[Elecraft] KPA500 Failure

[Mark Musick]

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-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Dick Bingham
Sent: Thursday, May 2, 2024 02:16
To: elecraft at 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
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