[Kenwood] TS-850 Encoder Help Needed

[Dan Violette]

Sorry for asking again but maybe I hit the holiday weekend and Dayton period
and many missed my message.  I do appreciate the couple replies I got since
the obvious is a lot of times the problem.  I did try reseting and verifying
no problem with the battery.  I also had another say they had the same
problem without an answer for it.

> History - Second radio that has not been on in a while.  I got it out to
> change the memory battery as a preventive measure.  Plugged it in
> beforehand, heard sound, spun the dial and the display flickered, etc. and
> seemed fine.  Changed the battery to a socket and battery.  No leaking or
> corrosion seen and took the digital unit board out and took to my work in
> a static bag to work on it on a static safe bench.
> 
> Current Status - So I plug it in and spinning the tuning knob only
> flickers the display and does not change it (or it moves a little up or
> down in freq).  Probably did that during the initial test, just didn't
> look for that, but not sure.
> 
> What I have done - 
> 
> Put my good TS-850 next to it and plugged its encoder into it, still same
> problem (deduce not the encoder).
> 
> Turn the VFO Ch. and RIT/XIT and tunes fine (hooked to antenna too to
> verify fine operation).
> 
> Checked pin 2 and 3 of CN3 (encoder connector) and spin dial either way
> and digital voltmeter reads around 2.5v (average of 0 to 5).  When stop
> spinning goes to 0v or 5v depending on which pin you are looking at and
> which direction you spun the dial.
> 
> Checked at pin 4 and 5 of IC14 (on Digital Unit) and get the same voltage
> indications.
> 
> So, what I see is that the main encoder and the "click" encoder feed into
> IC14 OK, but only "click" encoder leaves the IC properly on the same data
> line they seem to share.  I don't know where the RIT/XIT go to change the
> freq.
> 
> Any words of wisdom?  I am not a electronics specialist and have a poor
> array of test equipment.  Appreciate any help.
> 
> Dan, KI6X