1.1.1 Drawing/smearing is a common defect in dispensing. The common causes are that the inner diameter of the glue nozzle is too small, the dispensing pressure is too high, the distance between the glue nozzle and the PCB is too large, the patch glue is expired or the quality is not good, and the patch glue The viscosity is too high, it cannot return to room temperature after being taken out of the refrigerator, the amount of glue dispensed is too large, etc.

1.1.2 Solution: Change the nozzle with a larger inner diameter; reduce the dispensing pressure; adjust the "stop" height; Put into production again; adjust the dispensing volume.