Liquid discharge apparatus and cleaning method that remove an adhered substance from an electrode in first and second operations

A liquid discharge apparatus comprising:

• a liquid chamber that has a discharge orifice for a liquid;
• a liquid discharge unit including:
• a heat-generating resistor for imparting discharge energy to a liquid in the liquid chamber;
• a first electrode that is provided in the liquid chamber so as to cover the heat-generating resistor;
• and
• a second electrode that is provided at a different position from the first electrode in the liquid chamber;
• a first voltage application unit capable of applying a voltage to the heat-generating resistor;
• a second voltage application unit capable of applying a voltage between the first electrode and the second electrode;
• and
• a control portion that controls the first voltage application unit and the second voltage application unit,
• wherein the control portion performs, as operations to remove an adhered substance on the first electrode,
• a first operation that is a voltage application by the second voltage application unit between the first electrode and the second electrode, in which a first voltage application where the first electrode is an anode and a second voltage application where the first electrode is a cathode are alternatingly repeated, in order to partially dislodge the adhered substance, and
• a second operation that is a voltage application by the first voltage application unit to the heat-generating resistor, the second operation being an operation for separating the adhered substance from the first electrode by applying a discharge energy thereto, in order to remove the adhered substance.