[Elecraft] KDSP2 LED Stays On and No Audio

[Don Wilhelm]

Ed,

Check the soldering for the headers that connect the DSP module to the 
board.  If there was a marginal solder connection, removing and 
re-inserting the module may have made it non-functional.

Did you use good anti-static measures when the DSP module was removed, 
stored while it was out of the K2 and during the re-installation?  If 
not, the DSP module itself may have been static damaged.  Swapping with 
a known good DSP module is the best test if you can find a local with a 
module.

I have no other suggestions at the moment.

73,
Don W3FPR

Ed K wrote:
> My KDSP2 has operated very well over the past 2 years and four months since I built 
> it... until last Saturday.   I had removed it to work on the front 
> panel, installing indicator LEDs in the key caps as per the LA3ZA mod which went very well.   When I reassembled 
> the rig to test out the mods the KDSP2 was not functioning properly.   
> With the module removed and replaced with a unpcb bypass board, audio is 
> restored.   I have made no changes to the DSP2 module and I do take the 
> precaution of working with my grounded static drain mat and wrist band. 
>
> The KDSP2 LED stays on instead of extinguishing after a few seconds which 
> indicates that communication is down.   I verified that all connectors 
> and pins are aligned properly and the battery measures 6 V.   With the KDSP2 installed, even though 
> the LED stays on, I am able to cycle through the filters using the 
> XFIL/AFIL Front Panel switch... but, no audio.
>
> I seem to remember this problem coming up once but can't recall what to do to cure 
> it... wish I had written it down when I had come across it before.   It 
> seems that it is something simple that I am overlooking. 
>
> I appeal to your collective wisdom in solving this problem... Thanks, 
>
>   
>