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.

There is provided an image reading apparatus in which a low output mode is a mode that can be controlled in a coupling state where a low power-feeding USB device is coupled, a high output mode is a mode that can be controlled in a coupling state where a high power-feeding USB device capable of feeding power higher than the low power-feeding USB device is coupled, and a control section does not perform image reading at a second reading speed faster than a first reading speed and performs image reading at the first reading speed in the low output mode.

A plurality of groups are arranged in a light emitting device. Each of the groups includes a plurality of light-emitting elements, a plurality of transistors arranged corresponding to the plurality of light-emitting elements and configured to supply current to the plurality of light-emitting elements, and a group control transistor configured to control current flowing through the plurality of transistors. The plurality of groups have a first group and a second group. The first group has a plurality of light-emitting elements. The second group has a plurality of light-emitting elements. A light-emitting element of the second group is arranged between one light-emitting element of the first group and the other light-emitting element of the first group.

Printing devices herein comprise an internal power supply within the body of the printing devices. Also, a processor and printing components are within the body and connected to the internal power supply. A user interface is external to the body and is connected to the processor and the internal power supply. The user interface has a universal serial bus (USB) connection. A USB hub structure is within the body and is connected to the processor, the internal power supply, and the user interface. The USB hub structure includes an integrated circuit (IC), a power connector connected to the internal power supply, and a plurality of USB connectors connected to the IC. The USB connectors can extend through the body and one of the USB connectors connects the USB connection of the user interface to the processor and the internal power supply.

A image forming apparatus includes a power control unit, an operation mode control unit, and a first timer. The power control unit performs control so as to switch between a normal power state for supplying the operation power supply voltage to the image forming unit, a first power saving state for not supplying the operation power supply voltage to the image forming unit, and a second power saving state having less power consumption than the first power saving state. The operation mode control unit performs control so as to switch a normal mode corresponding to a normal power state, a first power saving mode corresponding to a first power saving state, and a second power saving mode corresponding to a second power saving state.

A printer includes: a board including a connector unit that includes at least a power supply connector into which a power cable is to be removably inserted; and a housing including: a housing main body that accommodates the board and includes a cable connection groove through which the power cable is inserted in an inserting and removing direction of the power cable; and a connector cover configured to cover the cable connection groove, wherein the connector cover includes: a cover main body including a power supply opening portion passing through the cover main body in the inserting and removing direction, and a first interface opening portion passing through the cover main body in the inserting and removing direction; and a first opening cover portion configured to cover at least a part of the first interface opening portion, wherein the first opening cover portion includes a first coupling portion configured to couple the first opening cover portion and the cover main body to each other.

A CPU of a printer requests a first external device to supply electric power via a first interface through communications according to the USB standard. When the CPU determines that the requested electric power is to be unsupplied from the first external device, the CPU requests a second external device to supply the electric power via a second interface.

An information processing apparatus, including an interface and a controller configured to: receive, from an external device, first change acceptable or non-acceptable information indicating whether changing of an amount of electric power to be supplied to the external device is allowable; supply, after the receiving the first change acceptable or non-acceptable information, the electric power to the external device; receive, during executing the supplying the electric power, second change acceptable or non-acceptable information indicating whether the changing of the power amount is allowable; determine, during executing the supplying the electric power, whether limiting of the power amount is necessary; and limit, based on the second change acceptable or non-acceptable information, the power amount when the controller determines to limit the power amount in the determining whether limiting of the power amount is necessary and the receiving the second change acceptable or non-acceptable information is executed.

A printing apparatus connectable to an external power supply having outputtable voltage information, including: a printing head performing printing by electric power supplied from the external power supply; a resistor having an electric resistivity based on the printing head; a detector detecting a substantial voltage; and a controller configured to: obtain the voltage information from the external power supply; decide a tentative voltage; request the external power supply to output the tentative voltage; energize the resistor with the tentative voltage; decide the substantial voltage if a voltage corresponding to each of the obtained voltage information is supplied based on a result of the detector during the energizing of the resistor; decide an electric power supply voltage based on the substantial voltage; and request the external power supply to output the electric power supply voltage.

A CPU of an MFP receives battery information from a first external device via a first interface, determines whether a total amount of electric power supplied to a plurality of interfaces from a power supply is maintained, and reduces an amount of the electric power supplied to the first external device via the first interface in a case where determining that the first external device has no battery based on the battery information in response to determining that the total amount of the electric power supplied to the plurality of the interfaces from the power supply is not maintained.