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Scratching noise on volume button

Discussion in 'Troubleshooting and Repair' started by mikehende, Dec 12, 2017.

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  1. mikehende

    mikehende

    65
    0
    Dec 22, 2006
    Hello all, I have 2 pieces of audio equipment with the very same symptoms [Numark Preamp and Digitech RDS 8000 Digital Delay], when I turn the volume knob the music cuts off and on with scratching noise, once I leave it alone the music plays fine no matter at which point the volume is, anything I can do myself to correct this problem please?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,662
    2,697
    Nov 17, 2011
    The scratching is caused by the wiper of the potentiometer literally scratching across the surface of the resistive element.
    Option 1: replace the potentiometer by a new one.
    Option 2: clean the old potentiometer with contact spray.
     
  3. mikehende

    mikehende

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    Dec 22, 2006
    Searching the net I found this video here:



    where the guy is using Radio Shack Control Cleaner and lubricant:

    https://www.radioshack.com/products/...BoCA-IQAvD_BwE

    What I would like to know is since isn't a radio shack store near me anymore, what else can I use to clean and lubricate the Potentiometer please which I might find locally?
     
  4. mikehende

    mikehende

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    Dec 22, 2006
  5. Harald Kapp

    Harald Kapp Moderator Moderator

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    2,697
    Nov 17, 2011
    The description states:
    • Ideal for telephones, PCs, relays, edge connectors, tape heads, buss bars, circuits, contacts, printed circuit boards, switches and circuit breakers
    • Safe to use on most plastics
    Sounds good to me, but I do not have experience with this cleaner.
     
  6. mikehende

    mikehende

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    Dec 22, 2006
    Hmnn, might as well order the Radio Shack one online and wait for it.
     
  7. mikehende

    mikehende

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    Dec 22, 2006
    Well, I am not sure with this, if you can look at the attached pic please, seems to me the Output Level's knob Potentiometer is possibly soldered onto the circuit board so won't be able to use the spray? Also, I can't tell for sure if that is a hole where the red arrow is pointing? Only way to know for sure would be if I could turn it somehow.

    https://s7.postimg.org/hdgc8qm2j/digi3.png
     
  8. Bluejets

    Bluejets

    4,991
    1,048
    Oct 5, 2014
    CRC, WD40, both have similar cleaning/ lubricating ability. One I used comes with a long thin tube that plugs into the nozzle allowing the lube to be directed into precise locations such as the slot adacent to the terminals on potentiometers.
     
    davenn likes this.
  9. Harald Kapp

    Harald Kapp Moderator Moderator

    11,662
    2,697
    Nov 17, 2011
    You may have to remove (de-solder) the pot for cleaning.
     
  10. mikehende

    mikehende

    65
    0
    Dec 22, 2006
    Ok I will try the CRC thanks.
     
  11. hevans1944

    hevans1944 Hop - AC8NS

    4,615
    2,154
    Jun 21, 2012
    Often, if you temporarily remove the knob, you can spray cleaner/lubricant into the potentiometer by directing the spray at the base of the shaft, where it enters the body of the potentiometer. Do this sparingly to avoid a mess, and test immediately after spraying by rotating the shaft back and forth.
     
  12. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    WD40 isn't really a lubricant but I use Vaseline (petroleum jelly) successfully as it is grease-like and gives the control a lovely smooth motion after application.

    There is usually a gap between the body of the potentiometer and the material the track is mounted on (where the three pins exit the body) where lubricant/cleaner can be applied. I've managed to 'smear' a dollop across/in the gap and moving the mechanism does the rest.
     
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