Misalignment of printing positions between print heads associated with thermal expansion is reduced without increasing a data processing load. To this end, printing element substrates in a reference head and an adjustment target head are adjusted to a target temperature, and a liquid is circulated through the print element substrates. After thermal expansion of the reference head and the adjustment target head reaches a steady state, a first printing region being a printing region of the reference head and a second printing region being a printing region of the adjustment target head in a longitudinal direction are obtained from an image printed by using all printing elements. Then, used regions to be used for actual printing are set among the printing elements arranged on the reference head and the adjustment target head based on the first printing region and the second printing region.

A liquid discharge head includes an actuator substrate including a pressure chamber communicating with a nozzle from which a liquid is to be discharged and a pressure generator to apply pressure to the liquid in the pressure chamber, a frame bonded to the actuator substrate and having a through hole filled with a resin, and a temperature detector inserted into the through hole and attached to the actuator substrate with the resin to detect a temperature of the actuator substrate. The through hole has a first face facing the actuator substrate and a second face opposite to the first face and facing an opening of the frame. The resin in the through hole includes an uncured portion uncured and facing the first face and a cured portion cured and facing the second face. The uncured portion contacts the actuator substrate and is between the cured portion and the actuator substrate.

A liquid circulation device includes a circulation passage, a liquid feeding device, a pressure sensor, and control circuitry. Through the circulation passage, liquid circulates to be supplied to and collected from a circulatory liquid discharge head. The liquid feeding device is configured to circulate the liquid through the circulation passage. The pressure sensor is configured to detect a pressure of the circulation passage. The control circuitry configured to acquire a characteristic indicating a relationship among a drive amount of the liquid feeding device, discharge information of the liquid discharged from the liquid discharge head, and a pressure detection value of the circulation passage; and change, based on the characteristic acquired, at least one of a control parameter and a calculation expression used to control the liquid feeding device.

In some examples, a fluid dispensing device includes a plurality of fluidic actuators, and a plurality of sense measurement storage elements to store sense measurement indicators for indicating whether sense measurement is to be performed for fluidic actuators of the plurality of fluidic actuators. The fluid dispensing device further includes a controller to control setting of the sense measurement indicators in the sense measurement storage elements to select which fluidic actuator is to be subject to a sense measurement.

In one example in accordance with the present disclosure, a fluidic die is described. The fluidic die includes an array of firing subassemblies grouped into zones. Each firing subassembly includes 1) a firing chamber, 2) a fluid actuator, and 3) a sensor plate. The fluidic die also includes a measurement device per zone to measure a voltage indicative of an impedance within a selected firing chamber. The fluidic die includes a selector per firing subassembly to couple a selected sensor plate to the measurement device. A selector is adjacent a respective firing subassembly and a distance between the selector and the measurement device is different as compared to other selectors.

An inkjet printer detects vibrations within the printer and compensates for the detected vibrations by adjusting a gap between the printheads and the media transport. Additionally, the inkjet printer detects media sheet heights that may cause damage as they pass through the print zone of the printer and adjusts the gap to enable the media sheets to pass through the print zone without contacting the printheads. A method of operating an inkjet printer so configured is also disclosed.

Misalignment of printing positions is reduced in a print head that circulates an ink between a printing apparatus and the print head in a case where the misalignment is apt to change dynamically along with heat deformation. To this end, printing element substrates in the print head are adjusted to a target temperature and then a liquid is circulated through the print element substrates. After thermal expansion of the print head reaches a steady state, an amount of misalignment of printing positions in a direction of conveyance of the print head is obtained by using a test pattern printed by using printing elements. Further, a correction value for correcting the misalignment of the printing positions is set based on the obtained amount of misalignment of the printing positions.

Example implementations relate to current leakage testing of a fluid ejection die. For example, a fluid ejection die may include plurality of nozzles, each nozzle among the plurality of nozzles including a nozzle sensor and a fluid ejector. The plurality of nozzle sensors may comprise a first subset and a second subset, each nozzle sensor among the plurality of nozzle sensors of the first subset may be electrically coupled to a first control line by a respective switch among a first group of switches, and each nozzle sensor among the plurality of nozzle sensors of the second subset may be electrically coupled to a second control line by a respective switch among a second group of switches. The fluid ejection die may include a control circuit to perform a current leakage test of the plurality of nozzles using the first control line and the second control line.

A print component integrated circuitry package includes a number of temperature sensors where each of the plurality of the temperature sensors is disposed in a corresponding temperature region of an integrated circuitry. In an example, an analog sense bus conductively connects to all of the plurality of temperature sensors and an external sensor pad that is to connect to a corresponding print controller contact.

An integrated circuit for a print component including a number of memory bits. The integrated circuit may include a selection circuit to select at least one memory bit of the number of memory bits and fire actuators of a fire pulse group. The integrated circuit may include a memory voltage regulator to provide a write voltage to the at least one memory bit of the number of memory bits.