[Kenwood] TS950SDX Lithium Battery Replacement !

[w7aj at charter.net]

Dear Goran:
Below is a copy of what I experienced recently.  The problem was not the battery, but the voltage out of the VCO2 unit.  The low voltage caused by the voltage adjust trimmer was the reason the synthesizer unlocked (hence the "UL" cw trouble message.)
Go the web page in the body of the below message and find the problem discussed along with my reply.
Hope this helps...
73
Mike W7AJ





 I have lost the frequency display on my 950.  Turning the dial will 

 cause the display to return for about one second then the cw coded 

 message "UL" is sent and the frequency display goes out again.  I 

 assume that the "UL" means the frequency synthesizer is "unlocked".

 Any ideas where to start my search?

 Resetting the microprocessor does not help.



 Thanks

 Mike W7AJ

     

 

 *Hi Mike..

> > Check out  Jeff King's site at   

> > http://homepages.ihug.co.nz/~jaking/TS-950sdx.htm

> >  Jeff has done a great job of collecting all sorts of useful info for 

> > SDX users.

> >   Scroll down his page to "VCO2 Problems" This one seems the most likely 

> > cause of your problem.

> > Vy 73

> >     John EI7BA  http://www.iol.ie/~bravo/*

>   

 

 

 

-----Original Message-----
From: kenwood-bounces at mailman.qth.net [mailto:kenwood-bounces at mailman.qth.net] On Behalf Of w7aj at charter.net
Sent: Saturday, 6 May 2006 3:59 a.m.
To: kenwood at mailman.qth.net
Subject: Re: [Kenwood] TS 950SD

 

I'm pleased to say that with the help I received regarding my 950 problem, the reference to the VCO 2 probelm was also  my problem.  The test point 2 next to the VCO2 was reading about 0.680 volts.  By turning the trimmer several times to remove any oxidation, the 950 came back to life.  I set the voltage to 5.0 vdc and all appears to be okay again.

This is the only problem in about sixteen years of ownership.  One exception to that however was three pot. connections in the auto tuner that had never been soldered at the factory.

Thanks for the help!

Mike W7AJ




---- Goran Arezina <t98g at teol.net> wrote: 
> Hello to Everybody,
> 
> I saw some articles about TS850S Battery Replacement (got them on the HARD,
> here), but nothing about 950SDX!
> 
> I think, I got the problem with empty battery here in my TS950SDX.
> When I turn on the RIG, everything looks OK for about 2 seconds, then I get
> telegraphy notification "UL" (? I don't know what it might be -- "U" is
> normally for USB, "L" for LSB, but both "UL"....), and then lost numbers on
> a display.
> Display looks like   " .  .  .  .  .  .  . kHz   0.00 kHz".
> 
> When I RESET RIG, it looks OK for a 2 seconds, and then the same story!
> 
> BTW, I have a both, The Instruction and The Service manual, but there is
> nothing much
> about Battery Replacement. Mentioning a Kenwood Service, but the nearest one
> is too far away from here!
> 
> Rick, KN3C, wrote in his article:"... Just thought I'd pass along this info.
> The memory batteries are about $9.50 from Kenwood or Dantona a maker of
> cordless phone and memory batteries available from most electronic
> distributors
> also has them for less. You have to remove the digital unit to replace the
> battery. It's
> no 5 minute job, but well worth the effort to avoid a bigger problem."
> 
> Nice article, but KN3C changed e-mail address, and I have to ask a few
> questions this way!
> Also found a nice article by Don Rasmussen, but related to TS850S. He
> mentioned  the WEB
> of N6TR, and very nice article (with a pictures) there, but also for the
> 850S!
> 
> Is that mean (KN3C: "...a 5 minute job...") that I do not need to get off a
> front panel to get out Digital Unit where a battery is placed?
> Is it a bigger problem with 950SDX?
> Do I need any Voltage to bring to battery's connection points while I'm
> replacing a
> battery?
> Could anybody, please, give me some more info about that battery (V?,
> size?...), just in a
> case I can not find the original Kenwood battery!?
> 
> All suggestions are more than welcome!!!
> 
> Thanks in advance !
> 
> 73, Goran, T98G (ex.4N4AE)
> t98g at teol.net
> 
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