A power control device receiving supply of power from a power source, the power control device including: a power accumulator accumulating a part of power from the power source; a first voltage converter receiving power from the power source and the power accumulator, performing voltage conversion to a first target voltage, and supplying power with the first target voltage to a first load; a second voltage converter receiving power from the first voltage converter, performing voltage conversion to a second target voltage, and supplying power with the second target voltage to a second load; a power source monitor monitoring power from the power source; and a power controller lowering the first target voltage to a level that the second voltage converter is capable of converting to the second target voltage when the power source monitor detects that the supply of power from the power source has stopped.

The present invention provides an image forming apparatus and a malfunction diagnosis method of the image forming apparatus. The image forming apparatus stores a diagnosis target of a malfunction in association with a diagnostic item corresponding to the diagnosis target, and in a case where an abnormality is detected, the apparatus specifies the diagnosis target corresponding to the abnormality, executes a malfunction diagnosis process in accordance with the stored diagnostic item in association with the specified diagnosis target, and displays information regarding a malfunction parts determined to be a malfunction by the malfunction diagnosis process. The apparatus executes a malfunction diagnosis processes of a different type depending on whether or not a sheet remaining in the image forming apparatus is detected.

Various embodiments of the present disclosure provide techniques and mechanisms for improving user convenience by displaying the state of a battery of an image forming apparatus in more detail. In a case where the state of the battery is an abnormal state in which the battery is not chargeable, the image forming apparatus displays information indicating that the battery is in the abnormal state and information about a remaining capacity of the battery.

A multifunction device (MFD) includes a print engine, power status monitors, and a user interface. The user interface is at least partially surrounded by a perimeter, and a first light emitting module is positioned to illuminate at least part of the perimeter. The MFD also includes a processor in communication with the first light emitting module and a computer-readable medium containing programming instructions. An MFD may detect a triggering event corresponding to a change in its power status. In response to detecting the triggering event, the MFD may receive information relating to a current power status of the MFD from the power status monitors, identify a dynamic feedback pattern associated with the triggering event, and instruct the first light emitting module to emit a first visual pattern. The dynamic feedback pattern includes the first visual pattern that provides information about the current power status of the MFD to a user.

An apparatus that executes a job, broadcasts a wireless signal prior to establishing a connection by wireless communication with an external apparatus. The wireless signal includes information relating to the apparatus, by which it can be identified whether execution of a job by the apparatus is possible, in a predetermined packet.

A printing system that enables a user to determine the number of sheets that a printing apparatus can print, the number of sheets corresponding to a power supply source that supplies power to the printing apparatus, in any power mode. The printing apparatus performs printing in any of a plurality of power modes including (i) a first power mode in which the printing apparatus is supplied with power from the battery, and (ii) a second power mode in which the printing apparatus is supplied with power supplied from both the battery and an external power supply. In the second power mode, the number of sheets that the printing apparatus can print is calculated based on the remaining battery level of the battery and an amount of power supplied from the external power supply.

An apparatus that executes a job, broadcasts a wireless signal prior to establishing a connection by wireless communication with an external apparatus. The wireless signal includes information relating to the apparatus, by which it can be identified whether execution of a job by the apparatus is possible, in a predetermined packet.

An information processing apparatus includes a power processor, an interface, a detector that detects at least one of a voltage value and a current value on an electric power line that connects the power processor and the interface, and a controller. The controller transmits warning information to an external device via the interface in a case where a detection value of the detector indicates an abnormal value while electric power is supplied to the external device via the interface.

An information processing apparatus for making state transition between a plurality of power states including a suspend state includes one or more controllers having one or more processors and one or more memories. The one or more controllers is configured to function as a control unit configured to, in a case where a state transition to the suspend state fails, inhibit the state transition to the suspend state and then perform a shutdown.

An image forming system comprising: an image forming apparatus capable of transitioning between a standby mode and a sleep mode; and a wireless operation device capable of wireless communication with the image forming apparatus, the wireless operation device including: a display; a battery configured to perform power supply to the display; and a controller configured to control the power supply from the battery to the display, wherein, in response to transition of the image forming apparatus from the standby mode to the sleep mode with a predetermined amount of power being supplied from the battery to the display, the controller makes a supply amount of power from the battery to the display less than the predetermined amount.