I'm thinking the little mechanical spring-and-groove linkage that makes
the switch stay in one of two positions (i.e. on or off) isn't working.
If that's the case, contact cleaner won't work and your only options are
switch replacement, or having someone wire across the switch to make it
always "on" and using an external switch, or unplugging it, to turn it
on and off.
If you really believe carbon dioxide causes global warming,
you should stop exhaling.
The best contact cleaner to use is DeoxIT, actually improves
electrical connections/contacts OR use the whole can of a generic
contact cleaner and it may or may not work for a short period of time.
DeoxIT is unbelievable. www.deoxit.com or
for distributor info.
Suggestions by others may work but here is one more. Check the local
shoppers paper in your area and see if there is a radio restorer or
electronics repair guy. Some will do a simple job like that at a reasonable
price and he may have a box full of switches he can substitute. If you took
it to a real authorized repair shop they'd want $50 just to look at it, bus
some part time tinkerers will look at it as a challenge to fix, not a means
of making money.
A few years back I found a guy like that. I had a $500 circuit board from a
machine that needed repair. One place would repair it for $250, saving that
much over a new board. Found a local guy working in his basement and he
repaired it while I waited and hesitated to ask $5. I gave him $10 and we
were both happy.
I might as well toss in my 10 cents worth: buy a can of spray contact cleaner,
unplug the receiver, then spray the hell out of that switch with it in all its
positions. Spray it, work it, spray it again. Repeat several times. Let it
dry before you try to use the receiver again. While you're at it you might as
well squirt some in all the pots while you twist them back and forth.
You will probably have to take the cover off to really get the switch clean but
it's worth it to try it without doing that first. What do you have to lose?
One thing I definitely would not do is spray it with WD-40. That stuff gets
gummy after a period of time. Use contact cleaner... easily obtained at any
Radio Shack or Lowes. A big spray can is only a few bucks.
If that doesn't work then take it to a repair place that still works on analog
equipment. But I'd be willing to bet you'll get it to work with the contact
cleaner. Excellent stuff.
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