220v ac to 6v dc power adapter 1.CE,FCC,Rohs ... -circuit, no open circuit, no bad led indicator ,no high voltage, no low voltage, no output, etc 3.Assembly ... full inspection: to make sure every unit with power, no high voltage, no low voltage, no bad led indicator, low ... screw, no label misaligned, etc2 sampling inspection:IQC (incoming quality control): according to AQL-MIL-STD-105E level II standardOQC ...