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On 1/17/2022 12:57 PM, Sam Sargent via Elecraft wrote:
Elecraft KPA500 sn 1910 dead.
UPDATE 12/17/21
First. Thanks to everyone who has responded to mypost. I have read all
comments withinterest and have responded to several folks who offered ideas
that I havetried. Thank you for trying to help.
SECOND. Here is a bit of extra info that I havediscovered. I disassembled the
fuse blockand cleaned all contacts and the fuses with the “Deoxit” product. I
configured my “OWON HDS272S”meter/oscilloscope to measure resistance and noted
that the leads are about 0.7ohms. I connected the meter leads to theflat
prongs of the 115vac cord that was plugged into the fuse block on theKPA500.
With the rocker switch on thefuse block 3 in the OFF position (o) the meter
showed zero (0) ohms. With switch 3 ON (!) the meter showed 2.8ohms. Thus,
subtracting the resistance inthe meter leads, the resistance through the fuse
block changed from 0 ohms to2.1 ohms. I connected the 115vac cord tothe wall
socket and went through the power up procedure. No joy. I listened for the hum
of the transformer, and there was no hum. I am flummoxed!
CONCLUSION. Thisleads me to believe that the power cord, fuses, and fuse block
are functioning.
I think that my next step is to look into the possibilityof sending the KPA500
to a repair facility. I am open to your ideas. 73 Sam
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