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tuner has "noisy" tuning at bottom end of FM dial

Discussion in 'Electronic Repair' started by Scott Kelley, Feb 24, 2008.

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  1. Scott Kelley

    Scott Kelley Guest

    I have a Kenwood KT815 tuner - pretty decent 5 gang tuner... At the
    bottom end of the tuning dial it is very difficult to tune -
    inconsistant tuning, does not smoothly transition through the tuning
    range, but rather jumps around, then does not necessarily stay tuned
    in to that frequency well. These problems do not occur at the top end
    of the dial.

    I have cleaned the tuning capacitor on 3 different occassions using
    various methods, including compressed air, circuit board cleaner, and
    a combination of both. Every time I clean it, it works great for
    awhile, then goes back to acting badly again.

    Any thoughts about this? I suspect there have been previous posts on
    the issue, but I didn't find anything...

    Thx
    Scott Kelley
     
  2. Baron

    Baron Guest

    After you have cleaned it a spot of Vaseline on the wipers will keep it
    that way for a lot longer. I use an old ink refill syringe and needle.
    You have to give it a good squeeze but it puts lube right where you
    want it!
     
  3. jakdedert

    jakdedert Guest

    Hey Scott...

    Could the dial cord be binding? Also, advice above about the wiper is
    valid. It's a brass piece that wipes against the shaft to ensure good
    contact. Make sure no gunk's built up under there.

    jak

    jak
     
  4. Dave Platt

    Dave Platt Guest

    I have cleaned the tuning capacitor on 3 different occassions using
    Air, and typical circuit-board cleaners will remove dust, and a lot of
    surface contaminants. Neither will remove oxide from the contacts, or
    lubricate the contacts to prevent metal-to-metal galling.
    You can buy commercial "tuner clearer/lubricant" sprays, which I
    believe combine a cleaning solvent with a light petroleum oil that
    remains after the solvent evaporates and acts as a lubricant.

    I've also had good luck using some DeOxIt spray on the contact
    surfaces of air-variable capacitors, roller inductors, and the like.
    It does a decent job at cleaning and deoxidizing the contact surfaces,
    and provides some lubrication and protection for the surfaces. A
    noisy roller inductor I flushed-and-cleaned four or five years ago
    remains clean and noise-free today.
     
  5. The ground connections to the center shaft need cleaning - lubrication. They
    use a copper feeler at each section to make contact to the center shaft.
    Some Caig De-Oxit D-100L dripped in there and worked around should take care
    of it. Kind of hard to describe without a closeup picture though.

    Mark Z.
     
  6. Scott Kelley

    Scott Kelley Guest

    You guys seem to be dead on. I can readily duplicate the problem by
    putting just the slightest pressure on the ground contacts. I ordered
    some DeOxIt as you recommended. Thanks a bunch.
     
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