Disconnection of circuit boards causes
First look at the form of disconnection, and then analyze what is in the process off, and then in the process of what causes. And then gradually investigation.
General disconnection problem mainly in the film process (because of paste is not strong, there are air bubbles, if it is wet film also waste pollution), the exposure process (the film as scratches or problems caused by garbage, including the problem of exposure, exposure, lack of local Etc.), development process (development is unclear), etching process (nozzle pressure, etching time is too long), electroplating problems (uneven plating, or surface adsorption), improper operation (basically due to scratch).
Key to see the form of broken, so the experience is very important to process engineers.
