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@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 > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
