PLC Programming Control Selectable Pitch Setting NG OK PCB Unloader Used After AOI SPI For SMT Production Line Product Introduction The SMT Line PCB NG OK Unloader is a professional automatic PCB sorting and unloading equipment customized for standard SMT production lines. Designed to connect seamlessly with AOI, SPI and other post-inspection equipment, this PCB NG OK Unloader automatically receives detection signals and classifies OK qualified PCBs and NG defective PCBs for