[Elecraft] My K2 lost audio

[Don Wilhelm]

Chris,

Do you still have sidetone?  If so Control Board U9 is still active, so 
check the MUTE signal and CB Q6 and Q7 operation.

If you have the KDSP2 installed, remove it and install 2 wire jumpers 
one between CB J1 pin 1 and CB J2  pin 1.  The second jumper between CB 
J1 pin 2 and CB J2 pin 2.
If that restores the audio, you have a problem on the KDSP2.

73,
Don W3FPR

On 7/29/2022 2:07 PM, Chris wrote:
> A quick update on this.  George, W1JHR, suggested checking the faulty
> headphone jack.  It could be an easy fix, but my case is different because
> I don't get audio on the headphone jack either.  The issue seems to be
> somewhere on the AF circuit.
>
> I get the audio back if I leave the radio turned off long enough, but it
> disappears about 10 minutes after powering on, so something must trigger
> the loss of receive audio.  Any suggestions will be helpful.
>
> Many thanks,
>
> Chris KM1B
>
>
> On Tue, Jul 26, 2022 at 10:43 AM Chris <ve3uvt at gmail.com> wrote:
>
>> Hello,
>>
>> I have two K2/100, and one of them developed an issue last night.  It
>> suddenly lost audio.  The S-meter is working, and it transmits fine but no
>> receive audio.  When I leave it long enough, the audio comes back
>> occasionally, then goes off.  I get the same results from the headphones,
>> so the issue must be in the AF section.  Any suggestions?
>>
>> Many thanks,
>>
>> Chris KM1B
>>
>>
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