Tactile switch common problem analysis

A problem, it is recommended that customers pay attention to the use of the touch switch temperature control in a certain period of time;

Second, touch the switch of the solder problem, there cold welding, pinhole, short circuit, tin less, more tin, tin hole;

Third, the electrical properties, flux will appear ran to touch the switch inside the phenomenon. Such as the capillary phenomenon, that is, water will be paper, sand, towels, soil, brush in the small gap will rise, so called capillary phenomenon;

Question four, solidification welding, by improper vibration {such as conveyor belt vibration}. Welding {wire foot, pad} oxidation; PCB with water vapor parts. Contaminated wire {such as silicone oil}.

Tactile switch air through the hole obstruction by the part, not easy to escape. Plates to eat high tin height, tin wave surface oxide too much, parts spacing too close. Tin wet too high, when the furnace angle, flux proportion is too high or too low, the tailgate is too low, the pad {too large} with the wire diameter is not appropriate, too close to the pad, resulting in tin. Pre-heating temperature is insufficient, Flux does not fully achieve the role of activation and cleaning. Flux low proportion. Bad solder on part or PCB. Foot and aperture ratio is too large. The inner wall of the via hole is contaminated or tinning is incomplete.