The following points we should pay attention to in soldering PCB:

1)The soldering temperature and environment;

2)The soldering method, such as if the PCB has components in both sides( In order to avoid components falling, pads rub off and board broken.)

3)Component soldering order:Resistor-Capacitor-Diode-Triode-Integrated Circuit-High Power Valve( From small size to big one)

4)Soldering way: Based on the sign direction shown for those polarity and direction components;

5)Appropriate tin usage( in order to avoid cold solder or short circuit);

6)Checking the welding point with the magnifier;