Further info:
I sat down today and performed another firmware load per Fred's sequence
with no change. I then tested for any heat generation from the driver
and finals of the LPA module and could not detect any.
I dug out my old Tek 475A scope and did some signal tracing and verified
that I have appropriate RF coming into the LPA module (pin 3 on P71A) as
well as 12v coming in on pins 9 10 of P71B. I also have a logical HI
on the 7T line (pin 1 of P71A) during XMIT. I do not have RF coming out
on pin 1 of P71C.
I just emailed support with the same report, but I'm guessing my LPA is
shot. Anybody have any idea what that will cost?
Thanks again for all the suggestions. I think I have it narrowed down
pretty well now.
73,
Dave W8FGU
On 6/19/2012 9:13 AM, Dave Van Wallaghen wrote:
Thanks for all the replies. I will try these suggestions tomorrow
(working today) and post my results to the list for future reference. I
will try the heat test on the LPA finals and driver first as I have all
the panels off and it will be a quick way to find out if that is where
the problem lies (kind of leaning that way).
Fred, I read some of the same comments with regard to the firmware
reload. I did in fact reload it a couple of times but not with the same
power on/off/removal procedure you stated. If the LPA test is ok, I will
try the reload again using your sequence. I always turn the K3/P3 off
and then back on again after a load, but I have not tried the power
removal technique.
Thanks again guys and I hope to have some results early tomorrow morning.
73,
Dave W8FGU
On 6/18/2012 6:37 PM, Dave Van Wallaghen wrote:
Hi all,
Before I contact service, I thought I might post my problem here in case
it is something fairly simple.
I returned from a 2.5 week vacation a couple of weeks ago and sat down
to do the firmware upgrade to my K3. I had my K3 powered off and
disconnected the antenna while away but it was still connected to a
serial hub, paddles, P3 etc. It powered up just fine and I have never
received any type of error message. After the firmware upgrade, I went
to perform the TX Gain Calibration and noticed there is no power output.
No matter what power level I set, I have no output either via the Tune
function or keying. In fact, hitting the ATU Tune button only displays
- - on the front panel. I can hear the relays go through their
routine, but it never displays the SWR.
I searched the archives and found a few who reported similar problems,
but only a couple of solutions and a few without any resolution. I've
ruled out all the settings things I could find i.e Test Mode, Tnx Inh is
set to off etc. I did remove the KPA3 and I/O board and inserted the
bypass connector and still the same result. I do have transverter
output, so it is something past that - I'm presuming in the LPA area.
I really don't know if I had power output before the firmware upgrade or
not as I just didn't think to try it especially without receiving any
kind of error message. And I'm pretty sure everything was working before
I left for Dayton.
Anyway, I just thought I'd ask here first before contacting service in
case it is a known problem I just didn't find on Nabble.
Thanks in advance 73,
Dave W8FGU
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