Reasons and Processing Methods for Non-spring-back of Slip of Light-touch Switch
Release time：2018-08-09 Clicks： Click
How should we handle the situation when the spring switch is not bouncing back? Details are listed below.
The recent response to some new customers, after the light touch switch welding of other companies, the key can not be relocated, according to our experience, it is mainly divided into the following aspects.
1. Touch the switch shrapnel itself without elasticity, in order to reduce the cost of using the shrapnel with hidden quality problems.
2, the welding temperature is too high.
2.1. The plug-in touch switch should not exceed 240 degrees Celsius/2 seconds or 235 degrees Celsius/5 seconds in the peak welding temperature.
2.2. The patch tap switch should not exceed 270 degrees Celsius/2 seconds or 260 degrees Celsius/5 seconds through reflow soldering.
2.3, manual welding soldering iron temperature should be controlled between 320-350 degrees Celsius, welding time should not exceed 2 seconds;
2.4. Manual immersion tin welding, welding temperature should not exceed 240 degrees Celsius /2 seconds;
2.5. The number of welding of the same touch switch should be controlled within 2 times.
2.6, all welding processes must be pre heated before welding. There is a slight difference in the preheating of different PCB sheets. Consult the PCB board manufacturer for details.
2.7, the above welding is only responsible for our products. There are differences in the light touch switches produced by different manufacturers. If you need to exceed the above time and temperature limit during the light touch switch of the welding, we suggest that you should contact us, and we will provide some suggestions for your reference.
3. The tactile switch is heavily squeezed in the course of transportation or under high temperature, resulting in the deformation of shrapnel. There will also be situations where keystrokes can not rebound.
4, when doing the high temperature test, the touch switch can not be out of conduction for a long time, otherwise there will be the situation that the key can not be rebounded due to the deformation of the shrapnel.