Liquid ejection device and defective nozzle determination method

A liquid ejection device comprising:

• a liquid ejection head that is configured to eject liquid filling a pressure chamber from a nozzle by causing a pressure fluctuation in the pressure chamber by driving a piezoelectric element and that has a plurality of nozzles;
• a carriage on which the liquid ejection head is mounted, the carriage alternately executing a first movement, which is a movement in a first direction, and a second movement, which is a movement in a second direction opposite to the first direction;
• and
• a control section configured to control the liquid ejection head and the carriage, wherein
• the control section
• is configured to execute for each of the plurality of nozzles a defective nozzle determination process of determining whether or not a nozzle is a defective nozzle based on vibration generated by applying, to the piezoelectric element, a drive signal having a specific waveform different from a drive signal applied to the piezoelectric element in order to eject liquid from the nozzle and
• is configured to apply the drive signal of the specific waveform in a deceleration and acceleration period that spans a first movement deceleration period, which is a period in the first movement until the carriage decelerates from a predetermined constant speed movement state and stops, and a second movement acceleration period, which is a period after the first movement deceleration period and is a period until the carriage accelerates from a stopped state, starts the second movement, and enters the constant speed movement state.