Dick, Here is a link to information on many Elecraft products. https://www.qsl.net/wb4kdi/Elecraft/index.html
Scroll down and you will see the KPA500. You will see the schematic links. Select the Low Pass Filter. It is REV D2 dated 12/5/13. I believe that is the latest. The schematic I have is from 1/30/11. 73, Mark, WB9CIF -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Dick Bingham Sent: Thursday, May 2, 2024 02:16 To: elecraft@mailman.qth.net Subject: [Elecraft] KPA500 Failure -- An update on my KPA500 failure -- I extracted the amplifier/LPF assembly from the case and examined the two units: - Power FETs and all components *appear* to be OK - *LPF Module Rev D* bd appears to be what failed. The SM component positioned between C97, C110 and C111 *MAY* be C96 - hard to identify after cleaning the white vapor-deposited 'stuff' from the PCA using acetone solvent. There was what appeared to be a "tombstone-positioned" '*something*' sitting on a pad in the damaged area that I can not identify. I have not been able to locate a schematic or PCA picture for this LPF assembly to identify the missing component. If someone could provide a link to the Rev D LPF assy, I would appreciate it very much. 73 and TU to all who have, so-far, provided helpful suggestions. I am now waiting to hear what Elecraft's Service Department has to say about the failure info and picture I sent to them today. Dick/w7wkr ______________________________________________________________ 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 markmus...@outlook.com ______________________________________________________________ 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
