A color printer has multiple developing-agent-containing cartridges each having
storage units, and a cartridge holding unit for rotatably holding the developing-agent-containing
cartridges. With one of the multiple developing-agent-containing cartridges positioned
at an image formation position, a latent image on an image carrying member is developed
by the developing agent contained in the developing-agent-containing cartridge.
An access position where the storage units of the developing-agent-containing cartridges
are accessed is a position other than the image formation position. This provides
an image formation device and a control method thereof whereby storage units provided
to developing-agent-containing cartridges can be accessed in a precise manner.
