Abnormality determination method for liquid ejecting head, and liquid ejecting apparatus

A liquid ejecting apparatus comprising:

• a liquid ejecting head;
• a determination portion that is configured to determine whether or not the liquid ejecting head has an abnormality;
• and
• a control portion that is configured to control the liquid ejecting head and the determination portion, wherein
• the liquid ejecting head includes
• a plurality of ejecting portions including at least a first ejecting portion and a second ejecting portion, each of the plurality of ejecting portions including a nozzle that ejects a liquid, a pressure chamber that communicates with the nozzle, a first electrode, a second electrode, a piezoelectric body that is disposed between the first electrode and the second electrode and is driven to apply a pressure fluctuation to the liquid in the pressure chamber, and an individual flow path, and
• a liquid storage portion that stores liquid and communicates with the pressure chamber of each of the plurality of ejecting portions via the respective individual flow path,
• the control portion is configured to control the liquid ejecting head to
• hold, in a first period, a constant voltage between the first electrode and the second electrode of the first ejecting portion,
• supply, in the first period, a drive signal including a drive pulse to one of the first electrode and the second electrode of the first ejecting portion, to thereby apply a pressure fluctuation to the liquid in the pressure chamber of the second ejecting portion, and
• detect, in a second period following the first period, a residual vibration resulting from the pressure change in the liquid in the pressure chamber of the second ejecting portion, the residual vibration occurring within the liquid of the pressure chamber of the first ejecting portion after vibration from the pressure change propagates from the pressure chamber of the second ejecting portion, through the individual flow path of the second ejecting portion, through the liquid storage portion, through the individual flow path of the first ejecting portion, and into the pressure chamber of the first ejecting portion, and
• the determination portion
• determines whether or not the liquid ejecting head has an abnormality based on the residual vibration.