Inkjet recording apparatus capable of initialize ink quantity information based on quantity of ink injected into ink chamber

An inkjet recording apparatus comprising:

• a tank having a set of an ink chamber and an inlet, the ink chamber being configured to store ink therein, ink being injected into the ink chamber through the inlet;
• a recording head configured to eject the ink stored in the ink chamber to record an image on a sheet;
• a memory configured to store an ink quantity information, the ink quantity information including:
• a first threshold value;
• and
• a count value updated in a direction approaching the first threshold value to decrease a first difference between the first threshold value and the count value in accordance with ejection of the ink from the recording head, the first difference being obtained by subtracting one of the first threshold value and the count value from the other of the first threshold value and the count value, the first difference corresponding to a quantity of the ink stored in the ink chamber and being variable within a prescribed range;
• a display configured to display a screen;
• an operation interface configured to receive a user operation;
• and
• a controller configured to control the recording head and the display, the controller being configured to:
• perform an inference process to infer whether ink has been injected into the ink chamber through the inlet;
• perform, in response to the inference that ink has been injected into the ink chamber in the inference process, an inquiry process to display an inquiry screen on the display and to receive one of a plurality of operations through the operation interface, the plurality of operations including a first operation and a second operation, the inquiry screen inquiring whether ink has been injected into the ink chamber up to a maximum storage quantity thereof;
• perform, in response to the receipt of the first operation in the inquiry process, a first initialization process to set the ink quantity information to a first initial value with which the first difference becomes maximum within the prescribed range;
• and
• perform, in response to the receipt of the second operation in the inquiry process, a second initialization process to set the ink quantity information to a second initial value with which the first difference is smaller than the first difference with the first initial value.