For complex boards or boards that aren't tested with an in-circuit tester, most companies perform a functionaltest before final assembly.
对于复杂的电路板或者没有经过在线测试的电路板而言,很多公司在最后装配之前进行功能测试。
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For simple assemblies, the number of boards with these problems is small, so many companies pass the boards on to final assembly without a functionaltest.