| 摘要 |
A warm-up operation control section performs warm-up operation of a fixing-side rotation unit and a pressure-side rotation unit from start-up until the temperature of the fixing-side rotation unit exceeds a first specified value based on an output of a heating-side thermistor in forming a monochrome image. In forming a color image, the warm-up operation control section performs warm-up operation of the fixing-side rotation unit and the pressure-side rotation unit from start-up until the temperature of the pressure-side rotation unit exceeds a second specified value based on an output of a pressure-side thermistor. Time required for the temperature of the fixing-side rotation unit to exceed the first specified value is set shorter than time required for temperature of the pressure-side rotation unit to exceed the second specified value.
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