[Elecraft] K2 - Audio problem - Help!

[Ken Dailey]

Just wanted to let everyone know that thanks to Don's helpful hints,  
the problem has been found (yours truly forgot to install a couple of  
components!), and K2 #5294's audio problem is fixed.

Onwards to the next stage of construction!

73


Ken, G0RVH



On 18 Feb 2006, at 17:37, Don Wilhelm wrote:

> Ken,
>
> First thing to check is the voltage at U9 pin 7 - it should be  
> about the
> same as your power supply voltage.
> If that is OK, check continuity from pin 6 of U9 to the + side of  
> C29 and
> measure the resistance from the negative side of C29 to the  
> headphone jack
> (you can do that by removing the front panel - leaving the Control  
> Board
> attached to the RF Board) - plug the stereo plug shipped with your K2
> (remove the cover) into the headphone jack and measure to the solder
> terminals for both tip and ring - you should read 83 ohms for both.
>
> Check the soldering at the connectors between the boards as well as  
> at all
> associated components.
>
> If all the above checks out and you still cannot hear audio, send  
> us another
> note.
>
> 73,
> Don W3FPR
>
>> -----Original Message-----
>>
>> Hi Everyone,
>>
>> I'm just in the process of building my first Elecraft kit (a K2,
>> #5294).  Construction was going really well, but when I went to
>> perform the Audio Amp. & Tone Generator Test on page 46 of the
>> manual, I could not get any audio output from the radio at all.  I've
>> tried a couple of different sets of headphones, with no joy.  I've
>> checked the control board thoroughly for shorts, unsoldered componets
>> etc. and cannot find anything amiss.  I've also double checked the
>> components around U9, including R16, R17, R20, Q6, Q7 & C25 to C30,
>> all of which are OK.
>>
>> Aside from the lack of audio output, everything else seems to work  
>> fine.
>>
>> Does anyone have any suggestions on what I might have done wrong?  
>> (:-)
>>
>> 73
>>
>> Ken
>>
>> --
>> Ken Dailey, G0RVH
>>
>>
>>
>>
>>
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>

--
Ken Dailey