1. printing: check whether the periphery of solder joint is smooth, whether the effect of tin climbing is excellent, whether the drawing force of the welded part is satisfied, and whether the welded part is displaced; See if the solder paste is stable after repeated printing.
2. Glue dispensing: mainly check whether the glue is blocked, the amount of tin coated when dispensing, whether it is easy to delaminate, the firmness of solder joints, whether it is flying tin, etc.
The above information is provided by Suzhou Duma Technology (a school-run enterprise of Changzhou University).