basic lighting inside the tunnel

fiw493f1n · Wysłany: Wto 2:05, 01 Mar 2011 Temat postu: basic lighting inside the tunnel

with solder paste and reflow process production. Therefore, LED lights to bring the volume of solder joints with smooth and not many joints cylindrical arc from the FPC pad at the extension to the LED electrodes. The LED lights with cottage version of the volume of solder joints is uneven, mostly a dot wrap welding foot, while there will be varying degrees of tin tip appeared, which is a typical phenomenon of manual welding.
2, see FPC quality. FPC copper and rolled copper sub-deposited two, Bonded Copper of copper foil is projecting, and look with the FPC, then the connection from the pad at the seen. Copper is the calendar closely,LED writing board, and FPC as a single entity,vinyl banner, and can bend and will not appear any pad off phenomenon.
Bonded Copper will appear if the pad bending too much off, when the temperature is too high maintenance can also cause the pad off. 3, see LED lights with the surface cleanliness. If the use of SMT technology, the LED lights, its surface cleanliness is very good, do not see any impurities and dirt. However, if hand-welding technology, the cottage version of LED lights, no matter what the surface cleaning, and cleaning will be residual traces of the stain, while the surface of the FPC will be flux residue and solder residue.
4, look at packaging. Formal will use LED lights with paper trays anti-static packaging, usually 5 m or 10 m roll of a roll, and then using anti-static moisture outside the bag sealed. The cottage version of the LED light with because of cost savings,menu board, while the use of recycled paper trays, and then there is no proof anti-static bags, look carefully to see the appearance of paper trays with clear labels and scratch marks left behind. 5, see label. LED lights with regular paper trays bags and above will have a printed label,portable displays, not the printed labels.