Why does the gas stove ignition needle have no spark?

         The ignition system of the cooker has ignition needle, pulser, battery three parts, from below to overhaul. First, Check the battery for electricity, replace a new battery, try and then press the knob to hear the "snap snap" pulse ignition sound, but you just can't see the spark, it must be the ignition needle is broken. No "snap snap" sound, it may be the ignition needle connection contact is not good, check the connection connector to ensure the power; finally determine the first two points are no problem , that is  the pulser is not working, to see whether the connection between the pulse and the battery box is intact, if intact, that have to replace the new pulser