Abstract: A power supply system for AC-DC conversion, includes: a first rectifying/smoothing circuit configured to rectify and smooth an AC voltage applied from an AC power supply; a switching power supply configured to perform voltage conversion on an output voltage of the first rectifying/smoothing circuit, and output the converted voltages; an accumulating unit configured to receive a charging current from the switching power supply; a detecting unit configured to detect input/cutoff of the AC power supply; and a control device configured to receive supply of electric power from the accumulating unit and stop the switching power supply if the detecting unit detects the cutoff of the AC power supply.

Abstract: A power control device includes a power control unit, a power switch, a timer unit, a power supply switch, and a connection instruction unit. The power control unit is driven by power supplied from a power source. The power switch outputs a detection signal to the power control unit. The timer unit outputs a switch-on signal for giving an instruction to turn on the switch. The power supply switch switches between connection and non-connection of the power source and a load. The connection instruction unit outputs a connection instruction signal for connecting the power source to the load. The power control unit outputs a stop signal for stopping the output of the switch-on signal to the timer unit before a time point at which the predetermined time elapses when the power is supplied from the power source. The power control unit outputs the switch-on signal to the connection instruction unit.

Abstract: In an image forming device having a plurality of functions, a power measuring unit measures a power consumption of the image forming device, a power consumption computing unit computes a power consumption for execution of one of the plurality of functions based on the measured power consumption, a storage unit stores a target power consumption range for each of the plurality of functions, a measuring mode selecting unit selects one of a measuring mode and a non-measurement mode, and a power consumption estimation unit generates an estimated power consumption for execution of one of the plurality of functions in the non-measurement mode. The measuring mode selecting unit selects the measuring mode when the estimated power consumption in the non-measurement mode is beyond a target power consumption range for a corresponding function from the storage unit.

Abstract: The power supply apparatus includes a transformer having a primary and secondary sides, a first line and a second line to which an AC voltage is input from an AC power supply, a rectifying and smoothing unit that rectifies and smoothes the AC voltage, a shut-off unit provided between the first line and the rectifying and smoothing unit, a switching element that switches a current from the rectifying and smoothing unit to the primary side of the transformer, a first overvoltage detection unit that outputs a voltage corresponding to the AC voltage, a second overvoltage detection unit that outputs an overvoltage detection signal; and a control unit that controls the shut-off unit to shut off the input of the AC voltage.

Abstract: An image forming apparatus executes the steps of: calculating an end time of the job of which execution is instructed, and determining if the end time of the job is before the start time of power outage; specifying, if it is determined that the end time of the job is not before the start time of power outage, a part of processing of the job that can be completed before the start time of power outage; starting the job, if it is determined that the end time of the job is before the start time of power outage; and starting the part of processing of the job if it is determined that the end time of the job is not before the start time of power outage. Thus, abnormal termination of an active job due to power outage can be prevented.

Abstract: An image forming apparatus and method are provided. The image forming apparatus includes a communication interface unit that receives printing data, an image forming unit that performs an ordinary printing to form an image on printing paper based on the printing data, a paper supplying unit that provides the printing paper to the image forming unit along with a paper supplying route, a determination unit that determines whether a functional printing may be performed on the paper supplying route in an interval section between sheets of the printing paper, and a controller that controls the image forming unit to perform a functional printing, wherein the ordinary printing is a printing performed on one or more sheets of printing paper, and the functional printing is a printing performed in an interval section between the sheets of printing paper.

Abstract: An image forming apparatus for controlling power supply is provided. An image forming apparatus includes at least one cover unit to be mounted in the image forming apparatus, at least one replaceable unit to participate in an image forming operation of the image forming apparatus, a sensing unit to sense whether the at least one cover unit is opened or closed, and a main board unit to cut off the power supply to the at least one replaceable unit for a predetermined period of time when the at least one cover unit is opened or closed. Accordingly, stable operation is enabled.

Abstract: A rotary developing device that rotates about a rotational axis includes plural developing units, an energized member, a hollow cylindrical unit, a first energizing member, a rotatable unit, a second energizing member, a first conductive member, and a second conductive member. Each developing unit develops a latent image formed on an image holding member into a visible image, and is rotatable about the rotational axis so as to be sequentially movable to a developing position facing the image holding member. The hollow cylindrical unit is arranged along the rotational axis. The rotatable unit is supported rotatably with respect to the hollow cylindrical unit. One end of the first conductive member is connected to the first energizing member supported on an outer periphery of the hollow cylindrical unit. The second conductive member connects the second energizing member supported by the rotatable unit to the energized member supported in a developing unit.

Abstract: A power supply device includes a first switch section that can disconnect a 24-V power supply from a commercial alternating-current (AC) power supply and that operates with the voltage of 3.3 V, and a second switch section that can disconnect a voltage detection circuit from the commercial AC power supply and that operates with the voltage of 3.3 V. When a power saving mode is on, the 24-V power supply and the voltage detection circuit are disconnected from the commercial AC power supply by using the first and second switch sections, whereby the power supply device can be used in areas where different supply voltages are used, and at the same time reduction in power consumption in the power saving mode is achieved.

Abstract: A power control method for supplying AC power to a first load and a second load is provided. The method includes supplying, to the first load, AC power corresponding to a range of a phase angle 0 to a phase angle ?1 in each half cycle; and supplying, to the second load, AC power corresponding to a range of a phase angle ?2 to a phase angle ? in each half cycle, wherein ?1 is larger than 0 and not more than ?, ?2 is not less than 0 and smaller than ?, and ?1 is larger than ?2.

Abstract: A method for controlling printer energy consumption. The method includes identifying, during a first time interval, a quantity of energy consumed by a printer since commencement of the first time interval; generating a comparison by comparing the quantity of energy with a first energy threshold for the first time interval; and invoking an energy saving mode of the printer based on the comparison.

Abstract: Disclosed is an image forming device including an engine unit that performs image processing; an engine control unit that controls the engine unit; and a controller that generates items of starting information. The controller transmits a first item of the starting information indicating a cause of the starting process, and transmits a second item of the starting information when a content of the second item of the starting information is fixed. A time period required for fixing the second item of the starting information depends on the cause of the starting process. The engine control unit obtains the second item of the starting information, based on the first item of the starting information and timing information obtained in advance that indicates a timing at which the second item of the starting information is expected to be fixed.

Abstract: An earth leakage circuit breaker includes an earth leakage detector, a rectifier, a switching part, and a controller. The switching part is installed on an electric circuit between an alternating current (AC) power supply and the rectifier, and switches between supply and interruption of the power from the AC power supply. The earth leakage detector is installed between the AC power supply and a load. The rectifier rectifies the AC power into direct current (DC) power. The controller causes the rectifier to perform half-wave rectification until earth leakage is detected by the earth leakage detector, and causes the rectifier to perform full-wave rectification when the earth leakage is detected by the earth leakage detector.

Abstract: An image forming apparatus includes: a photoconductor; a charger configured to charge the photoconductor, the charger having a discharge wire and a grid; a charge-voltage applying device configured to generate charge voltage and apply the charge voltage to the discharge wire; and an abnormal-discharge detector provided between an output end portion of the charge-voltage applying device and the ground. The abnormal-discharge detector is configured to detect an abnormal discharge occurring in the charger by detecting an abnormal current passing via the grid and the ground upon occurrence of the abnormal discharge.

Abstract: A protection device includes a pair of electrodes and an output unit. In the pair of electrodes, one electrode, connected to a connection line that connects a load and a power supply that supplies voltage to the load, performs discharge toward the other electrode in response to application, to one electrode, of an abnormal voltage greater than or equal to a pre-set voltage exceeding a steady-state voltage output by the power supply in a steady state. The output unit detects discharge current that flows in the other electrode and outputs the detected discharge current as a control signal.

Abstract: A method for monitoring subsystem power includes, with a power control system of an electronic device, receiving energy usage data from one of a plurality of subsystems within the electronic device, with the power control system, maintaining energy usage data for the plurality of subsystems within the electronic device, and with the power control system, providing integrated energy usage data to one of the plurality of subsystems.

Abstract: In a high voltage power supplying apparatus, a pulse generation unit generates a pulse signal with a predetermined frequency. A piezoelectric transformer outputs a voltage in accordance with the frequency of the pulse signal. A detection unit detects an output voltage of the piezoelectric transformer. A control unit controls the pulse generation unit to change the frequency of the pulse signal by a predetermined value towards a frequency corresponding to a target voltage until the output voltage becomes equal to the target voltage. A storage unit stores data indicating the frequency when the output voltage reaches the target voltage. The control unit controls the output voltage to be equal to the target voltage by variably controlling the frequency of the pulse signal by a value smaller than the predetermined frequency from the frequency corresponding to the data stored in the storage unit.

Abstract: A power supply apparatus including a current regulation unit configured to regulate a surge current generated on a primary side of a piezoelectric transformer. The surge current is generated when the piezoelectric transformer including a piezoelectric element and a holding unit, which are connected to each other using a conductive rubber, is driven.

Abstract: A high-voltage power supply to output a plus/minus high-voltage, which is applied to image forming apparatuses, includes a plus high-voltage output unit outputting the plus high-voltage by using a Pulse Width Modulation (PWM) signal, a minus high-voltage operation control unit charging a certain voltage while the plus high-voltage output unit is outputting the plus high-voltage, a minus high-voltage output unit outputting the minus high-voltage by using the certain voltage charged in the minus high-voltage operation control unit, and a minus high-voltage blocking unit to block the output of the minus high-voltage from the minus high-voltage output unit while the plus high-voltage output unit is outputting the plus high-voltage.

Abstract: An electric power control apparatus sets a first period for performing electric power control and an overall target amount of power consumption to be consumed by all of a plurality of information processing apparatuses during the first period, calculates an individual target amount of power consumption to be consumed by each information processing apparatus during a plurality of second periods obtained by segmentalizing the first period, based on the first period and the overall target amount, transmits the corresponding second period and the individual target amount to each information processing apparatus, receives an actual usage value of the amount of power consumption in the corresponding second period transmitted from each information processing apparatus, calculates the individual target amount, based on the actual usage value of the amount and the overall target amount, and retransmits the individual target amount to each information processing apparatus.

Abstract: An electric power relaying unit of an image forming apparatus which includes an electric power blocking unit which selectively blocks the alternating current electric power output from the electric power input unit to be input to the electric power output unit, the electric power blocking unit including: a switching unit which switches an input of the alternating current electric power with respect to the electric power output unit; an electric power detecting unit which detects an electric power property; a memory unit in which a predetermined electric power property information is stored; and a control unit which controls a switching operation of the switching unit if determining that the detected electric power property corresponds to a predetermined electric power property in a failure of the image forming apparatus main body from a comparison result.

Abstract: An image processing apparatus is provided that includes plural devices, a device control unit associated with each of the devices for controlling a power status of each of the devices according to a relevant power mode, and power mode setting unit for setting the relevant power mode to the device control unit.

Abstract: An image forming apparatus includes a power supply unit to generate DC power, a plurality of function units to perform the functions of the image forming apparatus, a control unit to control the operation of a plurality of function units, a switching unit to receive DC power of the power supply unit and switch power provided to the control unit and each of a plurality of function units, and a power management unit to receive DC power of the power supply unit and to control a switching operation of the switching unit according to an operation mode of the image forming apparatus.

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.

Abstract: An image forming apparatus includes a rotatable image bearing member including an electroconductive base member and a photosensitive member formed on the electroconductive base member; a contact charging device for electrically charging the photosensitive member; a DC voltage applying device for applying a DC voltage to the contact charging device; an exposure device for exposing the charged photosensitive member to light; and a current detecting device for detecting a current passing from the contact charging device to the electroconductive base member of the image bearing member.

Abstract: An image forming apparatus includes a photosensitive member, an exposure unit configured to expose the photosensitive member corresponding to an image, a developing unit configured to develop, using a toner, an electrostatic latent image formed on the exposed photosensitive member, a generation unit configured to generate a waveform signal for the developing unit, a parallel-to-serial conversion unit configured to apply, at a predetermined sampling period, parallel-to-serial conversion to a plurality of signals including the generated waveform signal, a serial-to-parallel conversion unit configured to apply, at the predetermined sampling period, serial-to-parallel conversion to the signals output from the parallel-to-serial conversion unit, and a voltage applying unit configured to apply to the developing unit a voltage composed of a direct-current voltage and an alternating-current voltage superimposed thereon based on the waveform signal among signals output from the serial-to-parallel conversion unit.

Abstract: One aspect of the present invention provides an information processing apparatus comprising: an acquisition unit configured to acquire the print request from the client; a selection unit configured to select the first printing apparatus when the accumulated power consumption is not more than a first threshold, and selects the second printing apparatus when the accumulated power consumption is higher than the first threshold; and an accumulation unit configured to add a power to be consumed by the printing apparatus selected by the selection unit to process the print request to the accumulated power consumption stored in the storage unit.

Abstract: An image processing apparatus includes an image forming unit, power supplier, power controller, memory, signal transmission unit and transmission timer. The image forming unit forms an image based on image data from a plurality of host devices. The power supplier supplies power to a power system including the image forming unit. The power controller controls the power from the power supplier to the power system. The memory stores a usage amount of each host device. The signal transmission unit transmits a response request to a host device having at least a predetermined usage amount. The transmission timer counts a first time period from a transmission of the response request. The power controller halts the power from the power supplier to the power system when determining, based on the first time period, that a reply to the response request is not transmitted from the specific host device for a predetermined period.

Abstract: A detecting unit detects a usage state of a charge storage unit for each predetermined time period. A setting unit determines whether the usage state of the charge storage unit satisfies a predetermined condition for each time period, and when it is determined that the usage state satisfies the predetermined condition, sets a corresponding time period as a charge-use permitted time. A control unit determines whether a current time falls in the charge-use permitted time, and when it is determined that the current time falls in the charge-use permitted time, allows a discharging unit to discharge the charge storage unit.

Abstract: An image forming apparatus including: one or a plurality of photosensitive drums; a plurality of chargers each having a grid, a voltage applying unit generating a charging voltage; a plurality of grid constant voltage circuits, each of the plurality of grid constant voltage circuits including: a voltage detecting unit that detects a voltage based on a grid voltage which is generated in the grid; a first current detecting unit detecting a first current; a voltage control line making the grid voltage constant; and an operation control device performing a feedback control such that the detected voltage has a predetermined voltage value; at least one of a second current detecting units detecting a second current flowing; and a controller controlling the voltage applying unit such that a sum of the first current and the second current corresponding to one of the plurality of chargers becomes a predetermined current value.

Abstract: An image forming apparatus includes a reading unit reading an original document and generating image data; a power source unit supplying power to the reading unit; a power source switching signal output unit outputting a switching signal for switching between supply and shut-off of the power for any one of an image pickup element and an image processing unit; a measuring unit measuring a power stopping time while the power is shut off; a judging unit determining whether to carry out only a first initial setting when the measured power stopping time is less than a predetermined time and whether to carry out both the first initial setting and a second initial setting when the measured power stopping time is the predetermined time or more; and an initial setting unit carrying out only the first initial setting or the second initial setting also upon the determination by the judging unit.

Abstract: A method of controlling a power save mode of an image forming apparatus connected to a host apparatus, the method includes: requesting information on a power mode of the image forming apparatus; transmitting the power mode information and information on an entering time for a power save mode of the image forming apparatus from the image forming apparatus; and displaying the entering time for the power save mode of the image forming apparatus on a basis of the entering time information.

Abstract: An image forming apparatus including a fixing device using an induction heating method determines a driving frequency for a switching element configured to drive an induction coil, according to a difference between a detected temperature of an electrically conductive heating element provided in the fixing device and a target temperature. When the determined frequency is a predetermined minimum frequency and a current flowing through the induction coil is at a predetermined value or less, the image forming apparatus generates a signal indicating the abnormality of electric power supplied to the induction coil.

Abstract: An image forming apparatus for controlling power supply is provided. An image forming apparatus includes at least one cover unit to be mounted in the image forming apparatus, at least one replaceable unit to participate in an image forming operation of the image forming apparatus, a sensing unit to sense whether the at least one cover unit is opened or closed, and a main board unit to cut off the power supply to the at least one replaceable unit for a predetermined period of time when the at least one cover unit is opened or closed. Accordingly, stable operation is enabled.

Abstract: A heating device includes: a heat generating unit generating heat in response to energization of an alternating-current power supply; a zero-crossing signal generating circuit generating a zero-crossing signal in synchronization with a zero-crossing time of the alternating-current power supply; an energization regulating unit regulating an energization period of the heat generating unit by the alternating-current power supply; a voltage change rate detecting unit detecting whether a rate of voltage change of the alternating-current power supply at the zero-crossing time is equal to or larger than an predetermined value; a switching unit switching on and off a connection between the alternating-current power supply and the heat generating unit; and an energization disabling unit disabling energization of the heat generating unit by controlling the switching unit when the rate of voltage change is equal to or larger than the predetermined value.

Abstract: An image forming capable of operating with reliability and shortening the down time. An operation unit forms an image. A power source unit supplies electric power supplied from an external power source to the operation unit. A storing unit stores successful data which shows that the image forming apparatus has started successfully. A mode selection unit selects a first mode in which regular electric power is supplied to the operation unit at a start-up when the storing unit stores the successful data, and a second mode in which electric power smaller than the regular electric power is supplied to the operation unit at the start-up when the storing unit does not store the successful data. A power control unit controls the electric power supplied from the power source unit to the operation unit according to the mode selected by the mode selection unit.

Abstract: A switching mode power supply apparatus includes an alternating current (AC) power input unit to receive an AC voltage from an AC power supply source, a first rectifier to output a direct current (DC) voltage by rectifying the received AC voltage, a pulse width modulation (PWM) signal generator to output a PWM signal, a transformer to transform the DC voltage output from the first rectifier into an AC voltage according to a turn ratio and outputting the AC voltage according to the PWM signal, a second rectifier to output a DC voltage by rectifying the AC voltage output from the transformer, a feedback unit to provide as feedback a change of the DC voltage output from the second rectifier to the PWM signal generator, a DC power input unit to receive a DC voltage from a DC power supply source, a DC voltage input detector to detect whether a DC voltage is input to the DC power input unit based on connectivity with the DC power input unit, and an AC power input controller to stop input of the AC voltage from the

Abstract: Part of a plurality of power levels of control patterns selected to control power supplied from an AC power source to a heater of an image forming apparatus include power levels of a) waveforms in which power is supplied in part of negative and positive half cycles in order after no power supply during a one half of a positive half cycle, and waveforms in which power is supplied in part of a positive cycle after no power supply during one half of a negative half cycle, or b) waveforms in which power is supplied in part of positive and negative half cycles in order after no power supply during one half of a negative half cycle, and waveforms in which power is supplied in part of a negative half cycle after no power supply during one half of a positive half cycle.

Abstract: A power supply unit includes a switching circuit that drives a switching device by a duty ratio corresponding to a target voltage output value and outputs an alternating current signal; a coupling capacitance element provided in a subsequent stage with respect to the switching circuit; a voltage transformation unit that increases a voltage of the alternating current signal input by using the switching circuit, and outputs a high-voltage alternating current voltage to an electrifying unit; a charging unit that charges the coupling capacitance element in response to a power supply voltage being turned on; and a control unit that controls driving of the switching device to cause the coupling capacitance element to be charged to a predetermined charged amount before the switching circuit starts outputting the alternating current signal.

Abstract: Provided is a method of controlling electric power of a coil which performs induction heating in an imaging apparatus. The method includes: detecting an input current of the coil; detecting a resonant current of the coil; calculating a difference between the detected resonant current and the detected input current; and controlling electric power supplied to the coil based on the difference. These operations are repeatedly performed whenever the detected input current is changed.

Abstract: A heating device includes: a heat generating unit generating heat in response to energization of an alternating-current power supply; a zero-crossing signal generating circuit generating a zero-crossing signal in synchronization with a zero-crossing time of the alternating-current power supply; an energization regulating unit regulating an energization period of the heat generating unit by the alternating-current power supply; a voltage change rate detecting unit detecting whether a rate of voltage change of the alternating-current power supply at the zero-crossing time is equal to or larger than an predetermined value; a switching unit switching on and off a connection between the alternating-current power supply and the heat generating unit; and an energization disabling unit disabling energization of the heat generating unit by controlling the switching unit when the rate of voltage change is equal to or larger than the predetermined value.

Abstract: When electric power supply is started in response to a power switch being turned on, a control unit determines whether a stored operation mode is a normal mode or a power saving mode with reference to the stored operation mode. More specifically, the control unit determines whether a digital multifunction peripheral is set to operate in the normal mode or the power saving mode before electric power supply to the digital multifunction peripheral is stopped. If the set operation mode is the normal mode, the control unit controls the digital multifunction peripheral to operate in the normal mode. If the set operation mode is the power saving mode, the control unit controls the digital multifunction peripheral to operate in the power saving mode.

Abstract: An image forming apparatus according to the present invention includes: a fixing part having a heater; a control part controlling ON/OFF of power distribution to the heater; a power source part generating a voltage for driving the control part; a main switch for turning ON/OFF power supply from outside to the power source part; and an interrupt signal generation part generating a periodical interrupt signal. The control part, based on the interrupt signal, controls ON/OFF of the power distribution to the heater, turns OFF power supply to the heater upon passage of predetermined time since disappearance of the interrupt signal, and judges that an error has occurred, when the control part is still driving after passage of driving stop time from when the main switch is turned OFF to when the control part stops its driving since the disappearance of the interrupt signal.

Abstract: According to one aspect of the present disclosure, a print system is provided comprising a plurality of networked print engines in communication with one another, a presence detector, and a controller to communicate with the presence detector to determine a user presence and to access usage data of each of the plurality of print engines. The controller combines and shares the user presence and the usage data to adjust operations of the plurality of print engines enabling quick entry to, and quick exit from, power saving mode of at least two of the plurality of print engines.

Abstract: A heating device including: a heat generating unit configured to receive an AC voltage from a power supply; a zero-crossing signal generating unit configured to generate a zero-crossing signal which is a square pulse signal synchronizing with a zero-crossing timing of the AC voltage, the zero-crossing signal being a first level at the zero-crossing timing and being a second level at other timings; and a control device configured to perform a detecting process in which an abnormality in a frequency or an output wave of the power supply or is detected, and an error processing, in a case where the abnormality in the frequency of the power supply or the abnormality in the output waveform of the power supply is detected and the level of a zero-crossing signal at a detection timing of detecting the abnormality is the second level.

Abstract: A switching-mode power supply (SMPS) for an image forming apparatus which may prevent an overvoltage supplied to the SMPS, and damage to circuits in the SMPS in the image forming apparatus. The SMPS includes a rectifying circuit to rectify an alternating-current (AC) voltage input from an external power supply source into a direct-current (DC) voltage, a transformer to transform the rectified DC voltage input to a primary coil and output the transformed DC voltage to a secondary coil, a main switch that is connected to the primary coil and switches an output of the transformer, a first overvoltage detecting unit to determine whether the rectified DC voltage is an overvoltage by comparing the rectified DC voltage with a first reference voltage, and a switching control unit to control a switching operation of the main switch based on a result of the determination.

Abstract: Methods and apparatus for adjusting printing device power consumption based on previously acquired usage data. The printing device has multiple energy consumption states including at least a ready state in which the printing device is ready to commence processing of a print job immediately upon receipt and including at least a low power state where the printing device is not ready to commence processing of a newly received print job. Acquired usage data includes parameters of print jobs submitted during a data collection period of time. The parameters may include time and date of submitted print jobs. Based on the usage data a usage profile is determined. The usage profile identifies one or more high usage periods of time and one or more low usage periods of time. Methods and apparatus then switch the printing device among the multiple energy consumption states based on the usage profile.

Abstract: An image forming apparatus includes: an attachment unit configured to receive at least one voltage and being replaceable with a test tool, a controller for controlling operation of a plurality of voltage generating circuits, a current detecting section and a deciding section. The controller is configured to control a first voltage generating circuit so as to generate a test voltage and so as to apply the test voltage through a first voltage line, the test tool, and a second voltage line to a second voltage generating circuit. The deciding section is configured to, upon a detection current corresponding to the applied test voltage and detected by the current detecting section being equal to or greater than a first predetermined value, decide that the predetermined voltages are to be normally applied through the respective first and second voltage lines to the attachment unit.

Abstract: An image forming apparatus includes a voltage applying unit for applying a voltage to an electric load; a sub control unit for controlling the voltage applying unit; a restarting unit for restarting the sub control unit in response to receipt of a restart signal; a determining unit for determining whether or not a restart of the sub control unit is an abnormal restart; and a main control unit. The main control unit generates a control start signal for allowing the voltage applying unit to start generation of the voltage, and the restart signal. When the determining unit determines that the restart of the sub control unit is an abnormal restart, the main control unit sends again the control start signal to the sub control unit.

Abstract: An image forming apparatus for forming an image based on image data, includes: a power source for supplying power to various sections of the apparatus; a display section for displaying; and a control section for executing a controlling regarding operations of the apparatus, wherein the control section is provided with a normal power supply mode representing a state of normal power supply, and a power supply mode for operator part replacement representing the state of power supply different from said normal power supply mode, the power supply mode for operator part replacement to which an operator changes the state of power supply on changing a part or a unit of the apparatus.