[Elecraft] My K2 lost audio
Chris
ve3uvt at gmail.com
Fri Aug 5 10:42:12 EDT 2022
After following Don's suggestions, the issue was found to be from the
failed KDSP2 module. I have replaced the KDSP2 with my extra KAF2 module
and got the audio back. Now, I have to troubleshoot the KDSP2 module. As
I am getting the audio on and off intermittently with the KDSP2, I will
check if there is any solder joint.
Many thanks,
Chris KM1B
On Fri, Jul 29, 2022 at 1:47 PM Don Wilhelm <don at w3fpr.com> wrote:
> 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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