A Taxi driver and also a friend of mine called me from a land line and when I answered the phone, the sound coming from his phone was faint and hard to understand what he was saying.

As he brought the phone to me shop I knew exactly what to do because I was familiar with the problem and went right away to solving this issue.

The phone was charging fine and I could see that displayed on the phone screen. From experience, I headed directly to the source of the problem, which in this case the microphone circuit.

Two screws were off and I was able to see inside the phone. It looked nice and clean but that does not mean it was not faulty.

Usually I find cold joints there but in this case, re soldering the joints did not help. It was time to take the microphone off and replace it with another one

Taking the microphone off the board it is very easy but putting the replacement one back on is easy too but it requires some attention. By attention I mean, the microphone is very sensitive and it might be damaged if exposed to a lot of heat.

In other words, when putting the replacement microphone, use heat as low as possible and try not to keep the soldering iron touching the pins of the microphone for too long.

There are two sizes to these microphones but in this case it was the tiny one and they are hard to find. I usually buy phones that are faulty beyond repair or might me too expensive to repair; I take these microphones off board and keep them in my shop.

Once I installed the replacement microphone back on board and put everything together, I called the customer cell phone from his land line phone. When he answered; I asked him about if he can hear me well and he responded with a happy voice that it was loud and clean.

That was the testimony of the customer himself and that was music to my ear.

Mission Accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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Note: You can check his previous repair articles in the link below:

https://www.electronicsrepairfaq.com/a-wireless-microphone-dismantled-and-fixed-model-pdwm-2600