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 power source apparatus includes a plurality of first power sources, each connected to a load through a power supply line, and at least one second power source, which is a sub power source to be used when the first power source is unable to output a predetermined voltage. The second power source is connected in parallel to the power supply line of at least one of the first power source through a diode. The second power source is provided on an anode side of the diode, the load is configured to operate at a voltage equal to or more than a first voltage, the first power source outputs a second voltage higher than the first voltage, the second power source outputs a third voltage, which is higher than the first voltage, the voltage output through the diode from the second power source being lower than the second voltage.

In some examples, a controller includes an interface to receive an indication based on an electrical current through a device, and a processor to send control data to the device to operate the device, detect a measurement based on the indication that is responsive to an operation of the device according to the control data, and determine whether an issue exists in the device responsive to determining whether the measurement satisfies an expected property based on the control data.

An embodiment of the present disclosure is a driving circuit for ejecting liquid from a plurality of nozzles in an ejecting section in a liquid ejecting head. The driving circuit includes a first signal generation section that generates a printing driving signal for ejecting the liquid from the nozzles, a second signal generation section that generates an inspection driving signal for inspecting a state of the ejecting section, and a control section that controls the first signal generation section and the second signal generation section so as to exclusively output one of the printing driving signal and the inspection driving signal to the ejecting section.

A printing apparatus includes: power supply circuits including at least a first power supply circuit and a second power supply circuit, the power supply circuits having mutually different output voltages; and a head including nozzles, the nozzles forming groups arranged in a first direction, each of the nozzles being associated with any one of the power supply circuits. The groups include a first group and a second group adjacent to each other in the first direction. The first group is formed by nozzles associated with the first power supply circuit and nozzles associated with the second power supply circuit. The second group is formed by nozzles associated with the first power supply circuit and nozzles associated with the second power supply circuit.

A liquid discharge method of discharging a liquid from a nozzle of a liquid discharge head by applying a drive pulse to a drive element of the liquid discharge head includes an acquisition step of acquiring a recording condition, and a driving step of applying the drive pulse to the drive element. The drive pulse includes a first potential, a second potential different from the first potential, and a third potential different from the first potential and the second potential. The second potential is to be applied after the first potential, and the third potential is to be applied after the second potential. In the liquid discharge method, in the driving step, the drive pulse in which a time of the third potential varies depending on the recording condition acquired in the acquisition step is applied to the drive element.

A drop ejector array device includes a first plurality and a second plurality of drop ejectors that are alternatingly disposed along an array direction on the substrate surface. A voltage input terminal and a current return terminal are disposed on the substrate surface. A first power bus line connects the first plurality to the voltage input terminal. A second power bus line connects the second plurality to the voltage input terminal. The second power bus line is electrically connected to the first power bus line by a primary power bus connector line. A first current return bus line connects the first plurality to the current return terminal. A second current return bus line connects the second plurality to the current return terminal. The second current return bus line is electrically connected to the first current return bus line by a primary current return bus connector line.

An electroprinting system having a voltage generator that produces a signal, a drop-on-demand (DOD) droplet generator actuated by the signal of the voltage generator, the drop generator having a wire for submersion into a viscous fluid, a power supply connected to the wire for supplying current to the DOD droplet generator, and a grounded collector for collection of the droplet generated by the DOD droplet generator. The drop-on-demand (DOD) droplet generator has a wire for plunging or threading through a meniscus of a viscous fluid, and an applied electrical potential to form a droplet from the viscous fluid. A method of electroprinting of a viscous fluid is also provided.

A drop ejector array device includes a first plurality and a second plurality of drop ejectors that are alternatingly disposed along an array direction on the substrate surface. A voltage input terminal and a current return terminal are disposed on the substrate surface. A first power bus line connects the first plurality to the voltage input terminal. A second power bus line connects the second plurality to the voltage input terminal. The second power bus line is electrically connected to the first power bus line by a primary power bus connector line. A first current return bus line connects the first plurality to the current return terminal. A second current return bus line connects the second plurality to the current return terminal. The second current return bus line is electrically connected to the first current return bus line by a primary current return bus connector line.

An image forming apparatus includes a print head, a main control unit, a head control unit, and a head unit power supply to generate a voltage to be supplied to the head control unit. The main control unit checks whether the main control unit is normally started up. The head control unit includes an operation checker to check whether the head control unit normally operates if the main control unit is normally started up and the head control unit is supplied with a check voltage, a head power supply generator to generate a voltage to be supplied to the print head if the head control unit normally operates, and a status detector to detect a status of the print head based on the voltage supplied to the print head, and control the voltage to be supplied to the head control unit depending on the status detected by the status detector.