[Elecraft] K3S dead.

Michael Carter Mike.Carter at unh.edu
Tue Apr 25 14:09:02 EDT 2023


Hi OM,

I would first disconnect anything connected to the
rear panel ACC connector - pin 8 may inhibit
the PWR_ON signal.  If nothing is connected
to the ACC jack, I would try temporarily grounding
the end of R77 (the other end attaches to pin 4
of Q2), which is the /PWR_ON signal.  If that
fails to power up the rig, you likely have a bad Q2
MOSFET.  There is a possibility that a problem
downstream of Q2 is preventing its drain terminal
from coming up at PWR_ON, but I would
see if you can force /PWR_ON to ground to
open Q2's channel.

If a forced /PWR_ON does turn on the radio,
then you'll need to look at the KIO3B module
and the Front Panel board.  I traced this circuit
out just recently, but I can't recall the precise
path from the front panel POWER switch to
the active circuitry......will look back at another
email on this issue.

73,
Mike, K8CN




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