In one example in accordance with the present disclosure, a fluidic die is described is described. The fluidic die includes an array of fluid actuators grouped into zones. Each zone includes a number of fluid actuators and at least one fault detection device. The fault detection device includes a comparator to compare at least one of a representation of a supply voltage and a return voltage supplied to the zone against a voltage threshold. The fault detection device also includes a fault capture device to store an output of the comparator.

In a liquid discharge apparatus, a circuit substrate includes a first terminal group provided on a first surface and a second terminal group provided on a second surface. The first terminal group includes a first terminal to which a first signal is input, a second terminal to which a second signal is input, and a third terminal to which a reference voltage signal is input. The second terminal group includes a fourth terminal electrically coupled to the first terminal, a fifth terminal electrically coupled to the second terminal, and a sixth terminal electrically coupled to the third terminal. The first terminal and the second terminal are arranged side by side. The third terminal is not located between the first terminal and the second terminal. The fourth terminal and the fifth terminal are arranged. The sixth terminal is located between the fourth terminal and the fifth terminal.

A liquid discharging apparatus includes a drive signal output circuit outputting a drive signal, a drive portion including a discharging head that discharges a liquid onto a medium based on the drive signal, a solid-state battery supplying electric power to the drive signal output circuit, a supporting portion supporting the drive signal output circuit, and a housing accommodating the drive signal output circuit, the drive portion, the solid-state battery, and the supporting portion, in which the housing includes a first housing surface that intersects a discharging direction, which is a direction in which the liquid is discharged from the discharging head, and the solid-state battery is positioned between the first housing surface and the supporting portion.

In an example, an apparatus is described that a fluid ejection device to dispense fluid. A local service controller controls dispensing of the fluid by the fluid ejection device under a direction of a fluid ejection controller. The local service controller also initiates, autonomously of the fluid ejection controller, capping of the fluid ejection device in response to the detection of a failure condition by the local service controller. Capping mechanics are provided to cap the fluid ejection device under the direction of the local service controller.

A liquid-droplet ejecting apparatus includes: N nozzles; N driving elements; M power supply circuits that create a driving signal to be selectively supplied to the N driving elements; and N selecting circuits that selectively connect one of the M power supply circuits to a corresponding one of the N driving elements. The N driving elements are connected to the M power supply circuits in a first combination until a particular condition is satisfied. The first combination is a combination between the M power supply circuits and an M driving element groups, into which the N driving elements are divided based on a voltage of the supplied driving signal. The N driving elements are connected to the M power supply circuits in a second combination after the particular condition is satisfied. The second combination is another combination between the M driving element groups and the M power supply circuits.

A printing apparatus that performs printing by using a print head includes a first power supply, a second power supply, and a control unit. The first power supply supplies a first voltage to the print head through a first supply line. The second power supply supplies a second voltage to the print head through a second supply line. The control unit supplies the first voltage from the first power supply without supplying a voltage from the second power supply at the time of an inspection of the print head, and executes a process action concerning a current leakage when a voltage exceeding a predetermined first threshold is generated on the second supply line.

A method of controlling a liquid ejecting apparatus that includes a liquid ejecting head having nozzles configured to eject a liquid, pressure chambers communicating with the nozzles, and drive elements configured to change the volume in the pressure chambers, and a drive-waveform generating circuit configured to generate a drive waveform for driving the drive elements to vibrate the liquid in the nozzles is provided. The method includes detecting a power-off operation for issuing an instruction for turning off an electric power of the liquid ejecting apparatus and vibrating the liquid by driving piezoelectric elements by the drive waveform in response to detecting the power-off operation by the detecting.

A print head control circuit controls an operation of a print head that includes a nozzle plate and has a self-diagnosis function performed based on signals input from a first coupling point, a second coupling point, a third coupling point, and a fourth coupling point. The print head control circuit includes a first cable that includes a first power voltage signal propagation wiring for propagating a first power voltage signal, and a second cable that includes a first diagnosis signal propagation wiring for propagating a first diagnosis signal input to the first coupling point. A shortest distance between the nozzle plate and the first cable is longer than a shortest distance between the nozzle plate and the second cable.

Heating is conducted sequentially by dividing a heating operation into first heating control and second heating control consuming higher electric power than that in the first heating control.

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.