... we should pay our attention on controlling, avoid the Temp-sensor displacement, reflect on the temperature measuring. We should ... PCB board, check if it is ok. If not, re-operate.Suggestion:About the components without plumbum, ... the test when it is dry. If it is not ok, re-soldering it.(4)Around working, when ... a little larger than the slice of silicon, but not too large. Otherwise, it will do effect on ...