Follow the fabrication routeThe route starts with a controlled data release and ends with the agreed verification evidence. Exact operation order belongs to the qualified construction.Follow the fabrication routeA multilayer through-hole example; special constructions add or change operations01Release dataLock the revision andconstruction.02Pattern inner layersImage, etch and inspect.03LaminateBond the approved stack.04Drill and metallizeConnect the required spans.05Complete surfacesOuter circuit, mask andfinish.06Verify and releaseInspect, electrical test,record.³Ô¹Ïtv · Engineering explanation · Conceptual, not to scale