PCB line circuit boards and FPB problems
1, lines appear dry or wet processed corrosion occurred in the etched lines, pitting, resulting in line is not wide enough, or uneven line. The reason and the wrong choice of wet and dry material, exposure parameters properly, poor machine performance. Developing, etching nozzle adjustment, parameter adjustment is unreasonable, inappropriate drug concentration range, transmission speed series may result in problems such as improper reason. However, we often find that after checking the above parameters and related equipment performance, and there is no exception, but do still occur when the Board circuit board etching, pitting, and so on.
2, and in do PCB graphics plating, PCB, and FPC Terminal surface processing as sank gold, electric gold, electric Tin, of Tin, process processing Shi, we regular found do out of Board in wet and dry film edge or resistance welding layer edge appeared infiltration plating of phenomenon, or most Board appeared, or part place appeared, regardless of is which a situation will brings not necessary of scrap or bad for Hou section processing brings not necessary of trouble, and eventually scrap, was heartache! Analysis of the reason we often think is wet membrane parameters, material performance problem; solder mask ink for hard, soft boards covering issues, or printing, lamination and curing section there is a problem. Indeed, everywhere in these places can cause this problem to occur. So we are also puzzled by check section of the steps above did not question or problem solved, but still the phenomenon of diffusion.
Layers of circuit board identification techniques
Copper foil is covered in the whole circuit board and part of the production process to be etched away, PCB substrate itself is insulated, and difficult to bend the material produced by. Surface material is a small line of copper foil. Stay turned into a mesh of tiny lines these lines are called wire or wiring to provide parts of the circuit on the circuit board. Circuit Board of color is usually Brown or green, the color of the paint is solder. Insulating protective layer, thus preserving the copper wire, can also prevent the parts being welded to the wrong place.
Circuit board largely wiring area can be added. Multilayer PCB used more single-or double-sided wiring boards on both the video card and the motherboard is now plywood. And in between each layer in a layer of insulating layer lamination. Layers of the circuit board on behalf of the independent wiring layers, layers are usually even-numbered, and includes the two layers on the outside, rare circuit board is a 48-story structure. Many layers of the circuit board you can watch section of the circuit board to look out for. But in fact, no one can have such a good eye. So, teach you one of the following methods.
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