Hi, this morning I got off on a tangent (when I should have been running
JA's in the WPX contest on 40m at 6 points a Q!). My K3S has been powering
back on right after powering it off. As I was diagnosing things and
removing the ACC connection etc... on one of the power off attempts it
stopped coming on at all?? I reverted to my backup K3 and finished my
lackluster effort in the contesting and now I'm scratching my head over the
K3S not powering up. If I removed the acc connector the K3S would stay
powered off... and I don't have anything on pin 8 for the remote power
on... anyway, the bigger issue now is that I can't get it to power back on.
I checked the obvious stuff like the breaker on the back and then pulled
out the KPA100 and removed the bottom panel to poke around and check the
polarity protection diodes. I'm not seeing anything obvious and the diodes
are fine, I'm getting voltage to the mosfet source pins 1,2 and 3 on
switching package U2 (DMP4015SSSQ)... the typical diodes along that path
check out fine from what I can tell where the drain pints 4,6,7, 8 send
power to the external 12v RCA jack on the back of the K3S. However
pressing the power button doesn't seem to be charging the gate on the
package and there is likely some other circuit in the mix anyway.
I also tried the 10 second power button hold to get into the MCU boot
loader mode, thinking something got jacked up on one of the power off power
on cycles and I need to reload the firmware of something... nothing...
There is no life at all or any indication of power in the front panel
etc... It's a sick little puppy!
If anyone knows something I couldn't find via google, I'm all ears, and
I'll fire off an email to Elecraft support and ship it in for service. I'm
not sure I want to get too crazy chasing thing down from the front panel
all the way though.
Thanks for reading. Max NG7M
--
M. George
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