... of the electronic expansion valve ems and smt servicecircuit board PCBA for controlling the opening of the electronic ... and the bom.pcba assemblyprinted circuit board assemblysmd assembly service1,Printed circuit board assembly.2,The smallest aperture is ... accepted3,Bare PCB fabrication4,Component ptocurement5,Stock control and warehousing6,Quality control and test 7,Packing and dispatch8,Added ...