[K2] [Elecraft] K2 Operating Problem

[Dave Van Wallaghen]

Hi Bill,

Let me preface this with the fact that I am by no means an expert here and
I'm sure a guru like Don, W3FPR will chime in here with a very well detailed
troubleshooting plan for you.

I am sure that your first instinct about a cold solder joint is right on. My
guess is that the move probably jostled something around and has now reared
its ugly head. If you tie the two problems together (freeze on tuning and no
menu) I would take a look at the front panel board around U2 and RP1. These
components decode the switches. Then follow the same path down to the J1
connector and its mating connector P1 on the RF Board.

After that, J7 on the RF Board and its mate, P2 on the Control Board. And
lastly, the switch info terminates at U6 (MCU) on the Control Board. Again,
this is presuming that there is a problem with the switch info getting to
the MCU properly. I would think an intermittent problem in this area may
cause the MCU to lock up or not respond to certain switch presses. 

Did you try cycling through other switches to see if you have similar
problems?

Like I said, I'm no expert, so take with a grain of salt. I'm sure someone
will come up with other suggestions for you. It's a good group here for
that.

Good luck & 73,
Dave W8FGU

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-
> bounces at mailman.qth.net] On Behalf Of bill KE5KWE
> Sent: Wednesday, June 11, 2008 2:40 AM
> To: elecraft at mailman.qth.net
> Subject: [K2] [Elecraft] K2 Operating Problem
> 
> 
> My K2, s/n 6301, has been built and operating for several months.
> However, I
> recently relocated and just now was able to put up a long wire antenna.
> It
> is connected directly to my K2 with a KAF2 installed.  I was able to tune
> it
> on all bands the radio operated fine for about an hour.  Then I decided to
> retune a band and the antenna tuner went through its routine, ie. heard
> all
> clicks and watched display count down and it suddenly froze up.  The only
> way to reset was by turning radio off and then on, again.  All appeared
> normal but when I went to change something using the menu button, I
> discovered that it no longer worked.
> 
> The menu would not come up.  But the radio was receiving properly,
> switched
> bands properly, the vfo worked properly, switched antennas properly and
> all
> filters work properly.  The radio is a QRP, CW only.  Any ideas of what to
> look for?  I will look for cold solder joints although that has been done
> previously.  Are there any tests that I can perform using only my
> multimeter
> and the radio itself?  Should I contact Elecraft about their repair
> service,
> unit is under warranty?
> 
> Thanks for any help you can give.  I am alone in Albuquerque, NM and my
> Elmer is in Alabama.  Should anyone on the Reflector be out here, I would
> love the company.
> 
> 73 de KE5KWE
> 
> Bill
> 
> --
> View this message in context: http://www.nabble.com/K2-Operating-Problem-
> tp17771046p17771046.html
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> 
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