Dongguan QiMao Electronics Co., Ltd.

1. Clean and bake the board to remove moisture and moisture. The dust, moisture and oil stains on the surface of the object to be coated must be removed first, so that it can fully exert its protective effect. Thorough cleaning ensures that corrosive residues are completely removed and that the conformal coating adheres well to the board surface. Baking conditions: 60°C, 10-20 minutes, it is better to apply while hot after taking it out of the oven.

Circuit board immersion gold board and circuit board gold-plated board are commonly used processes in the production of circuit boards today.With the higher and higher integration of IC, the more and denser IC pins are. The vertical tin spray process is difficult to blow the thin pads flat, which brings difficulties to the SMT placement; in addition, the standby life of the tin spray board is very short.

The protective film formed by the three-proof paint of the circuit board can effectively isolate the circuit board and protect the circuit from corrosion and damage in harsh environments, thereby improving the reliability of the circuit board, increasing its safety factor, and ensuring its service life.

This method consists of spring-loaded probes connected to each detection point on the board. The springs apply 100 - 200g of pressure to each probe to ensure good contact at each test point, and such probes are called a "bed of needles". Under the control of the testing software, the testing points and testing signals can be programmed, and the inspector can obtain the information of all testing points.

Gold powder: It has stable chemical properties and good electrical conductivity, but it is expensive and its use is limited to thick-film integrated circuits.Silver-based conductive ink: Used extensively for conductive printing of membrane switches. When the printing material is polyester, the silver powder can be dispersed into the polyester resin binder to make a paste conductive ink.

1. EPROM chips should not be damaged in general. Because this chip requires ultraviolet light to erase the program, it will not damage the program during testing. However, there is information: due to the material used to make the chip, with the passage of time (the age is long), it may be damaged even if it is not used (mainly refers to the program). So make backups as much as possible.