One thing is having good contacts but the other way is what I should measure on the output.
What voltage should I measure on the output. Must I use an oscilloscope or just DMM? Must I use an amplifier?
- That is what you should have asked in the first place.
- Second, be specific. Tell what kind of microphone are you talking about, and what is the problem. If you don't know the exact model of the microphone, then at least put a picture of it, or tell where from is that mic.
If it's what I think it is ,but my mind reading ability are not so good sometimes
, then a DMM on diode measuring setting might be enough. Be careful, microphones have a + and a -. Don't power them in reverse.