An image forming apparatus that uses a plurality of removable cartridges and that is so adapted that a desired cartridge can be exchanged with ease. An implanted subsystem includes a VAD, an Rx resonator that forms a magnetically coupled resonator with the Tx resonator, and a load loop for providing power to the VAD that is inductively coupled to the Rx resonator. The headers are coupled to ribbon conductors in a parallel planar array.