SMT inspection equipment mainly has AOI and SPI. AOI, also known as automated optical inspection equipment, is a device that detects common defects encountered in welding production based on optical principles. When it is automatically detected, the machine automatically scans the PCB through the camera, collects images, and compares the solder joints tested with the qualified parameters in the database. After image processing, the defects on the PCB are checked, and the defects are displayed/marked through the display or automatic signs. Come out for repair by maintenance staff.