A inkjet printer has a mechanism to counter change in the tension of the recording medium to convey the recording medium with more precision. In a method, the position or movement of a movable member is detected by a detector, and the recording medium is conveyed based on output from the detector so that the movable member is maintained in or urged back to a set position. Also, one or more operations are stopped when the movable member moves outside of an allowable movement range. Which operation(s) is or are stopped depends on whether the movable member moves outside its allowable range in a direction that increases or decreases the tension in the recording medium.