Liquid ejecting apparatus and maintenance method thereof

A maintenance method of a liquid ejecting apparatus which comprises:

• a liquid supply path coupled to a liquid ejection portion to supply a liquid stored in a liquid storage portion to the liquid ejection portion;
• a pump provided for the liquid supply path and configured to supply the liquid to the liquid ejection portion;
• a filter portion which is provided between the pump and the liquid ejection portion as a part of the liquid supply path and which includes a filter configured to allow the liquid to pass therethrough and a filter chamber defined by the filter into an upstream filter chamber and a downstream filter chamber;
• a return path coupled to the upstream filter chamber and the liquid storage portion and configured to discharge a liquid in the upstream filter chamber to the liquid storage portion;
• and
• a discharge valve located at the return path and configured to switch between a communication state in which the upstream filter chamber is in communication with the liquid storage portion and a non-communication state in which the upstream filter chamber is not in communication with the liquid storage portion, wherein
• while the pump is driven in the non-communication state, the non-communication state is switched to the communication state using the discharge valve.