Samsung ML-1665 Service Manual - Page 34

Fusing

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Product spec and feature 2.2.5.3 Fusing The temperature change of the heat roller's surface is changed to the resistance value through the thermistor. By converting the voltage value, which impressed to the resistance, to the digital value through the AD converter, the temperature is decided. The AC power is controller 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 broken out, the engine stops all functions and keeps the error state. Also, the engine informs the error status of the main system. 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 broken out, 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 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 kept during the specified time, the engine defines Over Heat Error. When this error is broken out, 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 or LED to inform the error status of the user. 2.2.5.4 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 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. Service Manual 2-24 Samsung Electronics

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Product spec and feature
Service Manual
2-24
Samsung Electronics
2.2.5.3 Fusing
The temperature change of the heat roller’s surface is changed to the resistance value through the thermistor.
By converting the voltage value, which impressed to the resistance, to the digital value through the AD
converter, the temperature is decided. The AC power is controller 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 broken out, the engine stops
all functions and keeps the error state. Also, the engine informs the error status of the main system. 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 broken out, 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 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 kept during the specified time, the engine defines Over Heat Error. When this error is
broken out, 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 or LED to inform the
error status of the user.
2.2.5.4
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 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.