[Elecraft] K3 - KEY OUT problem

[M. George]

Pete, just saw your question on the PTT OUT not working for you.  I had an
issue with this back in 2016... I can't remember what I did, but it wasn't
smart and it was my fault... Anyway, I let the smoke/metal out of the IRFI630G
that is used on the PPT out.  It's beefy and can take a lot of abuse, but I
still managed to destroy it.  Anyway, it's an easy replacement and saved me
from shipping my K3 back to Elecraft.  Total operator error in my
situation... maybe attached 12v to the PTT out?  Again, I can't remember.

Here is a picture of what my damaged MOSFET looked like at the time... see
the crack and leakage ;)

http://www.nc7j.com/pa/main.php?cmd=imageview&var1=NG7M%2FRadios%2FK3%2FSmokedKeyOutIRFI630G%2FIRFI630GFried.JPG

And here is the Mouser part I ordered to replace it:

https://www.mouser.com/ProductDetail/Vishay-Siliconix/IRFI630GPBF?qs=%2Fha2pyFaduhSYcFgYMU8ma88%2Fb96%2Fl4SGKWFSYSWEuEDdoRAAyNpCg==

Here is the schematic link:
https://ftp.elecraft.com/K3/Manuals%20Downloads/K3_Schematics_Jun_2010.pdf

Search for IRFI630 in the PDF, you will find it straight away... and I
don't remember it being tough to expose the damaged mosfet and replace
it...

Max NG7M

On Sat, Dec 28, 2019 at 8:57 AM N4ZR <n4zr at comcast.net> wrote:

> Thanks to everyone who responded.  I've now written to Elecraft Support,
> and anticipate that it will have to go back to the mother ship.
>
> --
>
> 73, Pete N4ZR
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-- 
M. George