A method for adjusting a printing apparatus includes an analyzing stage of performing, by an image analysis apparatus, analysis on a pattern image generated by reading a test pattern by a scanner, and a setting value updating stage of updating a control setting value stored in a database, in which the printing apparatus is caused to print a test pattern including a pattern for ejecting ink from a plurality of nozzle rows to the same position in a main scanning direction, in the analyzing stage, a dot position misalignment amount occurring in each nozzle row is detected by image processing based on the pattern image, a dot position correction value corresponding to the dot position misalignment amount is calculated by calculation, and in the setting value updating stage, the database is caused to store the dot position correction value as at least a part of the control setting value.

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 printing method using a printing apparatus, the printing apparatus including: a liquid ejecting head including: a channel substrate having an individual channel; and a piezoelectric actuator having an individual electrode, a high potential electrode and a low potential electrode and applying pressure to liquid inside the individual channel, a driving power source circuit electrically connected to the individual electrode; a high potential power source circuit electrically connected to the high potential electrode; and a conveyor to convey a medium, the printing method comprising: ejecting the liquid from the liquid ejecting head with respect to the medium conveyed by the conveyor so as to print an image on the medium; and changing an output voltage value of each of the driving power source circuit and the high potential power source circuit while printing the image on the medium.

A drive circuit board includes a drive circuit that includes a first driver circuit, a first switching element pair configured to output a first switching signal, a second driver circuit, a second switching element pair configured to output a second switching signal corresponding to the first switching signal, a smoothing circuit configured to output the drive signal obtained by smoothing the second switching signal, and a bootstrap circuit that includes a first capacitor, shifts a level of a power supply voltage to be supplied to the first switching element pair, and supplies the power supply voltage to the second switching element pair, wherein a distance between the first capacitor and the first switching element pair is longer than a distance between the first capacitor and the second switching element pair.

A liquid discharge apparatus in which a level shift circuit executes, one or a plurality of times according to a voltage value of a capacitor included in a bootstrap circuit detected by a voltage detection circuit, a second control of outputting a third gate signal for controlling a third transistor to be non-conductive and a fourth gate signal for controlling a fourth transistor to be conductive, and then, outputting the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be non-conductive.

A head unit include an ejection unit for ejecting a liquid, a waveform shaping circuit to which a first residual vibration signal corresponding to a residual vibration is input, and which outputs a second residual vibration signal, and a determination circuit, wherein an amplifier circuit provided to the waveform shaping circuit outputs an offset voltage signal in a first state in which a first constant voltage signal is input to a first input terminal and a second constant voltage signal is input to a second input terminal, and outputs the second residual vibration signal in a second state in which the first residual vibration signal is input to the first input terminal, and the second constant voltage signal is input to the second input terminal, and the determination circuit determines the state of the ejection unit based on the second residual vibration signal and an offset value.

A method of inkjet printing includes applying a driving signal to a head through a controller, the head including nozzles, driving the head in response to the driving signal, and applying a first control signal that changes a driving waveform of the driving signal to the head through the controller.

A printing system comprising a pen comprising a number of print bars; each print bar comprising a number of printheads in which the printheads are grouped to a number of printheads from each of the number or print bars, the grouped printheads forming a slice and in which the printheads of the slice are electrically coupled to a common power supply unit. A printing pen comprising a number of print bars in which each of the number of print bars comprises a number of printheads, in which the number of printheads are grouped together to form a slice, the slice comprising a printhead from each of the print bars, and in which the slice is powered by a common power supply unit.

A liquid discharging apparatus includes a modulation portion that generates a modulation signal obtained by pulse-modulating a source signal; a switching element that generates an amplification modulation signal obtained by amplifying the modulation signal; a low-pass filter that generates a driving signal by demodulating the amplification modulation signal; a piezoelectric element that is displaced by applying the driving signal; a selection portion that is configured to include a transistor and selects whether or not the driving signal is applied to the piezoelectric element; and a detection portion that detects lowering of a power source voltage supplied to the selection portion. The detection portion performs control for lowering a voltage of the driving signal if lowering of the power source voltage is detected.

A liquid ejecting apparatus 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 that is applied; and an ejecting unit that includes a piezoelectric element which becomes displaced in accordance with the 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.