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Static noise in volume control

I have an NAD 7250 PE Receiver  It's about 19 years old. As I turn the volume knob I hear a static noise. It use to go away as the amp warmed up but it now continues even after an hour.  The noise comes and goes more coming than going at this point. I tried a spray into the volume knob area (pulled the knobs off) no effect. I have opened the outside case used air to clean the inside. Yes lots of dust etc.  I  don't see any easy way to get into the volume control unit.
Suggestions??

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  • Anonymous Mar 20, 2009

    I have the same problem. I think heat might be the cause of the problem?

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: klh model 52 audio receiver

Open the receiver and locate the potentiometer for the volume. There should be small openings in which you can spray electrical contact cleaner. The spray can be found at any electronic supply store (Radio Shack). Make sure the product says no or zero residue. I use a product called "Electrosolve". After spraying, immediately rotate the pot back and forth a few times. You may need to repeat this process two or three times. You might as well hit the other controls while you're at it. If several attempts don't eliminate the problem, the pot will need to be replaced.

Posted on Oct 11, 2007

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SOURCE: Speaker noise

The contacts on the volume control (potentiometer) get oxidized over time on any analog rotary volume control. With the power off, crank the volume control back and forth real fast for a minute or two, this will do the most cleaning of the contacts that you can do without access to the insides. Ultimately you'll probably need to sprary some tuner wash/tuner cleaner or other electronic parts cleaner in the know (with the electricity disconnected) and then work the knob back and forth. Tuner wash bottles are available at electronic specialty stores or radio shack and usually have a long extension tube (like what comes with WD40). You might be surprised where you can reach with the extension tube.

Posted on Sep 01, 2007

marsrover
  • 682 Answers

SOURCE: volume control problem

bring good contact luricat cleaner from near radio shack and apply it over volume and move it forward and backward many times.

Posted on Jul 05, 2008

  • 1 Answer

SOURCE: Pioneer Stero Receiver model SX-3700-

It sounds like your volume control pot has dust in it.You need to remove your cover from the receiver,spray pure denatured alcohol in the small openings in the back of you volume control dial and turn the knob all the way up and down several times and then blow low compressed air threw the same small openings while rotating your dial.That should fix your problem.Be sure you unplug your receiver before performing this procedure.

Posted on Feb 20, 2009

Monster80
  • 463 Answers

SOURCE: burst of static when turning on sherwood s7300 receiver

Hi there.Alot of times these old amps on there power board will have dust build up on them.Try this,Fully blow the amps on/off button and every other place you can get at..I hope this may work for you.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

Posted on Mar 31, 2009

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Volume switch on Panasonic radio has scratchy static sounds


Sounds like oxidized contacts.
If volume is a turn-knob, then wiper-track (inside potentiometer) is worn.
If it's a PTM (push-to-make) standard button, the button contacts may be dusty/dirty/oxidized.
Suggest you:
buy a contact cleaner such as Servisol,
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Move/press/wiggle scratchy one to help 'scrub' the contacts clean.
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Try shaking the volume knob while in the 30-50% range and/or try (with the power off) rotating the volume knob numerous times from 0% to 100%. If when you plug it back in it responds ANY differently, you might have a bad volume potentiometer. If when you shake the knob you hear static or intermittent sound, you have a bad volume pot.

The only other thing I can think of is that the wiper of the volume pot is not in contact with the windings inside the pot until you reach the 75% mark. When the volume comes on at 75%, does it start off kind of "static" then come in loud and clear? Also try this.... adjust the volume pot to 74% (or when the sound just begins to come on). At this point shake the knob. If you hear static, replace the volume pot.

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