1. Welding quality: Check the quality of solder joints, including pads, solder paste and capillary. Welding shall be uniform and smooth, without welding defects (such as cold welding, virtual welding, welding skin, etc.). ).
2. Installation of components: check whether the installation position and direction of components are correct, whether the spacing between components is consistent, and whether there are problems such as dislocation or inclination.
3. Pad Covering: Check whether the pad is completely covered with solder paste, and whether the gap between the pad and solder paste is too large or too small.
4. Mat flatness: Check the flatness of the mat to see if there is any sag, bulge or deformation.
5. Pin spacing: Check whether the pin spacing is consistent and whether there are problems such as bending, dislocation and short circuit.
6. Cleanliness: Check the surface of PCBA for dust, stains, oil stains or other impurities.
7. Signs and logos: Check whether the signs and logos on PCBA are clearly visible and consistent with the design documents.