[Elecraft] Elecraft KPA500 sn 1910 dead, update.

[G4GNX]

A bit of a long shot - I presume you’ve checked the cover interlock switch?

73,
Alan - G4GNX



> On 17 Jan 2022, at 19:57, Sam Sargent via Elecraft <elecraft at mailman.qth.net> 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
>