An energy saving setting unit controls an image forming apparatus that makes a transition to a power saving state if a transition time passes without any prescribed operation in a normal state, and it includes: a unit for storing specific day information distinguishing a normal operation day and a specific day; an auto pattern updating unit determining the transition time in a normal operation day based on past operational status of the normal operation day of the image forming apparatus; a specific day pattern registering unit receiving and storing setting of the transition time of the specific day; and a switching unit, switching the state of conduction of the image forming apparatus using the transition time determined by the auto pattern updating unit and the stored transition time, on the normal operation day and on the specific day, respectively, based on the specific day information.

A device including a replaceable component, in which the component is not electrically connected to the device and includes a component-side storage, a component-side transmitter/receiver, a component-side hardware processor, and a component-side power generator, the device includes a main-body side storage, a counter which counts up the consumption degree of the component stored in the main-body storage, a main-body side transmitter/receiver, a main-body side hardware processor, a main-body side power generator, and a detector which detects attachment and detachment, the main-body side hardware processor causes the main-body side transmitter/receiver to transmit the specific identification information of the component and the consumption degree of the component when detachment is detected, and the component-side hardware processor rewrites the information in the component-side storage on the basis of the specific identification information of the component and the consumption degree of the component.

An electronic apparatus includes a convertor, and a discharge circuit, and a controller. The convertor controls supply of power to a load according to one of a state of a switch and an operational mode of the electronic apparatus. The discharge circuit discharges a capacitor of a power supply when the convertor stops operating. The controller detects completion of discharge performed with the discharge circuit according to a voltage in the discharge circuit, and restores operation of the convertor in response to a detection of the discharge completion detector indicating the completion of the discharge of the capacitor, when the switch is in the closed state or when the operational mode is switched from the sleep mode to the operating mode.

A job storage unit stores a print job. An image forming unit forms a toner image on a sheet. A fixing unit fixes the toner image on the sheet by heating the toner image. A first authentication unit communicates with a communication medium in a first communication range. A second authentication unit communicates with the communication medium in a second communication range. A control unit controls the fixing unit to be heated if the print job associated with user information is stored in the job storage unit when the first authentication unit acquires the user information, and controls the fixing unit to be heated if the print job associated with the acquired user information is not stored in the job storage unit when the second authentication unit acquires the user information.

An image forming apparatus comprising: a receiver for receiving a print job; a printing unit; a storage unit; an input interface for receiving a print execution command from a user; a power source for supplying an electric power; and a controller configured to: control the power source to stop or reduce the power supply to the printing unit when the receiver has not received a next print job within an after-printing standby time from completion of the printing; and control the power source to stop or reduce the power supply to the printing unit when the print job is a print-execution-command-input required print job requiring the print execution command and the receiver has not received a next print job within an after-print-job-receipt standby time from the receipt of the print-execution-command-input required print job, the after-print-job-receipt standby time being longer than the after-printing standby time.

An image processing apparatus is provided with a main controller unit that comprehensively controls the image processing apparatus, and a microcomputer that controls a load. During a period in which the image processing apparatus transitions from a first power mode to a second power mode having lower power consumption than the first power mode, the main controller unit prohibits acceptance of an interrupt signal, and cancels the prohibition of interrupts when the transition to the second power mode completes. Meanwhile, when an interrupt signal is generated from the load during the transition period, the microcomputer repeatedly notifies the interrupt signal as a pulse signal to the main controller unit, and notifies by changing the pulse signal to a level signal when prohibition of interrupts is cancelled.

An image processing apparatus includes a human sensor, an operation unit for performing various settings, and a control unit capable of switching an operation mode between a normal mode and a sleep mode. In a case where no inputting from the operation unit occurs in a first set time, the control unit switches from the normal mode to the sleep mode. In a case where a human body is detected by the human sensor, the control unit switches from the sleep mode to the normal mode. In the normal mode, when the human sensor no longer detects a human body or the human sensor detects a human body leaving, the control unit clears a setting of the operation unit and starts counting down a second set time set for switching from the normal mode to the sleep mode.

An image forming apparatus is provided with: an image forming unit having a photosensitive member, a charger, and a developer carrier, the image forming unit being configured to transfer the developer image to a recording sheet to form an image on the recording sheet; a motor configured to drive the photosensitive member and the developer carrier; a controller configured to control the motor and the charger, and a re-conveyance mechanism configured to reverse the recording sheet discharged from the image forming unit and to convey the recording sheet back towards the image forming unit. The controller is configured to turn off the charger after the motor is turned off, during a time period after the recording sheet is discharged from the image forming unit until the recording sheet is re-conveyed to the image forming unit by the re-conveyance mechanism.

The printing apparatus of the present invention is a printing apparatus including: a power source switch that switches a power source to on or off; a control circuit configured to control supply or shutoff of power from the power source; and a measurement unit configured to measure a predetermined set time after the power source switch is switched to off, and the predetermined set time is set in accordance with processing being performed, and the control circuit performs control, in a case where the power source switch is switched to off, so as to shut off supply of power from the power source in accordance with completion of termination preparation of the processing being performed or completion of measurement of the predetermined set time in the measurement unit.

An image forming apparatus includes: an accepting unit to accept user operations to transition the apparatus from a standby state to a power save state; a detecting unit to detect objects around the apparatus; and a power control unit to transition the apparatus from the power save state to the standby state according to detection of an object by the detecting unit, and to transition the image forming apparatus from the standby state to the power save state according to user operations accepted at the accepting unit. The power control unit prohibits the apparatus from transitioning from the power save state to the standby state according to the detection of the object, until a user, which performed operations accepted by the accepting unit to transition the apparatus from the standby state to the power save state, thereafter ceases to be detected by the detecting unit.