1, first you can see whether the surface of electronic components has been polished. Generally, there will be fine lines or trademarks of previous manufacturers on the surface of polished parts. Of course, some dealers will also paint a thin layer on the surface of the parts to cover it up, which looks very bright and basically has no plastic texture.

2. Secondly, look at the printing on electronic components. Nowadays, many electronic components are marked with lasers or printed with special chip printers. The handwriting is clear and inconspicuous, and it is not easy to erase. The refurbished handwriting has a "sawtooth" feeling because of the corrosion of the cleaning agent, or the printing is fuzzy, with different shades, which is easy to operate.

In addition, the latest electronic component manufacturing technology no longer uses screen printing or laser printing labels, but in order to reduce costs, many refurbished electronic components still use screen printing or laser printing labels, which needs your attention. The main method is to look at the overall coordination, handwriting and background, and the old and new degree of pins.

3. Looking at the pins, all the tin-plated pins that look relatively new must be refurbished goods. Most of the original electronic components should be "silver powder pins", which are dark in color but relatively uniform in color, with no oxidation marks or "flux" on the surface.

4. Check the production date and the label of the packaging factory. The label of genuine electronic components should be consistent with the production date, while the label of refurbished components is chaotic and the production time is different. In addition, although the front labels of refurbished components are consistent, the values look chaotic, or the production date does not match. Pay attention to counterfeit and shoddy electronic components.

5. Check the thickness edge, because the refurbished electronic components are generally polished deeply, and the overall thickness will be obviously thinner than the genuine components, but it is basically difficult to see if you don't check and touch them carefully. However, we can look at the front edge of the device. After all, plastic packaging devices must be "demoulded" after injection molding, so the edges and corners are round (angle R), but the size is not large. When grinding, it is easy to grind this fillet into a right angle. Once it is found that most parts are at right angles, it can basically be judged as polished goods.