Seiko Epson Corporation

Kohei Kumamoto

Yasuhiko Kosugi

Shuichi Nakano

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.

Printhead control circuit and liquid ejecting apparatus

A liquid supply apparatus includes a liquid storage container including a memory, a liquid feeding mechanism that feeds out liquid to the print head, and a second controller. A first liquid consumption amount is a consumption amount of liquid consumed in a non-printing operation in which liquid is not discharged from the print head to a recording medium, and a second liquid consumption amount is a consumption amount of liquid consumed in a printing operation in which liquid is discharged from the print head to the recording medium. The second controller calculates the second liquid consumption amount based on a liquid feeding amount of liquid fed out from the liquid feeding mechanism in a printing operation, stores the second liquid consumption amount in the memory, receives the first liquid consumption amount from the first controller, and stores the first liquid consumption amount in the memory.

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Shiojiri, Japan

Kohei Kumamoto