[Collins] Problem with a KWM-2

[Glen Zook]

One thing to do is to tighten all of the machine
screws that go through the chassis.  These definitely
come loose and/or become corroded over the years.  All
of the grounds in the unit are made through these
connectors and many "screwy" problems can be traced to
this hardware.

The feedthrough from the i.f. is the most probable
cause for your problem and tightening the hardware can
definitely help.  Of course there can be other
problems.  But, I have found that about 90% of the
"screwball" problems on equipment that I service for
others can be traced to loose and/or corroded
hardware.

My 75S-3A receiver has been located in basically the
same position on my main console for over 30 years.  A
few months ago it started having some intermittent
problems.  I put it on the service bench and found
that at least 20% of the machine screws had loosened
over the years.  After retightening the screws and
checking the alignmnet ("just in case") the receiver
was performing just like new.  It is the heating and
cooling cycle that happens every time you turn the
equipment on and off that causes the problems. 
Frankly, it is going to happen no matter what although
it takes years generally for anything to become a problem.

Glen, K9STH

Website:  http://k9sth.com

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