How to do a test for skm9000 microphone?

1.You have 2 pcs handheld microphones, one is good, another one is bad. Like this:

2.One handheld microphone has 1 head and 1 body, we need to confirm which one has problem, the body or the head? So we need to do a test.

3.As you can see this photo, Here are good A1, good A2, bad A3 and bad A4.

4.Please connect good A1 to bad A4. If it can not work well, we can confirm the bad A4 has problem. At the same time, please connect bad A3 to good A2. If it can work well, we can confirm the problem is bad A4

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