a≥b≥0, p≥1, q≥1, where a is a number of pairs each consisting of two adjacent first head units, b is a number of pairs each consisting of two adjacent second head units, p is a number of first head units, and q is a number of second head units.

A printhead control circuit outputs a first signal to a second wire while a first wire coupled to a first terminal is being supplied with a first voltage signal; outputs a second signal to the second wire coupled to a second terminal while the first wire is being supplied with a second voltage signal; outputs a third signal to the second wire while a third wire coupled to a third terminal is being supplied with a third voltage signal; outputs a fourth signal to the second wire while the third wire is being supplied with a fourth voltage signal; and thereby causes the printhead to perform abnormality detection in response to the first to fourth signals and the first to fourth voltage signals.

The plurality of first nozzles and the plurality of second nozzles are arranged such that a distance between nozzles adjacent to each other in a first direction is a first distance, the support body is provided with a first fixing portion for fixing the first head unit onto the support body and a second fixing portion for fixing the second head unit onto the support body, and a distance between the first fixing portion and the second fixing portion in the first direction is a second distance that is different from an integral multiple of the first distance.

A recording device includes a sandwiching member coming into contact with a first guide shaft at a guide shaft-side contact surface and disposed between a carriage and the first guide shaft in a second direction and a cam member coming into contact with a first curved surface of the sandwiching member and configured to rotate about a first direction as a rotation axis relative to the carriage in a state of being engaged with the carriage. The cam member presses the first curved surface with the second curved surface slidably fitted to the first curved surface in the second direction and changes a position of the carriage relative to the sandwiching member in the second direction as a distance in the second direction of a position at which the second curved surface presses the first curved surface relative to the rotation axis changes along with rotation of the cam member.

A liquid ejection head includes: head units arranged in a first direction; first individual heat dissipators each corresponding to one of the head units and disposed on a first side of the head unit in a second direction; and a first common heat dissipator disposed on the first side of the head units in the second direction. The first common heat dissipator extends in the first direction and shared among the head units. Each head unit includes: a unit body including an actuator; and a first driver integrated circuit disposed on the first side of the unit body in the second direction. Each of the first individual heat dissipators is disposed between the first driver integrated circuit and the first common heat dissipator of the head unit so as to be in thermal contact with the first driver integrated circuit and the first common heat dissipator.

A liquid ejecting apparatus includes a head, and a drive signal output unit that outputs a drive signal. The head unit includes a first rigid substrate, and a first connector to which the drive signal is input, the drive signal output unit includes a second rigid substrate, and a second connector from which the drive signal is output, the first connector includes a first fixing portion fixed to the first rigid substrate, and a first terminal, the second connector includes a second fixing portion fixed to the second rigid substrate, and a second terminal, the first connector has a receptacle shape, the second connector has a plug shape, and the first rigid substrate and the second rigid substrate are electrically coupled by fitting the first connector and the second connector so that the first terminal and the second terminal are in direct contact with each other.

A liquid ejecting apparatus includes a head unit, and a drive signal output unit that outputs a drive signal. The head unit includes a first rigid substrate, and a first connector to which the drive signal is input, the drive signal output unit includes a second rigid substrate, and a second connector from which the drive signal is output, the first connector includes a first fixing portion, and a first terminal, the second connector includes a second fixing portion, and a second terminal, one of the first connector and the second connector has a receptacle shape, the other has a plug shape, the first connector and the second connector are fitted so that the first terminal and the second terminal are in direct contact with each other, and at least one of the first fixing portion and the second fixing portion is tin-plated.

A liquid ejecting apparatus includes a head unit, and a drive signal output unit that outputs the drive signal. The head unit includes an ejection portion that ejects a liquid, a first rigid substrate, and a first connector including a first terminal, the drive signal output unit includes a second rigid substrate, a second connector including a second terminal that outputs the drive signal, a D/A converter, and a drive signal output circuit, the first connector is provided on the first rigid substrate, the second connector, the D/A converter, and the drive signal output circuit are provided on the second rigid substrate, one of the first connector and the second connector has a receptacle shape, the other has a plug shape, and the first connector and the second connector are fitted so that the first terminal and the second terminal are in direct contact with each other.

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.

A liquid ejecting head configured to eject a liquid in a first direction includes: head units arranged side by side in a second direction orthogonal to the first direction and a flow channel member having a first supply flow channel through which the liquid is supplied to the head units, a first collection flow channel through which the liquid is collected from the head units, a first inlet portion through which the liquid is let into the first supply flow channel from the outside, and a first outlet portion through which the liquid is let out to the outside from the first collection flow channel. The first inlet portion and the first outlet portion are disposed near the center of the flow channel member in the second direction.