[Elecraft] K2 Aux Bus - DC Bias at 9pin Connector ?

[Curt Milton]

Don

Thanks - that was the hint i needed to sort out the
maze of connectors.  

Yes it was open from KAT100 U1 pin 40 to K2 Control
Board P4 pin 2.  So i opened the K2 and laid
everything flat -- each board was ok.  I powered up
and it came to life.  I suspect the ribbon cable
between the K2 control board and KPA100 was pinched. 
I carefully put it together and all is well now.  

Thanks again for your help, and verifying voltage on
your own K2.  

73, Curt K2 #2117

--- Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Curt,
> 
> All options use the Auxbus - your KSB2, the KPA100
> and even the KIOC 
> chip inside the K2 use th eAUXBUS.  If the K2 is
> working normally when 
> the KAT100 is attached, then the AUXBUS signal is
> working.
> 
> What is the problem with the KAT100?  If it is not
> recognized in the K2 
> menu, then the KAT100 firmware chip is not
> communicating with the K2 
> (yes, it uses the AUXBUS for that).  Be certain all
> pins of the KAT100 
> firmware chip socket are soldered (did you miss
> soldering pin 1? - that 
> often happens).  Connect the cable to the KAT100
> (turn power off) and 
> check continuity from KAT100 U1 pin 40 to K2 Control
> Board P4 pin 2 - 
> somewhere near 470 ohms is expected.
> 
> If all the above is correct, the KAT100 firmware
> should be communicating 
> with the K2.
> 
> 73,
> Don W3FPR
> 
> 
> Curt Milton wrote:
> > I am still troubleshooting my KAT100, and now I am
> > wondering if the problem might be the aux bus.  
> >
> > When the 9-pin connector is attached to the K2,
> and
> > the KAT100 is disconnected - should there be 5-6
> volts
> > DC on pin 6 ?  I see voltages on pin 8 and 9, but
> > nothing on pin 6.  (And yes i verified the cable
> is ok
> > on pin 6).  
> >
> > I had previously checked the DC path from pin 6
> back
> > to the IOC in the K2 - but I hadn't probed this
> any
> > further.  
> >
> > I suspect there are no other users of the Aux Bus
> > except an ATU (my K2 has only ssb, 160m and kpa100
> > installed).  
> >
> > Info appreciated.  
> >
> >
> >      
>
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