Patent ID: 8644718

Claim:
An image forming apparatus that rotationally moves a plurality of developing material storage units that store a developing material to thereby perform printing, the image forming apparatus comprising: a moving unit configured to rotationally move the developing material storage unit; a switching unit configured to switch the operation mode of the image forming apparatus to either a first operation mode that prioritizes avoiding an error relating to the developing material or a second operation mode that prioritizes a monochrome printing performance; and a determination unit configured to determine the operation mode of the image forming apparatus when an error relating to a color developing material different from a black developing material has been detected, wherein the moving unit moves a developing material storage unit that stores a developing material for which the error has been detected to a different position depending on the determination of the operation mode of the image forming apparatus by the determination unit, and wherein, when the determination unit determines that the operation mode of the image forming apparatus is the first operation mode and the number of times a monochrome printing job has been executed is equal to or greater than a threshold value without resolving the error, the switching unit switches the operation mode of the image forming apparatus to the second operation mode.