[Elecraft] Elecraft KPA500 sn 1910 dead, update.

[Ken K6MR]

Not sure if this has been suggested:  did you check the fuses on the power supply board?  Those will kill the LV supplies and will keep things from powering up.

Ken K6MR
________________________________
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> on behalf of Sam Sargent via Elecraft <elecraft at mailman.qth.net>
Sent: Monday, January 17, 2022 11:57 AM
To: elecraft at mailman.qth.net <elecraft at mailman.qth.net>
Subject: [Elecraft] Elecraft KPA500 sn 1910 dead, update.


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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