1. Positioning copper exposure -- This problem is relatively rare, and the general reasons are as follows:
1) No oil on the screen (oil plugging when the screen is not clean);
2) Expose garbage;
3) There are blip blocking spots on the film (due to problems with the film itself or the ink sticking during the exposure process of the film is not cleaned on the film);
2. Non-positioned exposed copper
1) Expose garbage (no positioning);
2) Scratch welding;
3) Film adhesive oil;
Influence of PCB copper leakage
Mainly is the oxidation problem, generally in a short time will not have what the consequences, a long time will rust hair green, rot away slowly.
