K2 just quit working.

[Gary D Krause]

My K2 #6113 just quit working.  I was listening to the 40 meter band and
all of a sudden no signal, and no audio.  The display works but, the
frequency is frozen.  The only other control that works is the power
level.  None of the buttons work and the frequency can't be changed.  
There are no error messages on power up and it powers up as normal with
"Elecraft" and then goes to the frequency.

I'm getting ready to take out the control board and have a look.  Any
help would be appreciated.

I recently had a problem with SSB transmitting just stopping so, I may
be related.
 
Thanks,
Gary, N7HTS
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[Don Wilhelm-4]

Gary,

The first order of business would be to look for an unsoldered
connection.  The likely places are the Control Board and the Front Panel
board.  Sorry, but I cannot speculate further without additional
information.  If you do not find that elusive solder connection, then
you should begin troubleshooting with the DC voltage measurements -
again, the Control Board and the Front Panel Board are the initial prime
suspects.

73,
Don W3FPR

Gary Krause wrote:

> My K2 #6113 just quit working.  I was listening to the 40 meter band
> and all of a sudden no signal, and no audio.  The display works but,
> the frequency is frozen.  The only other control that works is the
> power level.  None of the buttons work and the frequency can't be
> changed.  There are no error messages on power up and it powers up as
> normal with "Elecraft" and then goes to the frequency.
> I'm getting ready to take out the control board and have a look.  Any
> help would be appreciated.
>
> I recently had a problem with SSB transmitting just stopping so, I may
> be related.
>

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[Gary D Krause]

I took out the control board and checked the solder connections.  I re
flowed some of them that looked suspect.  My K2 is now up and running again.

Thanks,
Gary, N7HTS

Gary Krause wrote:

> My K2 #6113 just quit working.  I was listening to the 40 meter band
> and all of a sudden no signal, and no audio.  The display works but,
> the frequency is frozen.  The only other control that works is the
> power level.  None of the buttons work and the frequency can't be
> changed.  There are no error messages on power up and it powers up as
> normal with "Elecraft" and then goes to the frequency.
> I'm getting ready to take out the control board and have a look.  Any
> help would be appreciated.
>
> I recently had a problem with SSB transmitting just stopping so, I may
> be related.
>
> Thanks,
> Gary, N7HTS
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
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[Geoffrey Mackenzie-Kennedy]

Gary,

If the same problem happens again, try removing the Control Board MCU U6
from its socket, and then putting the IC back into its socket. I had the
same problem twice, once a couple of years after building the K2 and again
about a year later, although the power level control did not work either.
The cause of my K2's problem in both instances was poor contact between one
or more of U6's pins and the socket due to 'corrosion', a known design
problem with the type of socket supplied. In the end I replaced the socket
with turn pin (machined) type.

73,
Geoff
GM4ESD


Gary Krause <[hidden email]> wrote on
Saturday, February 16, 2008 at 2:33 AM

>I took out the control board and checked the solder connections.  I re
>flowed some of them that looked suspect.  My K2 is now up and running
>again.
>
> Thanks,
> Gary, N7HTS
>
> Gary Krause wrote:
>> My K2 #6113 just quit working.  I was listening to the 40 meter band and
>> all of a sudden no signal, and no audio.  The display works but, the
>> frequency is frozen.  The only other control that works is the power
>> level.  None of the buttons work and the frequency can't be changed.
>> There are no error messages on power up and it powers up as normal with
>> "Elecraft" and then goes to the frequency.
>> I'm getting ready to take out the control board and have a look.  Any
>> help would be appreciated.
>>
>> I recently had a problem with SSB transmitting just stopping so, I may be
>> related.
>>
>> Thanks,
>> Gary, N7HTS

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