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QSC CX702 Loud Humming

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micky7850 View Drop Down
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    Posted: 24 December 2016 at 1:06pm
Hi All,
         I have just aquired a CX 702 power amp. Bought it cheap, It has a loud humming on both channels,when connected to speakers. The humming is a continuous volume regardless of gain settings
 on amp.  I have not had time as yet to connect up mixer.  ANY IDEAS.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonp1100 Quote  Post ReplyReply Direct Link To This Post Posted: 24 December 2016 at 1:07pm
Sounds like the one off of Ebay. Wink
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micky7850 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote micky7850 Quote  Post ReplyReply Direct Link To This Post Posted: 24 December 2016 at 2:20pm
Hi, Yes just got to find the problem
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vertx View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 24 December 2016 at 8:49pm
I've had a loose/unsecure AC cable/plug connection do that, one of the 3, maybe the earth? was loose in the back of the plug.
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micky7850 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote micky7850 Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2016 at 1:16am
Will check It out.  Thanks.  I think it is probably on the power supply, as its affecting both channels.
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Pinyorouk View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pinyorouk Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2016 at 3:27am
Originally posted by micky7850 micky7850 wrote:

Will check It out.  Thanks.  I think it is probably on the power supply, as its affecting both channels.

Deffective power suppy capacitor?
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micky7850 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote micky7850 Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2016 at 9:52am
Hi Thanks for that, I have schematic and will check that, as its christmas i have put it on hold at the moment. Will put mixer through it and check for any distortion ect.  Merry Xmas  Mick.
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micky7850 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote micky7850 Quote  Post ReplyReply Direct Link To This Post Posted: 10 January 2017 at 12:49pm
Hi All  I put signal through mixer  still humming at all volumes. The humming is same volume whatever gain is applied.  Both Channels  are working ok with no distortion. Just the constant loud hum.
Micky
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