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Hello i have a yamaha cx-830 pre amp. the volume potentiometer was cracking a year ago and an authorized service tech told me to blow the dust out and lube it with detoxit. Witch corrected the problem. The unit hardly ever is used but now there seems to be no sound . The unit powere up and every switching feature appears to function correctly. I have turned the output levle all the way down on my cd player and bypassed the pre amp directly to the mx-830 via rca momentarily and the other components all function correctly. If the volume is turned up to absolute maximum there can be heard a slight amount of sound making its way through the pre out rcas to the power amp. Does any one know if the small volume potentiometer boards can fail or any where else it sounds like i should be looking? Thank you

Posted by Michael on

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Brad Brown

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  • RCA Master
  • 19,008 Answers

This is a component failure. A lot of pre amps use OPERATION AMP chips. Finding the issue involves a lot of time and troubleshooting with special equipment.

Posted on Apr 07, 2020

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Anonymous

  • 2 Answers

SOURCE: my old yamaha wont stop buzzing

HI SIR .THAT IS NOT BIG PROBLEM.ALL YOU HAVE TO DO MAKE SURE THAT YOUR PRE HAVE THE FLL.1 PROPERLLY EARTHED(THE GROUND FROM YOUR AMP ALSO GOES TO THE PRE )2 ASK YOUR ELECTRONIC MECHENIC TO CHECK IF THER'S NO BROKEN GROUND ON THE BOARD INSIDE.

Posted on Aug 23, 2008

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Anonymous

  • 8546 Answers

SOURCE: power amp outputs no sound

No one could determine the extent of the problem without placing hands and eyes on the unit.

Have you checked the Yellow Pages or online equivalent?

Posted on Mar 25, 2010

Anonymous

  • 1622 Answers

SOURCE: in need of a pre-amp

Hi, You will need to use another RCA monster cable to test where the buzz sound , if the buzz sound still comes on, that means the out put of the pre-amp needs to be replaced...

Take care..

Posted on Apr 17, 2011

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Yamaha PSR 740 Volume knob crackles when turned and the sound cuts out when played at higher volume
There is dust in the sliding mechanism, which can be cleaned with a good electronic cleaner, which does not evaporate when drying. If that does not work, replace the volume potentiometer, the `part behind the knob.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/robert_573a00ba7e399076

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Check this link to find a contact/conditioner cleaner or you can try spraying rubbing alcohol but this could because alcohol doesn't not lubricants properties.
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Yamaha 860 st
this could be the pre amp transistor or the power amp , it will need to be tested and other components tested also to make sure they are not causing the pre amp to fail or the power amp to fail
if its the pre amp it will be cheap , if its the power amp then it won't be cheap , other small components are cheap

electech
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My old yamaha wont stop buzzing
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