Image forming apparatus

An image forming apparatus that forms a target image for forming an image on a printing medium using a toner as a colorant, comprising:

• a transport device that transports the printing medium;
• an image forming device that forms a toner image of the target image on the printing medium transported by the transport device;
• a fixing device that heats the printing medium after the toner image is formed by the image forming device, and fixes the toner image to the printing medium as the target image;
• a motor that drives the fixing device and outputs a signal having a magnitude value corresponding to a value of a driving current of the motor;
• and
• a controller that
• drives the motor in a first operation mode or a second operation mode,
• performs a first operation where the magnitude value of the signal has fallen out of a first range while driving the motor in the first operation mode, and
• performs a second operation where the magnitude value of the signal has fallen out of a second range while driving the motor in the second operation mode, the magnitude value of the signal in the second range being different from that of the signal in the first range, wherein
• the first operation mode is an operation mode in which the motor is driven at a first RPM, and
• the second operation mode is an operation mode in which the motor is driven at a second RPM different from the first RPM.