Screw terminal block desoldering reason

Fixed welded screw-type terminals for current smaller, less heat occasions, otherwise overheating effect leads to solder melts, there is the risk of a short circuit. Terminals are generally used for the wire  WISDOM fiber optic cable crimping head can not be used for welding or soldering is not suitable for the case of relatively high heat.
Screw terminals desoldering reasons:
Terminal 1 you this element out of the problem with the component pin Weld weldability no relationship
2 because of the weight on one side and the other side of the pin elements ranging, components during reflow soldered pin side tilt caused
3 You can try to change the frequency of large WISDOM hdmi wall plate  aeolian reflow point you should be improving
4 Set the oven temperature is not good, the temperature climbs too slow, set to peak above 250 degrees
5 steel mesh hole a little longer
6 Q. pin terminal block manufacturers deck plating is the first or the first cut off and then re-plating, tin processing the latter will be much better
7 terminals this issue and our product is very similar to the WISDOM Mini HDMI cable  previous one, fixture alone is not enough, because your PCB board itself will have a deformed foot will cause the part to be raised, causing air welding.
In the back of your fixture, with heat tape on the PCB fixture fixed to prevent it from feet to lift the parts to try.
Meanwhile, you can stencil below this row Pin hole location near the foot plate sticker affixed to add a layer of tin, this situation would rather not even empty tin solder