A magnet assembly includes a ring shaped magnet having a face with an inner surface that is removably attachable to a ferrous metal housing of a fluid filter. The pre-transfer guide extends in a width direction of a sheet conveying path, and projections are formed on opposite end portions of the pre-transfer guide on sides outer than an area on which a sheet is conveyed. The set of instructions is configured to cause the processor to receive a selection of content from a user accessing the apparatus, and determine whether the user is authorized to receive the content. The rectifier component also includes at least one biasing element coupled to the pump node and configured such that its terminal voltages vary with phases and amplitudes similar to that of the second phase of the RF waveform.