Power-saving type electrophotography apparatus suitable for use with optional unit having exclusive power supply

摘要

In order to provide a color electrophotography apparatus satisfying a power-saving specification fully by turning off the power supply to various parts so as to reduce the watt consumption when the parts are unnecessary, such as in a power-saving mode, the duplexer, which is optional to the color electrophotography apparatus, has a unit to indicate to the control device of the color electrophotography apparatus whether or not the electric power is to be fed from an electric power supply in the color electrophotography apparatus.