>From wormser Fri Jul 11 12:32 CDT 1997
From: Alan Wormser 
Message-Id: <199707111732.AA04480@osiris.cso.uiuc.edu>
Subject: Freq Jump - Fixed
To: G3SEK@ifwtech.demon.co.uk, n2ah@sprynet.com, pwentzel@minn.net,
	frankf1056@aol.com, w7us@flash.net, par@magg.net, kj5ag@cyberback.com,
	rtwodtwo@jps.net
Date: Fri, 11 Jul 1997 12:32:34 -0500 (CDT)
Cc: wormser (Alan Wormser)
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I had a problem with my TS-830S jumping frequency - about 100 Hz.at a time
and I got lots of replies when I aksed for help.  Ham radio is full of a
bunch of really great folks - no wonder I love this hobby!  For me,
cleaning the FIX button worked (yes, the "FIX" button was broken ;-) ).
I'm posting this to thank everyone, and to help anyone else in the same
situation.  All these suggestions were excellent.

>From Ian G3SEK, Art N2AH, Paul K0PW, Frank Kb0ZFN, and many others:

Grounding the AF/AVR board: Connecting a wire from TPG post to
ground screw, and inserting star washers between board and heat sink,
In accordance with Kenwood bulletin - appeared in QST Hints & Kinks 
in the mid-1980s.
..........
>From Bill Allen W7US 

Hi Alan,I had this problem with my 830 and found that the grounding
screws on the pc boards were not making good contact
..........
>From Dale R. Parfitt W4OP 

Although I have not seen this problem in a Kenwood, I have seen it in 
Icom and Yaesu- both with the same cause- small single turn variable 
caps. In case of the Yaesu it was a frequency netting cap on a 
heterodyne oscillator- drove me nuts. It occurred randomly and never 
when I had the rig open. A hint from another ham sent me looking in that 
direction. Replaced 2 or 3 and that was the end of it. Hope this helps.
........
>From Brian Sherrod KJ5AG 

Check the external VFO DIN jack in the rear.  Actually you will need to
check it from the inside.  If you have one, put the matching DIN plug into
the jack and pull it in and out several times.  

This is a common problem with the 830.  This jack has a contact which is
shorted WITHOUT a external VFO.  If the contacts get dirty, it will do
exactly as you described.  You might also want to spray a small amount of
contact/electronic solvent on the jack and do the plug in and out as I
mentioned before.
........
>From Dennis Clemenson NT0V 
NOTE: This solution is also in the 1997 edition of ARRL's book,
"Hints and Kinks"

I had what sounds like the same problem with a TS-830S.  Turned out the
switch labeled "FIX" was intermittent.  It is in the path of the voltage
to the VFO and if it has some extra resistance, the frequency would
change.  I tried "Deoxit" and that worked for a while but finally I
jumpered around the switch contact since I never used crystals for
operating.  Try operating the switch many times and see if goes away for
a while.
........
>From John  

Sounds like one of the xtal trimmer caps is going bad.   The center
pivot point is getting rusty.  Contact cleaner will fix this for
a month or so but you need a new one.