A liquid ejecting system includes a head unit that includes a nozzle for ejecting a liquid, a pressure chamber communicating with the nozzle, and a drive element for applying pressure fluctuation to a liquid in the pressure chamber by supplying a drive pulse, a first connection portion that is communicably connected to a server through a network, a decision portion that decides a waveform of the drive pulse supplied to the drive element based on first input information, and a first input portion to which the first input information is input from the server through the first connection portion.

Provided is a liquid ejection apparatus capable of executing a kogation removal process at appropriate timing, thereby stably ejecting a liquid without shortening the lifespan of a head. For this purpose, the timing to execute the kogation removal operation of dissolving a metal in a protective layer through an electrochemical reaction with the liquid is determined based on information on an ejection characteristic of the liquid.

Provided is a technique capable of obtaining stable ejection characteristics. For this purpose, as a potential difference between an electrode 121 and a counter electrode 129 in an aging process, different potential differences Va are used for a brand-new liquid ejection head and a liquid ejection head having undergone a kogation removal operation.

Provided is a technique for achieving stable ejection characteristics. To this end, during liquid ejection, a potential difference Va is generated between an electrode and an opposing electrode, the potential difference Va being different between a liquid ejection head in a brand-new state and a liquid ejection head which has performed a kogation removal operation before.

Provides a technique that can suppress occurrence of the image unevenness and the like due to a burnt ink on a heater surface. To this end, between aging processing and printing processing, preprocessing is performed with a potential difference between a potential difference during aging processing and a potential difference during printing processing.

Disclosed are a maintenance method and a care method of a print head, a printer, and a printing apparatus. After printing completion, cleaning liquid may be controlled to be poured into a print head to clean the print head. After cleaning completion, less corrosive moisturizing liquid may be poured into the print head to keep the print head moist, which can reduce concern of blockage of the print head. This approach may reduce retention time of the ink in the print head. The less corrosive moisturizing liquid may be used to keep the print head moist and/or reduce possibility of the print head being corroded. Such approaches may maintain an operational performance of the print head.