Abstract: In a heater unit for heating a sheet stored in a cassette, respective heating wires of a plurality of heater wires are arranged along an outer periphery of a heat transfer plate so as not to overlap each other, respective power supply wires of the plurality of heater wires are arranged inside a path formed by the heating wires, and both ends of each of the plurality of heater wires are connected to a connector.

Abstract: The power source board is arranged at a lower side on the back side of the main body of the image forming apparatus. The load control board is arranged at an upper side in a vertical direction of the power source board in such a manner that the load control board does not overlap with the power source board. For a board and load at a lower side when viewed from a load control board, a connector is arranged near the lower side of the load control board. For a board and load at an upper side of the load control board, a connector is arranged near the upper side of the load control board. Similarly, for boards and loads of right and left side, connectors are arranged near the respective right and left sides of the load control board.

Abstract: When a detection signal indicates that a switch has switched off, a first relay cuts off the supply of alternating current from a commercial alternating-current source to a third DC power source and terminates a first load such as a motor and a high-voltage power source. When the detection signal indicates that the switch has switched off, a control circuit executes shutdown processing for safely terminating an operation of a second load such as a hard disk drive. When the shutdown processing is complete, the control circuit outputs a signal for terminating an operation of a second DC power source. When the shutdown signal is input, a second relay terminates the operation of the second load by cutting off the supply of the alternating current from the commercial alternating-current source to a second DC power source.