vondy Posted December 6, 2009 Share Posted December 6, 2009 So my HK 430 has been going strong for over 2 years now. All of the sudden there is noise. It's a buzzing sort of noise that starts out whenever there is power and the selector is turned to whatever input is plugged in. For instance, if the Aux is plugged in and the volume is all the way to 0, the buz is there. If I turn the selector to, let's say... phono without the turntable plugged in, there is no noise. I have my Aux plugged into my Apple Airport streaming music from my mac. With the cables unplugged, there is no noise. When the cables are plugged into the 430 but not the airport, the noise is there. When I plug the cables into the Aiport, the noise gets worse and louder with the volume change. Same goes if I plug my Aux into the Blue Ray and pop in a CD. I've opened the 430 up and cleaned everything. Lubed the knobs with DeOxit and conditioned. Still no luck. Any ideas to fix or do I need to send her out for fixen? Thanks! Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted December 6, 2009 Share Posted December 6, 2009 Sounds like something in the tape/aux circuit "let go". Capacitor? I had a similar problem on an amp (Sansui AU-11000). It started one day for no reason, etc. Was easily repaired; a PIA because I had to ship it to a tech. Fortunately, you are in Dallas and probably have access to a good tech in the area. Quote Link to comment Share on other sites More sharing options...
djk Posted December 6, 2009 Share Posted December 6, 2009 "With the cables unplugged, there is no noise" Nothing wrong with the 430, you have a ground loop. http://www.edcorusa.com/Products/ShowProduct.aspx?ID=66 Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted December 6, 2009 Share Posted December 6, 2009 Djk: Had to re-read what he said!! Twice!!! (I'm getting old...[:S]). Could it possibly, however, be a ground loop/short problem associated with the amp that is not detectable until something is plugged into aux? Quote Link to comment Share on other sites More sharing options...
vondy Posted December 6, 2009 Author Share Posted December 6, 2009 Thanks for your replies. OK, now the noise is gone! Completely, I did nothing but wake us this morning and turn it on. Weird. Quote Link to comment Share on other sites More sharing options...
KdAgain Posted December 6, 2009 Share Posted December 6, 2009 Thanks for your replies. OK, now the noise is gone! Completely, I did nothing but wake us this morning and turn it on. Weird. GroomLake Area 51 sent some of his 'Associates' over to fix it! Rod Quote Link to comment Share on other sites More sharing options...
KdAgain Posted December 6, 2009 Share Posted December 6, 2009 Sorry for the double post. Does anyone know how to delete a post? Rod Quote Link to comment Share on other sites More sharing options...
djk Posted December 7, 2009 Share Posted December 7, 2009 "Could it possibly, however, be a ground loop/short problem associated with the amp that is not detectable until something is plugged into aux? " I'm more inclined to believe he has a problem with his 'Y1' capacitors in his computer switching power supply. They are supposed to be 'self healing' types, but a (momentary) pin-hole short could be a problem. I will never hook a computer to a piece of hi-fi without galvanic isolation (transformer). http://sound.westhost.com/articles/external-psu.htm#kil Quote Link to comment Share on other sites More sharing options...
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