Abstract: An electronic device includes a supply circuit board having a switching power supply circuit for outputting DC voltages in conformity with a type of commercial power, and a control circuit, which is connected to the supply circuit board, for performing control in accordance with the type of the commercial power. The control circuit discriminates the type of commercial power based upon a voltage value that is the result of dividing a DC voltage by the supply circuit board, and changes over control of a fixing heater in dependence upon the type of commercial power discriminated. When the door of an image forming apparatus is opened, the supply circuit board halts the supply of DC to a high-voltage circuit, thereby suppressing the generation of high voltage, and the control circuit is notified of the fact that the door has been opened.

Abstract: The image forming apparatus is provided with a driving circuit board for driving an apparatus main body, a control circuit board for controlling the apparatus main body, and an image controller board for controlling image data, in which the driving circuit substrate and the image controller board are arranged substantially vertically, and the control circuit board is arranged substantially horizontally. Consequently, a high-frequency wiring part can be shortened, and reduction of radiation field noises and costs for coping with the noises can be realized. Moreover, since heat radiation efficiency increases, deterioration of components and degradation of an image quality due to increase in temperature inside the apparatus can be prevented.

Abstract: An electronic device includes a supply circuit board having a switching power supply circuit for outputting DC voltages in conformity with a type of commercial power, and a control circuit, which is connected to the supply circuit board, for performing control in accordance with the type of the commercial power. The control circuit discriminates the type of commercial power based upon a voltage value that is the result of dividing a DC voltage by the supply circuit board, and changes over control of a fixing heater in dependence upon the type of commercial power discriminated. When the door of an image forming apparatus is opened, the supply circuit board halts the supply of DC to a high-voltage circuit, thereby suppressing the generation of high voltage, and the control circuit is notified of the fact that the door has been opened.

Abstract: The image forming apparatus is provided with a driving circuit board for driving an apparatus main body, a control circuit board for controlling the apparatus main body, and an image controller board for controlling image data, in which the driving circuit substrate and the image controller board are arranged substantially vertically, and the control circuit board is arranged substantially horizontally. Consequently, a high-frequency wiring part can be shortened, and reduction of radiation field noises and costs for coping with the noises can be realized. Moreover, since heat radiation efficiency increases, deterioration of components and degradation of an image quality due to increase in temperature inside the apparatus can be prevented.

Abstract: A heating apparatus comprising a heating member, energization element for energizing said heating member, a temperature detection member for detecting a temperature of said heating member, a first switching element for turning on/off energization by said energization means on the basis of the temperature detected by said temperature detection member, abnormal current detection element for detecting an abnormal current flowing through said heating member, a second switching element for turning off energization by said energization element, and energization stop member for operating said second switching element to turn off energization.

Abstract: An image recording apparatus operated in synchronism with a vertical synchronization signal from an external device comprises a unit for sending out to the external device a signal indicating a status to accept the vertical synchronization signal, and switching device for switching between a plurality of operation modes related to an elapsed time from the send-out of the signal by the signal sending unit.

Abstract: The present invention provides an image forming apparatus in which the first lead wire which transmits a detection signal indicating the remaining amount of toner in the developing unit into a circuit for comparison with the reference voltage, and the second lead wire are arranged parallel. One end of the second lead wire is connected to the reference voltage generating side and the other end is electrically open.

Abstract: A sheet stacking apparatus includes a sheet discharge outlet, sheet stacker for receiving sheet materials discharged through the sheet discharge outlet, a support for supporting the sheet stacker for substantially vertical movement, or driver for moving the sheet stacker in a substantially vertical direction, a control device for controlling the driver to move the sheet stacker down in the substantiallly vertical direction through a predetermined distance each time a predetermined amount of the sheet materials is stacked on the sheet stacker, and a detector for detecting fullness of the sheet stacker by detecting the sheet stacker at a lower limit level which is changed in accordance with sizes of the sheet materials.