Samsung SCX-4200 Series Service Manual page 45

3.3.15 Temperature
3.3.15.1 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 informing the error status of the user.
3.3.15.2 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 informing the error status of the user.
3.3.15.3 Over Heat Error
For overall engine state, if the temperature of the fixing unit is higher than the specified temperature and the temper-
ature 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 sys-
tem. And then the error message is displayed at LCD window to inform the error status of the user.
To recover the heat error: The heat error recovery is operated automatically when the error is only caused by Low
Heat Error, not the Heat Errors in Warm-up state and the Over Heat Error. If an error happens, then the engine
memorizes a present temperature. In case of Low Heat Error, the maximum heat is supplied to the fixing unit.
When a specified time is elapsed, the engine detects the temperature again. If the present temperature is higher
than the memorized temperature, the error is recovered. In case of Over Heat Error, no heat is supplied to the
fixing unit. When a specified time is elapsed, the engine detects a present temperature again. If the present
temperature is a specified degree lower than the memorized temperature, the error is recovered.
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