[Premium-Rx] Ailing Racal 6790/GM

[Barry Hauser]

Hi Martin & list ..

Just a thought, but for what it's worth:

The fact that it runs for an hour or two suggests it might be a failing
heatsink point.  Heatsink grease doesn't last forever -- it eventually dries
out.  An easy fix if that's what it is.  You could also try a can of that
component cooling spray, though I don't know if the fault would reset
immediately.  It might require cutting power and turning it on again after
shooting a suspect component.

One way to "feel around" for a thermal/heatsink problem is to let the
receiver go on fault, unplug and probe around.  If you find a heatsunk
component that's unusually hot, but the surrounding metal or finned heatsink
is cool, the thermal bond between the two is not effective.

Barry


> Greetings to all:
>
> My Racal 6790/GM has been having an intermittent problem:
>
> After listening for an hour or so, I start getting a lot of extraneous
> noise (no signal) followed by the fault light.
> Am guessing that it is a thermal failure in one of the components.
>
> When running self test, I get the indicator "01"
>
> If I let it cool off, it will be good for another hour or two.
>
> Any ideas and/or suggestions for narrowing down/diagnosing the problem?
>
> Thanks in advance to all for your help.
>
> Martin Colby
>
> San Diego, CA
>
>
>
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