That is, the maximum offset between the center of the component and the center line of the corresponding pad, not more than 1/3 of the width of the component solder foot (visual inspection); or the incidence of abnormal offset is not greater than 3‰.
Instruments and meters are in good appearance, accurate indication, eye-catching readings, and within the qualified use period;
Regular maintenance inside and outside the equipment, keep clean, no oil, no rust, around the attached with parts in order, equipment lubrication is good.