An example device includes a physical interface to connect to a system. The device also includes a power source to deliver power to a diagnostic portion of the system via the physical interface. The diagnostic portion draws a small amount of power. The power source delivers the power based on the system not receiving power from an internal source. The device also includes a reporting engine to communicatively couple to the system via the physical interface. The reporting engine retrieves an indication of whether a cable in the system is connected.

In one example in accordance with the present disclosure, a fluidic die is described. The fluidic die includes an array of fluid actuators grouped into zones. Each zone has at least one comparator to compare at least one of a representation of a supply voltage and a return voltage supplied to a zone of fluid actuators against a supply voltage threshold. Each zone also includes at least one sample and hold device to 1) receive and store the voltage threshold during a predetermined period and 2) pass the voltage threshold to the at least one comparator during evaluation.

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.

A printhead includes a printing element; a first power supply wiring configured to be electrically connected to one terminal of the printing element and supply power to the printing element; a transistor configured to be electrically connected to another terminal of the printing element and drive the printing element; a first ground wiring configured to be electrically connected to a source of the transistor; a second ground wiring configured to be electrically connected to a back gate of the transistor; and a first capacitive element configured to be electrically connected, at one terminal thereof, to the first ground wiring and electrically connected at another terminal thereof, to the second ground wiring.

A drive circuit that drives a piezoelectric device including a drive signal selection control circuit which controls supply of the drive signal to the piezoelectric element, the drive circuit including a drive signal output circuit that outputs the drive signal, a power supply voltage signal output circuit that outputs a power supply voltage signal, and a power supply voltage control circuit that controls supply of the power supply voltage signal to the drive signal selection control circuit, in which the drive signal output circuit includes a modulation circuit, an amplification circuit, a demodulation circuit, a feedback circuit, and a discharge circuit, a first wiring electrically couples the drive signal selection control circuit and the power supply voltage control circuit to each other, and the discharge circuit is electrically coupled to a second wiring through which the drive signal output from the demodulation circuit propagates, through the feedback circuit.

An ink jet head includes an actuator, a driver IC, a first capacitor, a second capacitor, and a fuse. The actuator is configured to cause ink to be discharged from nozzles. The driver IC is configured to drive the actuator. The first capacitor is connected between a ground line and a first node of a power supply line connected to the driver IC. The second capacitor is connected between a ground line and a second node of the power supply line. A capacitance of the second capacitor is less than a capacitance of the first capacitor. The fuse is on the power supply line between the first node and the second node.

A printing apparatus has a conveyance roller configured to convey a sheet in a first direction, an encoder provided at the conveyance roller, a head having a plurality of nozzles aligned in a second direction intersecting with the first direction and being configured to jet liquid to the sheet which is conveyed in the first direction by the conveyance roller and a controller having a power circuit configured to apply voltage to the head for jetting the liquid. The controller is configured to: determine a jetting frequency for the head based on a signal outputted from the encoder; and change an output voltage of the power circuit depending on the determined jetting frequency.

A liquid ejecting apparatus includes a drive circuit that outputs a drive signal, a piezoelectric element that includes a first electrode to which the drive signal is supplied and a second electrode to which a reference voltage signal is supplied and that is displaced by a potential difference between the first electrode and the second electrode, a cavity that is filled with a liquid ejected from a nozzle according to the displacement of the piezoelectric element, a vibration plate that is provided between the cavity and the piezoelectric element, a detection circuit that detects whether or not a voltage variation of the drive signal is within a predetermined range, and a determination circuit that determines whether or not the drive signal is normal based on a detection result of the detection circuit.

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 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.