[Elecraft] KX1AT problem

[Don Wilhelm]

Paul,

The most likely problem is that you have a soldering problem or that the 
KX1 microprocessor is not fully seated in its socket or perhaps you have 
a pin bent out/under and is not inserted in the socket.  Examine closely 
again.

As for the soldering paths, make some continuity checks - take the KX1 
out of its case and plug the KXAT1 into its headers.  Check from KX1 U1 
pin 2 to KX1 U1 pin 17, check from KX1 U1 pin 6 to KXAT1 U1 pin 13.
Then apply power and check for 6 volts to ground at KXAT1 U1 pins 4 and 14.

It is possible that you have a firmware chip either in the KX1 or the 
KXAT1 which has a faulty output or input pin, but the best way to 
confirm that fact is to substitute a new firmware chip.  Make the checks 
above first to see if you can find a faulty path.

73,
Don W3FPR

Paul Brice-Stevens wrote:
> Hi,
> 
> I have built a KX1 with the 30m option al installed and its working fine.
> 
> I then built the KX1 ATU and it appeared to go together OK and on the 
> first install it worked and the KX1 recognized it and I started to play 
> around with the various settings...then when I next switched it on it 
> gives the '---' message and won't recognize the ATU.
> 
> I have checked as per the Troubleshooting guide: -
> 
> 
> 
> - Connectors seems OK
> - U1 appears insttaled OK
> - No idea how to check whether U1 is defective...
> 
> So any ideas what and how to check next?
> 
> 73 Paul G0WAT
> KX1  #1043
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>