Patent ID: 7761022

Claim:
An image forming apparatus comprising: a main body; a cover hinged to the main body; a power-supply unit, to generate a first voltage and a second voltage; an image forming engine, to receive the first voltage from the power-supply unit; a control unit to receive the second voltage from the power-supply unit, and to stop an operation of the image forming engine when the second voltage is cutoff; and a power-supply cutoff unit to delay a cutoff time of the first voltage, as compared to a cutoff time of the second voltage, the power supply cut-off unit comprising: a first switching unit to cutoff the first voltage; and a second switching unit to cutoff the second voltage, wherein, if the cover is fully open, a contact is broken between the first switching unit and the cover, such that the first switching unit is switched off, and if the cover is partially open, a contact is broken between the second switching unit and the cover, such that the second switching unit is switched off.