[Kenwood] TS-850 Encoder Help Needed

[Dan Violette]

I am not a great electronics person and have been working on figuring a
problem with a TS-850.  Went to chemical engineering in school to keep this
a hobby and have enjoyed helping people fix things to do some learning.

History - Second radio that has not been on in a while.  I got it out to
change the memory battery.  Plugged it in, 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 (Digital Unit) and get the same indication.

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?  Appreciate it.

Dan, KI6X