Liquid discharge apparatus

A liquid discharge apparatus comprising:

• an installation case configured to receive a cartridge, the cartridge including:
• a first liquid chamber storing a liquid;
• a first flow path, one end of the first flow path communicated with the first liquid chamber, the other end of the first flow path communicated with the outside;
• a second flow path, one end of the second flow path communicated with the first liquid chamber, the other end of the second flow path communicated with the outside;
• and
• a cartridge memory;
• a tank including:
• a second liquid chamber;
• a third flow path, one end of the third flow path communicated with the outside, the other end of the third flow path communicated with the second liquid chamber, at least one of the first flow path and the third flow path configured to communicate with the first liquid chamber of the cartridge is installed in the installation case and the second liquid chamber;
• a fourth flow path, one end of the fourth flow path being below the other end of the third flow path and communicated with the second liquid chamber;
• and
• a fifth flow path, one end of the fifth flow path communicated with the second liquid chamber, the other end of the fifth flow path communicated with the outside;
• a head communicated with the other end of the fourth flow path;
• a notification device;
• an interface;
• and
• a controller,
• wherein at least one of the first flow path and the third flow path is configured to cause the first liquid chamber and the second liquid chamber to communicate with each other in a case where the cartridge is installed in the installation case, and
• wherein the controller is configured to:
• determine whether a position of a liquid level in the second liquid chamber is lower than a reference position;
• based on determining that the position of the liquid level in the second liquid chamber is lower than the reference position, control the notification device to perform a first notification;
• determine whether the cartridge is installed in the installation case;
• based on determining that the cartridge is installed in the installation case after controlling the notification device to perform the first notification, read out a liquid amount Vc from the cartridge memory via the interface, the liquid amount Vc indicating amount of liquid stored in the first liquid chamber;
• receive an image recording instruction to form an image by discharging the liquid through the head;
• determine a liquid amount Vs based on an outflow amount Qc and a discharge liquid amount, the liquid amount Vs indicating amount of liquid stored in the second liquid chamber, the outflow amount Qc indicating amount of the liquid to be flowed out from the first liquid chamber toward the second liquid chamber, the outflow amount Qc being determined based on the read liquid amount Vc, the discharge liquid amount indicating amount of liquid instructed to be discharged through the head performing image recording of unit recording area based on the received image recording instruction;
• determine whether the liquid amount Vs reaches a first threshold value;
• wait for a standby time T1 to perform image recording of unit recording area, the standby time T1 starting after it is determined that the liquid amount Vs has not reached the first threshold value and a condition occurs;
• determine whether the standby time T1 has expired;
• and
• based on determining that the standby time T1 has expired, perform image recording of unit recording area.