[Hallicrafters] Cleaning switches with aerosol

[k0ewu at juno.com]

RE DE-OXIT  I did not know that de oxit is conductive. I sprayed some on
the osc section wafer of an HQ-145 after about 10 minutes I turned it on
and  smoke  from the wafer. As there are no parts available tried to
repair the wafer... no success as yet.
suggestions?
jack

On Sun, 17 Jul 2005 15:46:47 -0700 (PDT) Mike Everette
<radiocompass at yahoo.com> writes:
> I tend to agree, BE CAREFUL, and LESS IS MORE.  I had
> a bad experience once with a Hammarlund HQ-180 which
> developed an intermittent in the selectivity switch. 
> That one is dense with parts and almost impossible to
> "selectively" clean.  I sprayed the offending wafers,
> rotated the switch around several times, etc and let
> it dry for a couple of hours.  
> 
> When the receiver was powered back up, one switch
> wafer arced over and was charcoaled, burned up beyond
> any hope of repair.  The phenolic wafer had absorbed a
> dose of the contact cleaner, which shorted it out to
> ground through the metal switch framework.
> 
> Very fortunately, in this case I was able to replace
> the switch.  That is, the COMPLETE assembly, prewired
> with all components, which made life much easier!  At
> one time it was still possible to obtain factory-stock
> Hammarlund parts from the people who bought it all
> when the plant in Mars Hill, NC closed; but sadly,
> this source has been gone for a number of years now.
> 
> Imagine frying a switch in this fashion in an SX-28 or
> (worse?) an SX-42 or (shudder) an SX-88?
> 
> Need I say more?
> 
> 73
> 
> Mike
> WA4DLF
> 
> 
> 
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