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An amplifier with static sound repaired. Model: Daynavox PA-DAAM-1121

By on March 17, 2014








An amplifier that produces static noise in the speakers is an easy problem to fix. This was an old amplifier and the repair was easy. Here is the story.

amplifier repair

This is the equalizer and the master volume controls.

amplifier repairing

As you can see, there are three MICS inputs and three AUX inputs.

amplifier repairings

I was not expecting to see this kind of inputs on this old amplifier. It has SD card and USP inputs.


This is the inside the amplifier and as you can see it is very simple to understand; the power source, the input stage and the output stages.


As you can see, this is a closer look on parts inside this amplifier.

I found a lot of cold soldering joints on this board but it was not the main cause of the static noise in the speakers.


In this article, I am just showing the parts of the amplifier. The cause of this static in this machine was the main buttons. Here is the answer to this easy problem.

When hooked up the amplifier to the speakers, the sound was fine but when I tried to adjust thesound level or touch any button on this machine, I could hear the static noise coming out. It took only some cleaning to fix this problem.

I have used the contact spray to clean the inside of the all the button on this amplifier. I did not have to take the board out. Lucky me, there was a tiny hole on every button so I used the cleaning contact nozzle to force the solution inside.


It took only a few minutes to clean all of the buttons. Of course after I spray the button, I turn the button knob back and forth to get rid of all the dust inside.

Usually when it is dusty, this dust conducts static noises to the speaker and the only way to fix it is by using the contact spray just like I did in this repair.

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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