When vibrations that may adversely affect the results of inspecting recording fluid discharge occur during the discharge inspection, properly discharging nozzles may be determined to be not functioning normally or faulty nozzles may be determined to be functioning normally. A vibration sensor is therefore used to detect vibrations in the inspection box during discharge inspection of a plurality of nozzles. Whether vibration adversely affecting inspection results was detected during the discharge inspection is then verified after discharge inspection is completed, and the cleaning process is applied to the faulty nozzles that need cleaning if such vibration was not detected. If such vibration was detected, the cleaning process is not executed and discharge inspection is repeated.