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What are the common problems and solutions of lighted tact switches?

Release time：

2022-08-04 14:23

What are the common problems and solutions of lighted tact switches?

The touch switch is one of the most widely used electronic components in daily life, and its main function is to control the disconnection and connection of the power supply. However, there are also some problems in the use of small buttons such as touch switches. What are the common problems and solutions of lighted touch switches?

What are the common problems and solutions of lighted tact switches?

1. The touch switch button is highlighted

For touch switches in daily use, the problem of button pressing is often encountered. It is because the force of the operation button is too large or the button is pressed frequently, causing the button to be depressed, causing the film inside the switch to rupture and the metal shrapnel of the switch to lose elasticity. To fix this, remove the touch switch and replace it with a film.

2. The touch switch is in poor contact

(1) Most of the switches that come into contact with in daily use will be exposed to the air. In addition, when used in some wet weather, the metal shrapnel inside the switch is easily oxidized. After that, the contact will be greatly weakened, resulting in some problems such as poor contact of the touch switch. Then the way to deal with the poor contact of the switch is to disassemble the switch first, and then you will find some black spots on the metal shrapnel of the switch, which is the effect of internal oxidation. At this time, you can use a knife to scrape off the shrapnel or replace the metal shrapnel element of the switch. After processing is complete, glue can be attached to the metal dome of the switch, and then the switch can be assembled. This operation method can solve the problem of poor switch contact.

(2) For problems such as poor contact of the touch switch, after a long time of use, a certain amount of dust will accumulate inside the switch. If the dust accumulation is too large, it will also cause some phenomena such as poor contact when the switch is in use. The way to solve the problem of poor contact is to disassemble the switch first, and then clean the shrapnel inside the switch and the dust on the substrate. After all the dust is cleaned up, the switches can be installed in the original order.

3. Welding touch switch virtual welding

First, apply some solder paste between the pins of the switch. When all four pins are covered, add some solder to each corner T of the switch. You can hold the switch key with tweezers and solder it with a soldering iron. Therefore, this operation can greatly reduce the occurrence of problems such as virtual welding on switch welding. But it should be noted that when soldering, be sure to pay attention to whether there are sundries and other objects at each pin of the switch. If there is, it should be cleaned up to avoid the same problems such as virtual welding during welding.

What are the precautions for the use of lighted tact switches?

When using the touch switch, be careful not to let water droplets or water vapor penetrate the inside of the switch. Although the current touch switch is waterproof, the intrusion of some water vapor is still inevitable, because the touch switch relies on the internal metal shrapnel to contact the conductive part to complete the work, and when the metal shrapnel comes into contact with water vapor and other substances, it is easily oxidized , resulting in the failure of the conduction function of the switch or some short circuits. Therefore, water vapor should be avoided from entering the switch.

Tact switch with light

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