVC or HPVC and make the latent image on OPC surface. It uses the single beam,
LD. 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 is exited before the error code is initiated. 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.
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2. Product specification and description
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