[Yaesu] FT-1000D concentric knob sticking

[Jim Hargrave]

Chris,

Might I suggest you spray a little "TRI-Flow" on the shaft. It is an
excellent penetrant and contains Teflon for lubrication. It does not gum up
like regular oil.

WD-40 works, but I don't recommend it because it becomes gummy in time.
Machine oil will also eventually gum up. Whale oil is an excellent
substitute for light machine oil because it does not Gum up. Whale oil is
used in 8-day and other wind-up mechanical clocks, like grandfather clocks.

   * 73's Jim W5IFP *


   >-----Original Message-----
   >From: yaesu-bounces at mailman.qth.net
   >[mailto:yaesu-bounces at mailman.qth.net]On Behalf Of Chris Codella, W2PA
   >Sent: Friday, May 15, 2009 6:34 PM
   >To: YAESU List
   >Subject: [Yaesu] FT-1000D concentric knob sticking
   >
   >
   >A solution for anyone else having this problem:
   >
   >My FT-1000D is 17 years old and still performing well.  But in the last
   >three years or so I've noticed an increasing tendency for the
   >concentric
   >controls on the left side (e.g. AF/RF gain, MIC/RF Power) to become
   >coupled - that is, when you rotate the center, the collar rotates a
   >little bit too, and vice versa.  Depending on the severity of the
   >problem it can be quite annoying.
   >
   >Upon removing the inner knobs, I discovered that the problem
   >was not due
   >to interaction of the knobs themselves, but rather the shafts of the
   >concentric potentiometers.  There apparently is a lubricating material
   >between the inner shaft and the outer tubular shaft that, over time,
   >gets thicker resulting in a greater viscosity and therefore tending to
   >make the two shafts move together.
   >
   >The solution I found was to use light machine oil, such as the
   >stuff you
   >can buy for sewing machines, to loosen up the inter-shaft lubrication
   >again.  I applied a drop or two at the end of a screwdriver to the end
   >of the control where the inner shaft goes into the outer one.
   >I removed
   >only the inner (black) knob to do this.  I would rotate the inner knob
   >fully counterclockwise and the outer fully clockwise, apply a drop or
   >two, then rotate them fully in the opposite direction and apply another
   >drop or two.  After working it in for a while, going back and
   >forth with
   >the knobs, the lubricant worked its way in and solved the problem  Now
   >all of these controls work as new again, with no more co-rotation.
   >
   >73,
   >Chris, W2PA
   >www.w2pa.com
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