[Elecraft] K2: No audio after fitting KDSP2

[Don Wilhelm]

Mick,

It is normal to hear a bit of a pop when plugging in the speaker. It is 
about the same volume as the pop you may hear when powering the K2 on.  
That is the sound of the output electrolytic in the audio amplifier 
charging or discharging.
It is not usual to cause damage by plugging in the speaker, even with 
power on, although the speaker itself could be damaged - try another 
speaker or your headphones in the EXT SPKR jack.

Since you have no speaker audio with the KDSP2 removed - did you plug in 
the rework eliminator correctly?
Did you plug the speaker connector into P6 on the RF board?  If you used 
P6 on the Control Board, there is no audio at that point.
Do you hear audio in the headphones?
Is the tab on P6 broken off?  If it is, did you plug the speaker 
connector in backwards?  The 'ears' of the header must face the front of 
the K2.

73,
Don W3FPR


On 4/27/2015 3:41 PM, Mick Hall wrote:
> Hi.
>
> My K2 has been working fine for a few months now and I was finding the background noise that gets pulled in very tiring, so I decided to buy the KDSP2 DSP filter.
>
> The build went fine and so did the install. After turning on the K2 I checked that the menu settings were all there and followed the manual. I then realised I did not have the  speaker plugged in, so I plugged it in while powered up. I got a loud pop through the speaker, then silence.
>   
> I thought that perhaps I had missed a menu setting whereby I would have to enable the KDSP2 but couldn’t find anything so obvious.
>
> I built the K2 with the Rework Eliminators installed, so I removed the KDSP2 and placed the header back in place and still I had no audio. I have also removed my KSB2 and KIO2 module so now I am back to the bare K2, but still I have no audio.
>
> I can only assume that something failed when I plugged in the speaker whilst still powered on.
>
>