[Elecraft] KX-1 dead :(

[Tod Glenn]

On Oct 1, 2006, at 10:34 AM, Ron D'Eau Claire wrote:

> Tod, look for a short in the +12 circuit to ground. The swollen  
> batteries
> suggests they were feeding lots of current into a dead short for a  
> long
> time.
>
> Open the unit and do the resistance checks at the top right column  
> on page
> 54 of your manual. If those checks disclose a short, follow the PCB  
> traces
> back to the power switch. You may find that one carrying +12 has  
> burned open
> from the heat of the batteries.


All checked out OK

I just completed the voltage checks on page 27 of the assembly manual

Here's a comparison of the results when working versus now

U1 pin 1 was 4.94v now 19.5mV
U3 pin 6 was 6.05v now 2.47v
D2 Anode was 14.83v now 2.7v
D2 cathode was 13.75v now 2.5v

Voltage measured at the supply is 12.3v (Astron AS-35)

Tod



----
Tod Glenn
N7WD
NAQCC #1283
SKCC #1444
FISTS #12134
ARCI #12420
n7wd at cordite.com