Recording device and control method thereof

A control method of a recording device configured to perform recording on a recording medium using a liquid ejection head including a plurality of nozzles ejecting liquid;

• a plurality of heaters heating the liquid disposed corresponding to the plurality of nozzles respectively;
• a driving unit driving each of the plurality of heaters;
• and
• a plurality of temperature sensors disposed corresponding to the plurality of heaters respectively,
• the control method comprising:
• a step of consecutively applying a first drive signal and a second drive signal to a heater corresponding to a nozzle to be determined among the plurality of heaters by using the driving unit, heating of the heater in a case where the second drive signal is applied being different from heating of the heater in a case where the first drive signal is applied;
• a step of acquiring a first output, which is an output of a temperature sensor corresponding to the nozzle to be determined among the plurality of temperature sensors in a case where the first drive signal is applied;
• a step of acquiring a second output, which is an output of the temperature sensor corresponding to the nozzle to be determined among the plurality of temperature sensors in a case where the second drive signal is applied;
• and
• a step of determining whether the nozzle to be determined is in a state of normally ejecting the liquid based on a change rate of the first output and a change rate of the second output,
• wherein, during an interval between the first drive signal and the second drive signal applied for the determination, a drive signal is not applied to heaters corresponding to the nozzles other than the nozzle to be determined among the plurality of heaters.