[Elecraft] K2 - KDSP2 Circuit Diagrams

[David Wilburn]

Was the board installed and in service, and functional, or is this DSP
newly built, and you are troubleshooting it?
-  

David Wilburn
dave.wilburn at verizon.net
K4DGW
K2 S/N 5982


On Wed, 2007-11-14 at 13:53 +1100, KBG Luxford wrote:
> I am trying to find a fault in my KDSP2.  Do circuit diagrams of the two 
> boards exist with higher resolution of the logic signals?  Many of the 
> signals in the diagrams in the manual seem to be done with a low 
> resolution dot matrix printer and they are awfully hard to read.
> 
> The LED lights up and does not go out.  In menu, RTC can be turned off 
> or on, but when on, no DSP menu can be accessed.  Repeated holding AFIL 
> cycles through the filters.  SSB signals are heard in the speaker but 
> sound as if they come through a narrow filter, or are distorted.  I am 
> trying to trace the lines from the on board connector pins to their 
> connections on the board.  So far, I have only found a missing link from 
> pin 20 of J2 to U7 which I have repaired.
> 
> I have tried a new microcontroller U1, but no go.
> 
> Maybe the simplest way out of this is to buy a new KDSP2.
> 
> 73
> Kevin
> VK3DAP / ZL2DAP
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