Patent ID: 8862919

Claim:
An image forming apparatus comprising: an image forming unit which forms an image; a power supply which supplies operating power for the image forming apparatus; a switching circuit unit which switches to selectively supply the operating power; a memory unit which stores information about power status of the switching circuit unit; a controller which outputs a power control signal to control a switching operation of the switching circuit unit in accordance with the information about the power status stored in the memory unit if power is abnormally shut off and then supplied again from the power supply to the switching circuit unit; and a key input unit through which a user input related to supply of the operating power is received, wherein the switching circuit unit comprises a first switch turned on/off in response to the user input into the key input unit, and a second switch turned on/off in response to the power control signal of the controller, wherein the controller reads the information about the power status from the memory unit and outputs the power control signal for turning on/off the second switch to match with the read information about the power status if power is supplied to the switching circuit unit without a user input to the first switch and the first switch is in an “off” status, and wherein the second switch is coupled between a general output port of the controller and the first switch.