1.Positioning copper exposure -- This problem is relatively rare, and the generalreasons 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 itselfor the ink sticking during the exposure process of the film is not cleaned onthe film);
2.Non-positioned exposed copper
1)Expose garbage (no positioning);
2)Scratch welding;
3)Film adhesive oil;
Influenceof PCB copper leakage
Mainlyis the oxidation problem, generally in a short time will not have what theconsequences, a long time will rust hair green, rot away slowly.