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Vivian
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pioneer home stereo system - 25 cd changer Loud static when turned on

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Whenever I turn on my stereo, it makes a loud ongoing static noise regardless of what mode it's in - radio, cd, record player. I checked the speakers and they are okay. What could be wrong?

Edited by: Sam Lionheart ( )

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John Ballard
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Loud crackling noises from audio equipment are often caused by connection problems on the input side or within the controls. Check and clean all plug-in connector with spray contact cleaner…. More of this stuff later. Also move the power lead about a little as sometimes a poor connection here can result this type of noise.

Screw type attachment terminal can also loosen so check them.

If your system has a combined on/off switch and mechanical volume control, this problem could well be dirt in and/or degradation of the volume control pot(potentiometer; it’s a variable resistor with a fancy name). Over time dust can get between the control’s track and wiper contact. If this is the case you will need a can of spray contact cleaner: Radio Shack will have it. You will need to take the covers off the unit to get to the control.

I guess you know this bit but I’ll say it anyway…… disconnect the mains power first. Try to spray the cleaner into the control: there are often openings in the metal case.

The tone controls are also subject to the same problems and the same remedy.

Hope this helps..

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Harley G
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It could be Ground loop hum, if a connection has become loose and is not grounded properly it can cause an annoying static. (this bit can be done plugged in, IF YOUR CAREFUL) If this is a component system then you'll have to disconnect everything and reconnect it one by one until you find the source of the hum and then (do this bit unplugged) check that piece of equipment for wear and tear that looks like it could be making an unnecessary ground (metal on metal connection). Usually this could be caused by the sheath on a cable being worn until the wire in connecting something else.

Good Luck :)

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