Liquid ejection apparatus and control method of liquid ejection apparatus

A control method of a liquid ejection apparatus that includes a liquid ejection head ejecting a liquid from a nozzle,

• a liquid storage portion having a first storage chamber and a second storage chamber, the liquid storage portion being configured to store the liquid supplied from a liquid supply source to the liquid ejection head,
• a first discharge flow path communicating with an upper portion of the first storage chamber,
• a second discharge flow path communicating with the upper portion of the second storage chamber,
• a carriage on which the liquid ejection head, the liquid storage portion, the first discharge flow path, and the second discharge flow path are mounted, the carriage being configured to reciprocate in a scanning direction,
• a coupling portion configured to be coupled to and separated from a coupled portion, the coupled portion communicating with the first discharge flow path and the second discharge flow path,
• a negative pressure generating section applying a negative pressure to the first discharge flow path and the second discharge flow path via the coupling portion,
• a first opening/closing portion configured to open and close the first discharge flow path,
• a second opening/closing portion configured to open and close the second discharge flow path, and
• a switching member configured to switch between a first state and a second state, the control method comprising:
• opening the first opening/closing portion by setting the switching member to the first state and moving the carriage, and discharging air bubbles from the first storage chamber;
• and
• opening the second opening/closing portion by setting the switching member to the second state and moving the carriage, and discharging air bubbles from the second storage chamber.