An inkjet recording device includes a hardware processor. The hardware processor: performs, for respective recording heads of a recorder, setting relevant to adjustment of an amount of ink to be discharged from nozzle groups; based on ink discharge amount information on a distribution of ink discharge amounts that are discharged from the nozzle groups based on image data, performs the setting such that at each joint in the nozzle groups, a difference between representative values of the ink discharge amounts of the nozzle groups satisfies a predetermined continuity condition, and a representative value of the ink discharge amounts of the nozzle groups satisfies a predetermined discharge amount condition; and adjusts at least a part of the setting such that a difference between a maximum value and a minimum value of the ink discharge amounts of the nozzle groups reduces.

An inkjet recording apparatus includes: a tank having an ink chamber; a recording head; a memory; a display; an operation interface; a power switching section; and a controller. The power switching section is configured to be switched between a first state where an electric power is supplied to the recording head and the display and a second state where supply of an electric power to the recording head and the display is interrupted. After the power switching section is switched from the second state to the first state, the controller executes a query process to: display a query screen inquiring whether the ink chamber has been refilled with ink; and receive one of a first operation and a second operation. In response to receiving the first operation indicating that ink chamber has been refilled with ink, the controller executes an initialization process to initialize a count value.

Methods and apparatus to control a heater associated with a printing nozzle are disclosed. A method comprising controlling a heater associated with a printing nozzle to reduce a heat output of the heater based on a determination that the printing nozzle is outside a print area and printing an image on a substrate using other printing nozzles while the heat output of the heater is reduced.

A printhead circuit or driving at least two actuating elements has a trim generating circuit for generating a trim signal using a comparator coupled to receive and compare feedback indicative of a present level of a drive voltage, with a configurable reference voltage value. The trim being based on a drive voltage feedback can give a more direct indication of actuating element output than given by timing references. Hence the trim can be more accurate, can be simpler, without accurate digital timing references, and thus costs can be reduced. It can be combined with a cold switch arrangement.

A liquid discharge apparatus includes a liquid chamber including a discharge orifice; a supplying unit configured to supply a pressurized liquid to the liquid chamber; a first valve member provided in the liquid chamber and including a valve portion configured to open and close the discharge orifice; a moving unit configured to move the first valve member; and a stirring mechanism configured to stir the pressurized liquid in the liquid chamber.

A printing apparatus that has a plurality of functions including a printing function and is capable of executing printing with resolution of 300 dpi or more includes a plurality of operating units including a printing unit and a power supply unit. The power supply unit includes a substrate, an input terminal that receives an alternating voltage, a smoothing capacitor that smooths the alternating voltage, a thermistor that detects a temperature, and a comparator that compares a signal output from the thermistor with a standard signal and outputs a notification signal. The input terminal, the smoothing capacitor, the thermistor, and the comparator are mounted on the substrate. The supply of power from the power supply unit is stopped based on the state of the notification signal. A gap between the input terminal and the thermistor is longer than a gap between the input terminal and the smoothing capacitor.

A controller of an inkjet recording apparatus is configured to calculate an energized time length during which a timer is in an energized state after a particular calculation start point for calculating a lapse time length based on a time measured by the timer and store the energized time length, determine whether there exists a non-energized state after the calculation start point, estimate the non-energized time length, referring to the energized time length and a time length parameter stored in a memory when it is determined that there exists the non-energized state after the calculation start point, and calculate the lapse time length elapsed from the calculation start point based on the non-energized time length estimated in the estimation process and the energized time length stored in the memory.

A drive circuit includes an amplification unit that amplifies a signal and outputs the amplified signal toward a node; and a voltage output unit that outputs a voltage responding to the signal toward the node during a predetermined period of a part or all of a period in which a magnitude of a voltage change of the signal is less than or equal to a threshold. The amplification unit includes a differential amplifier, a selector, and transistors, and the voltage output unit includes a linear amplifier and a switch.

A drive circuit for driving a capacitive load includes a power supply unit that boosts a single voltage and includes multiple voltage boosting circuits which generate power supply voltages different from each other; a drive circuit that amplifies an original drive signal based on a power supply voltage which is generated by at least one of the multiple voltage boosting circuits and generates a drive signal; in which the power supply unit controls the voltage boosting circuit, which generates the power supply voltage that is not used for amplification, to stop voltage boosting.

A battery-powered printer includes a battery receptacle in which a battery is detachably mounted, a printing mechanism driven by electric power output from the battery during printing on a recording medium, and processor configured to identify a type of the battery mounted in the battery receptacle according to output capacity, and change a drive parameter under which the printing mechanism is driven, depending on the identified type of battery.