2. Product specifi cations and descriptions
Service Manual
ML-331x/371x series
2-40
Samsung Electronics
2.2.6.3 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 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 fi xing unit is not higher than a
specifi ed temperature, the engine defi nes 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 fi xing unit is lower than
the specifi ed temperature at each state and the lower temperature state is maintained during the specifi ed
time, the engine defi nes 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 fi xing unit is higher than the specifi ed temperature and the
temperature state is kept during the specifi ed time, the engine defi nes 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.
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