[K2] [Elecraft] K2 Operating Problem

[Don Wilhelm]

Bill,

Since the XIT button (and the other buttons) works it is an indicator 
that the pushbutton matrix decode is working in general - which could 
point to the MENU pushbutton itself as the problem - remove the front 
panel assembly and check the soldering to the MENU button carefully.  
The only other thing I can think of that might be wrong is internal to 
the MCU itself - not processing the input correctly.

You asked about troubleshooting with your DMM - unfortunately, these 
signals are digital and the results consist of pulses at the appropriate 
time, so drawing conclusions from DMM readings is very 'iffy'.  One 
thing you can check while you have the Front Panel assembly off is to 
make a resistance reading between front panel U2 pin 6 and U3 pin 6 - 
when you press the MENU button, the resistance should go to nearly 
zero.  If it does not, the pushbutton (or its soldering) is faulty.

73,
Don W3FPR

bill KE5KWE wrote:
> Thank you Don and Dave for your replies.  I tend to agree with you Don that
> these are two seperate problems, but I don't know.  In answer to your
> question the XIT button does work as well as all other buttons.  I did
> forget to mention that the antenna tuner is a KAT2, which is installed.  
>
> My elmer did suggest that if the wire had become broken or possibly came
> into contact with the side of the travel trailer (ie. metal) it could have
> experienced RF feedback which would cause it to lock up and if it were
> strong enough might have fried the menu.  I don't know, nor do I know how to
> test for this.  I did disconnect the long wire and ground.  Reconnected
> another wire not in contact with anything and the both problems persisted.
>
> Bill
>
>
> Don Wilhelm wrote:
>   
>> Bill, Check to see if the XIT button works and report back here.  I
>> believe 
>> you may have a bad solder connection on the front panel board.
>>
>>
>> 73,
>> Don W3FPR
>>
>> bill KE5KWE wrote:
>>     
>>> 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
>>>
>>>   
>>>       
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