A fixing device of the invention switches ON a heater lamp of the press roller in a fixing device in a color print mode. In a monochromatic mode, power comparable to the power consumption of the heater lamp can be supplied additionally to an exciting coil on the heat roller side when a heater lamp 3 stays OFF. An amount needed for the heat roller can be therefore added flexibly to the exciting coil. During a warm-up, power comparable to power consumption of the option can be supplied additionally to the exciting coil on the heat roller side.

 
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< Display device having horizontal power transformer configuration

> Power control method for controlling a setting value of electric power to be supplied to each of components of an apparatus by switching between power control modes depending on a status of operation of each of the components of the apparatus

> Direct type backlight unit having liftable frame structure

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