John,
It would appear that your KX1 is OK except for the burned/vaporized
board trace.
One possible cause is a short from Q6 to the case when it is assembled.
Check for burrs around the countersunk hole in the case and if you do
not have a nylon screw for securing Q6 to the case/heat-sink, you may
request one from Elecraft.
To repair the burned trace, scrape out all the burned part and clean the
solder-masking off the remaining ends of the trace. Lay in a wire and
solder the ends. If you want to make it 'pretty', use a bare wire
carefully dressed to fit the original path of the board trace and embed
it in a small amount of epoxy. A green Sharpie marking pen can color
the epoxy and make the repair almost invisible.
73,
Don W3FPR
John Shadle wrote:
One more reply (to myself). I'm looking for some assistance now, I think.
I checked resistance on the tab of Q6 and get 1k ohm.
Resistance at pin 1 of U1 is 3.13k ohm.
Both are supposed to be over 500 ohm, according to p. 58 of the most
current manual.
D7 checks out at .742 one way and .538 the other way, so I think it's
alright (forgive my lack of technical jargon; I'm tired).
I think the only thing I may need to repair is the trace between RP5 and
U8.
So, the question of the evening is...
Anyone have any idea why this happened? Was it just the fact that more
current was flowing through than necessary and my DC wasn't fused at 1A
or so? Everything else seems to be in order.
I just don't want worse damage next time, or to have to do this repair
more than once. Thanks for your help, all.
Off to bed!
-john W4PAH
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