Liquid ejection apparatus

A liquid ejection apparatus comprising:

• a head in which a plurality of nozzles are open;
• a carriage mounting the head and configured to move the head in a scanning direction;
• a conveyor configured to convey a medium in a conveyance direction crossing the scanning direction;
• a signal generator configured to output a signal that is selected among a plurality of signals depending on whether or not the plurality of nozzles include an ejection defective nozzle which has defectiveness in ejecting of a liquid;
• a maintenance part configured to perform a maintenance operation for recovering the ejection defective nozzle;
• and
• a controller configured to execute:
• ejecting of the liquid toward the medium by an ejecting operation of performing an ejecting pass of causing the liquid to be ejected from the plurality of nozzles while moving the carriage in the scanning direction and a conveying operation of causing the conveyor to convey the medium;
• and
• before the ejecting operation,
• determining of whether or not the ejection defective nozzle is present among the plurality of nozzles, based on the signal from the signal generator, and
• in a case that the controller determines that the ejection defective nozzle is present among the plurality of nozzles, determining, based on a first time and a second time, of whether to perform a first ejecting operation after performing the maintenance operation, or to perform a second ejecting operation without performing the maintenance operation,
• wherein the first ejecting operation is the ejecting operation in which all the plurality of nozzles are used in the ejecting pass, and the first time is a time required for performing the ejecting of the liquid toward the medium by the first ejecting operation, and
• wherein the second ejecting operation is the ejecting operation in which only nozzles, included in the plurality of nozzles and different from the ejection defective nozzle, are used in the ejecting pass, and the second time is a time required for performing the ejecting of the liquid toward the medium by the second ejecting operation.