Cambridge audio azur 640r Loud Hum.

errol8000 · 6th May 2011, 03:56 PM

Hi I just purchased this item cheap second hand, but as soon as switch on and touch the volume control it emits a load hum through the speakers has any one heard of this problem with this amp before? Or know what it might be? Thanks.

nightanole · 6th May 2011, 04:16 PM

If you touch the knob and it hums, i would ground the pot first.

Step-by-Step Assembly Guide

step 10.

errol8000 · 6th May 2011, 05:09 PM

Aren’t these pots digital?

Mooly · 6th May 2011, 05:19 PM

Obviously it shouldn't hum when touched... so I would look for damage such as cracked print possibly caused by being dropped etc.

nightanole · 6th May 2011, 06:22 PM

Quote:

Originally Posted by errol8000

Aren’t these pots digital?

Doesnt matter what the pot is, you could have said chassis, foot, handle, its metal and should be grounded. If you touch the metal bottom and no hum, attach the pieces of metal that do hum to the bottom of the chassis.

errol8000 · 6th May 2011, 07:28 PM

Could i have caused this just by taking the top off?

errol8000 · 6th May 2011, 07:48 PM

While I am trying to solve this, could it damage my speakers I don't really have a cheap pair to try it out on.

errol8000 · 6th May 2011, 09:00 PM

Maybe i should explain that as soon i change the volume it starts to hum loudly not just touch the volume nob which is made of plastic.

nightanole · 6th May 2011, 09:10 PM

Yes that entirely different...
Sorry its a dolby digital receiver, trouble shooting is above my head without a schematic and the unit.

Mooly · 7th May 2011, 06:13 AM

Quote:

Originally Posted by errol8000

Could i have caused this just by taking the top off?

By just taking the top of... no.
But did it all work before you did ?

Quote:

Originally Posted by errol8000

While I am trying to solve this, could it damage my speakers I don't really have a cheap pair to try it out on.

Without seeing and hearing first hand I would say yes, its possible.

Does it only hum while the volume is being altered... in other words once adjusted is it OK ?

6th May 2011, 03:56 PM	#1
errol8000 diyAudio Member Join Date: Jan 2011	Cambridge audio azur 640r Loud Hum. Hi I just purchased this item cheap second hand, but as soon as switch on and touch the volume control it emits a load hum through the speakers has any one heard of this problem with this amp before? Or know what it might be? Thanks.

6th May 2011, 05:19 PM	#4
Mooly diyAudio Member Join Date: Sep 2007	Obviously it shouldn't hum when touched... so I would look for damage such as cracked print possibly caused by being dropped etc. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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6th May 2011, 04:16 PM	#2
nightanole diyAudio Member Join Date: Feb 2009	If you touch the knob and it hums, i would ground the pot first. Step-by-Step Assembly Guide step 10.

6th May 2011, 05:09 PM	#3
errol8000 diyAudio Member Join Date: Jan 2011	Aren’t these pots digital?

6th May 2011, 07:28 PM	#6
errol8000 diyAudio Member Join Date: Jan 2011	Could i have caused this just by taking the top off?

6th May 2011, 07:48 PM	#7
errol8000 diyAudio Member Join Date: Jan 2011	While I am trying to solve this, could it damage my speakers I don't really have a cheap pair to try it out on.

6th May 2011, 09:00 PM	#8
errol8000 diyAudio Member Join Date: Jan 2011	Maybe i should explain that as soon i change the volume it starts to hum loudly not just touch the volume nob which is made of plastic.

6th May 2011, 09:10 PM	#9
nightanole diyAudio Member Join Date: Feb 2009	Yes that entirely different... Sorry its a dolby digital receiver, trouble shooting is above my head without a schematic and the unit.

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