[Elecraft] Elecraft KPA500 sn 1910 dead.

[Sam Sargent]

I bought this KPA500 from the estate of a friend whois a SK.  I queried Elecraft about themanufacture date and learned that the unit is factory built and delivered inMarch 2014.  The unit was originally setup to operate on 220 vac.

I used my KUSB cable to connect the KPA500 to mycomputer, attached a dummy load to the output, and connected the power cord tothe amp.  I had changed the fuse blockand installed two 12-amp EC fuses that I checked for continuity, reinstalledthe fuse holder so ‘115 V’ shows in the window, and made sure that the fuseblock was fully seated.  I removed thecover and, since my line voltage shows 123 vac, connected the yellowtransformer lead.

I set the rocker switch on the fuse block (3) to ON (!),then tapped the ‘ON’ switch (11) on the front panel.  There was no response to the ‘turn on’procedure.  The KPA500 is as dead as a doornail.

I have spent several hours trying to troubleshootthis problem.  I have checked my 120 vac,20 amp duplex outlet and a am sure that it is delivering power to thecord.  I have substituted another power cord.  The safety interlock (chicken) switch isdepressed by a pin mounted on the underside of the cover.  I have tested this switch and tested the ampwith the switch ‘locked’ closed, no joy. 
I have exhausted all thetroubleshooting ideas that are within my capabilities.  I hope that another KPA500 owner may be ableto provide information that I can use to get my amp up & running.  Thanks, Sam N1OVA