Likely your issue is in the synthesizer circuit or, more likely a capacitor
somewhere in the power supplies. The lack of lock condition would allow
significant receiver noise but the “Loss of Lock” error should show on the
display if the PLL is out of lock.
However, the synthesizer could be in lock condition and still present no local
oscillator to the receiver or transmitter mixer, but the lock fault would not
be seen on the display in that case.
“Healing” is a common trait when marginal soldering (common on Paragon PLL
boards) and old electrolytic capacitors are involved, as are thermal faults.
The very best way to troubleshoot is to acquire some freeze spray and allow the
radio to warm to fault condition. Then lightly spray components in the areas of
concern to see which part causes the radio to go into proper operation. It
usually only takes a small amount of cooling action to elicit thermal failure
problems.
You can pretty well spray anywhere in the radio without harming anything but
try to prevent over-cooling, which could cause freezing so extremely as to
cause water condensation.
Also, you can use hair dryer with a small focusing nozzle on the blower output
to aim heat on parts (with the radio already cold) to see which part causes the
fault condition. Again, this is safe for all of the parts in the radio as long
as you use a air dryer, not a heat gun, which can melt parts.
Gary
> On Sep 29, 2018, at 2:40 PM, arsn4dd@charter.net wrote:
>
> Is there an Omni V mechanic in the house? My radio is going to need
> one if it doesn't straighten up... HI HI
> I have a very sparingly-used Omni V.9 that has developed an
> intermittent receive issue. From a cold start, the radio powers up and
> operates properly. After some random period of time, I can power cycle
> the radio, and as a result, I lose receive signals. I retain plenty of
> audio, and plenty of what sounds like band noise, but there no signals
> anywhere. I can leave the radio off for a couple of minutes, power it
> up, and the signals return. Before the suggestion is floated, I have
> exercised every connection in the radio with DeOxit. I have tightened
> and re-tightened every screw on every board in the radio. I have not,
> however re-seated any of the chips. Is there enough information here
> to generate suggestions? I admit to being mostly an appliance
> operator, but I might be capable of doing a few diagnostics. Thanks in
> advance for any guidance.
> Best Regards to all!
> Dennis N4DD
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