PCB (double-sided multi-layer printed circuit board) about the production principle of what?
shape processing (come up with finished product unit) -> electrical test (test line integrity) -> final inspection -> packaging
(Check the line integrity and other appearance problems) -> green oil (surface resistance welding protection) -> corrosion (remove the useless copper) -> check (check line integrity and other appearance problems) -> green oil ) -> surface treatment (welding surface treatment)
(Cut through the production unit) -> drilling (drilling through hole) -> copper (copper on the hole, the principle is the palladium ion) -> plate power (thickening table / hole copper thick) ->
