Let's take a look at the quality inspection standards of Normal PCB.
1.Serious faults (expressed in CR): any defects that can cause harm to human body or machine or endanger life safety, such as safety regulation, fire / electric shock etc.
2.The main shortcomings (expressed in MA): may cause product damage, dysfunction or due to material defects affecting the service life of the product.
3.Minor defects (expressed in MI): It does not affect the product function and service life, a number of defects in appearance and minor defects or differences in mechanism assembly.
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