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What are the values you are setting as min- and max-angle? And are you setting them through dynamic reconfigure or in the launch file? Please provide some more information and the console output of the hokuyo_node.

Try setting them to some values slightly larger than the actual max-angles. Like -2.1 for min_angle and 2.1 for max_angle. If it is not too far off, the hokuyo_node should automatically set them to the maximum allowed values. (3 would be too much...)