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Solutions to Four Common Questions on Touching Switches

Release time:2019-01-04    Clicks: Click

 
Some problems will be encountered when using the light touch switch. Some common problems will be introduced in detail.
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Touch switches are widely used, such as mobile phones, telephones, building equipment, PDA, treadmills, massage chairs, MP3, MP4, DVD, digital cameras, and so on. When the light touch switch is used in these products, occasionally some problems will arise. This article summarizes some problems that we often encounter when the light touch switch is applied to the products. The specific contents are as follows:
Problem 1. Soldering problems, cold soldering, pinhole, short circuit, less tin, more tin, tin hole
Problem 2: Electrical performance, flux will run into the light touch switch phenomenon. For example, capillary phenomenon is that water will rise along with small cracks in paper, sand, towels, soil and brushes, which is called capillary phenomenon.
Question 3. When solder joints solidify, they are subjected to improper vibration {such as belt vibration}. Welding material {foot, pad} oxidation; PCB water vapor parts. The foot of the thread is contaminated {e.g. silicone oil}. The air in the inverted through hole is blocked by the parts and is not easy to escape. The height of tin plate is too high, the oxide of tin wave surface is too much, and the distance between parts is too close. The wet tin is too high, the angle is too big, the flux proportion is too high or too low, the back baffle is too low, the pad {too large} is not matched with the line diameter properly, and the pad is too adjacent to each other to produce tin drawing. The preheating temperature is insufficient and Flux is not fully activated and cleaned. Flux is too low. Poor solderability of soldering pad for parts or PCB. The matching ratio of stitches and apertures is too large. The inner wall of the through hole is polluted or the wire foot is not completely tinned.
Question 4. It is suggested that customers should pay attention to the temperature control of light touch switch in a certain period of time when using it.
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