Ken and everyone out there...
I finally opened up the Omni VI and exercised all the connectors
inside... and I haven't had the problem with the meter lights and
LED's going "dark" since. So, that problem seems to have been
solved, but, my heart sank when I noticed that I had created a new problem...
I put the rig back together and now the audio was muffled, distorted,
and signals were weak at best. Then I discovered that the PBT
control had no effect on the audio whatsoever. So, I opened up the
rig again, applied power, and poked around a bit. Finally, I decided
to try re-exercising the connectors going to the PBT control on the
back of the panel. When I turned it back on, I gave a huge sigh of
relief. It was working properly again... and continued to do so even
after I put it all back together! (I had visions of really messing
things up somehow... :-()
Thanks for the help... and just wanted to report that it's working
well, in spite of me...
Jim, AF3Z
At 1/27/2009 10:30 AM, you wrote:
Hi Jim,
> My Omni 6 has gone "dark" on me at times: By "dark" I mean that
> the light for the meter went off and the frequency display LED's were
> off as well. The rig continued to function normally... I completed a
> qso "in the dark" the one time. Turning the rig off and then back on
> has solved the problem each time.
>
> I assume that it may be a relay acting up.
> Am I on the right track? Any advice?
>
>
>
No, I do not think you're on the right track. The only relay in a
Omni VI that switches power is a single pole relay. If it failed you
would not have been able to complete a QSO. If the rig is still
transmitting and receiving, I think that relay must be working. Maybe
one of the connectors on the DC POWER INPUT BOARD, where the relay is,
is getting temporarily "fixed" by the vibration of the relay. I
recommend that you exercise all of the connectors inside the radio,
particularly those on the , DISPLAY CONTROLLER BOARD (Sometimes called
LED DISPLAY DRIVER BOARD), the DISPLAY BOARD, LOW LEVEL DRIVER/NOISE
BLANKER BOARD, and the DC POWER INPUT BOARD. Better yet, use some Caig
Laboratories De-Oxit to clean all of the connectors as you are
unplugging them and plugging them back in. While you're at it, inspect
for a possible cold solder connection to one of the connector pins.
The LOW LEVEL DRIVER/NOISE BLANKER BOARD has an interesting
combination of functions included on it. Aside from the two functions
that are obvious from the name of the board, there is also the regulator
circuit that provides the +REG voltage to the rest of the rig, and the
meter light dimmer control circuitry. If the fault were there it would
likely only affect the meter lamps and not the LEDs. The signal that
controls the LED brightness and the meter lamps comes from the LOGIC
BOARD, goes to the LED DISPLAY DRIVER BOARD and from there it also goes
to the LOW LEVEL DRIVER/NOISE BLANKER BOARD. My guess is an intermittent
connection in the cable between the LOGIC BOARD and the LED DISPLAY
DRIVER BOARD would affect both the LEDs and the meter lamps.
DE N6KB
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