For complex boards or boards that aren't tested with an in-circuit tester, most companies perform a functional test 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。

youdao

For simple assemblies, the number of boards with these problems is small, so many companies pass the boards on to final assembly without a functional test.

对于简单的装配而言，电路板虽然存在这样的问题，但是数量少，所以很多公司在最后的装配过程中没有对电路板进行功能测试。

youdao

A final aesthetic and functional test is performed before dispatch.

装运前，需对每一枚腕表作最后的外观和功能检验测试。

youdao