The crystal pins are black, what should I do?

Aguilera

The crystal pins are black, what should I do? [Copy link]

The crystal pins are black because of improper storage and oxidation. We can see that there are some black spots on the metal surface. The black spots are the result of rust caused by the metal parts coming into contact with oxygen. We have to learn something about the storage methods of crystal oscillators. We must be aware of the losses that the oxidation of crystal pins will bring to our work. First of all, the crystal pins are oxidized, and the tin wire and solder paste cannot be soldered normally; in addition, the oxidation of the crystal pins can easily cause the crystal to stop oscillating, and the performance is poor, that is, a bad crystal. If the crystal pins in the inventory are oxidized in a small number, we can use the following methods to make them look brand new. 1. Use an eraser to gently wipe the blackened parts of the crystal pins until the black spots disappear, and then you can use them normally. 2. Try to wipe the black spots on the pins with alcohol cotton balls. 3. Use a small blade to slowly scrape off the black areas on the surface. It is best not to wait until the pins are oxidized before dealing with them. Wouldn't it be better to take protective measures in advance? Here are some simple and practical methods for protecting crystal oscillators: 1. For the storage of crystal oscillators, first of all, consider the humidity around them, take anti-squeezing measures, and place them in a dry and ventilated place to prevent moisture from affecting other electrical parameters. 2. Secondly, for fragile crystal oscillator devices, take anti-vibration measures. They should not be placed on high shelves. During use, the crystal oscillator should not be dropped. Generally speaking, a crystal oscillator that has dropped from a high altitude should not be used again. 3. During the crystal oscillator soldering process, the soldering temperature should not be too high, and the soldering time should not be too long to prevent the crystal from internal changes and instability. 4. When the crystal oscillator shell needs to be grounded, ensure that the shell and the pins are not accidentally connected to cause a short circuit, which will cause the crystal to stop oscillating. 5. Ensure that the solder points of the two pins are not connected, otherwise it will also cause the crystal to stop oscillating. 6. For crystal oscillators that need to be cut, pay attention to the influence of mechanical stress. 7. After soldering, clean it to prevent the insulation resistance from not meeting the requirements.

灞波儿奔

The crystal pins are black and oxidized, which can easily cause the crystal to stop oscillating and have poor performance, which is a bad crystal. I have never noticed this before, thank you for sharing.