Abstract: An image forming apparatus including an image forming unit to form an image, a user switch unit to output a user operation signal to switch between a power-on state and a power-off state of the image forming apparatus, a main controller to control the image forming unit and to output a power control signal based on the user operation signal, a power switching unit to selectively supply operation power to the main controller based on the user operation signal and the power control signal, and an auxiliary controller to control the power switching unit such that the operation power is not supplied to the main controller when the power control signal is changed in a power-off state.

Abstract: An image forming apparatus including an image forming unit to form an image, a user switch unit to output a user operation signal to switch between a power-on state and a power-off state of the image forming apparatus, a main controller to control the image forming unit and to output a power control signal based on the user operation signal, a power switching unit to selectively supply operation power to the main controller based on the user operation signal and the power control signal, and an auxiliary controller to control the power switching unit such that the operation power is not supplied to the main controller when the power control signal is changed in a power-off state.

Abstract: An image forming apparatus including an image forming unit to form an image, a user switch unit to output a user operation signal to switch between a power-on state and a power-off state of the image forming apparatus, a main controller to control the image forming unit and to output a power control signal based on the user operation signal, a power switching unit to selectively supply operation power to the main controller based on the user operation signal and the power control signal, and an auxiliary controller to control the power switching unit such that the operation power is not supplied to the main controller when the power control signal is changed in a power-off state.

Abstract: An image forming apparatus including an image forming unit to form an image, a user switch unit to output a user operation signal to switch between a power-on state and a power-off state of the image forming apparatus, a main controller to control the image forming unit and to output a power control signal based on the user operation signal, a power switching unit to selectively supply operation power to the main controller based on the user operation signal and the power control signal, and an auxiliary controller to control the power switching unit such that the operation power is not supplied to the main controller when the power control signal is changed in a power-off state.

Abstract: An image forming apparatus including an image forming unit to form an image, a user switch unit to output a user operation signal to switch between a power-on state and a power-off state of the image forming apparatus, a main controller to control the image forming unit and to output a power control signal based on the user operation signal, a power switching unit to selectively supply operation power to the main controller based on the user operation signal and the power control signal, and an auxiliary controller to control the power switching unit such that the operation power is not supplied to the main controller when the power control signal is changed in a power-off state.

Abstract: An image scanning apparatus and method for converting analog signal into digital signal corresponding to an operation mode is disclosed. The image scanning device and method include an input unit for selectively inputting an operation mode based on a document to be scanned, an image sensor for scanning the image of the document corresponding to the selected operation mode in order to output the image as an analog image signal. The apparatus and method also include an analog to digital (A/D) unit for converting the scanned analog image signal into a digital image signal by variably applying an upper reference voltage and a lower reference voltage corresponding to the selected operation mode. The apparatus and method further include a control unit for controlling the A/D unit to convert the analog image signal into the digital image signal corresponding to the selected operation mode.

Abstract: A drive control device for use in an image forming apparatus comprises: a cover sensing unit which detects the opening of a cover of the image forming apparatus; a relay unit which controls supplement of a voltage for driving a laser scanning unit; and a relay operation control unit which controls the operation of the relay unit in response to the detected result of the cover sensing unit. Accordingly, the drive control device of the image forming apparatus can control operation of one or more driving motors and the laser scanning unit at low cost.

Abstract: A drive control device for use in an image forming apparatus comprises: a cover sensing unit which detects the opening of a cover of the image forming apparatus; a relay unit which controls supplement of a voltage for driving a laser scanning unit; and a relay operation control unit which controls the operation of the relay unit in response to the detected result of the cover sensing unit. Accordingly, the drive control device of the image forming apparatus can control operation of one or more driving motors and the laser scanning unit at low cost.

Abstract: An apparatus to and method of controlling a step motor by checking driving pulses to control the operation of the step motor and resetting the apparatus controlling the step motor when signals indicating an abnormal operation, such as stepping out, of the step motor are detected, thereby preventing a fire or damage to parts caused by the abnormal operation of the step motor.

Abstract: An apparatus to and method of controlling a step motor by checking driving pulses to control the operation of the step motor and resetting the apparatus controlling the step motor when signals indicating an abnormal operation, such as stepping out, of the step motor are detected, thereby preventing a fire or damage to parts caused by the abnormal operation of the step motor.

Abstract: An image scanning apparatus and method for converting analog signal into digital signal corresponding to an operation mode is disclosed. The image scanning device and method include an input unit for selectively inputting an operation mode based on a document to be scanned, an image sensor for scanning the image of the document corresponding to the selected operation mode in order to output the image as an analog image signal. The apparatus and method also include an analog to digital (A/D) unit for converting the scanned analog image signal into a digital image signal by variably applying an upper reference voltage and a lower reference voltage corresponding to the selected operation mode. The apparatus and method further include a control unit for controlling the A/D unit to convert the analog image signal into the digital image signal corresponding to the selected operation mode.

Abstract: A facsimile machine including an automatic answering machine with a voice memory checks whether the facsimile is set to an automatic answering mode, upon receiving a ring signal of an incoming call. If the facsimile machine is set to the automatic answering mode, a check is made as to whether or not the voice memory is full. If the voice memory is full, the facsimile machine sends to a caller a memory-full status message requesting the caller to leave call-back information and prints out the received call-back information on a recording sheet. The call-back information is a telephone number of the caller. Therefore, in case of a long absence of the user, the facsimile machine may print out the telephone numbers of the callers on a recording sheet.