[R-390] R-392 microswitch

[Bruce Ussery]

Under a microscope the little pins (about .040 in. dia.) holding the lid =
on became obvious. They are flush with the body so easily missed, =
especially late at night with tired eyes. I pushed them further in with =
a sharp tool and it came right apart. The contacts looked nasty but =
cleaned right up. Contact resistance now reads about 10 milliohms =
consistently instead of many ohms.=20
Now I just have to decide the best way to close it back up since the =
little pins are pushed into the body forever. And should I leave the =
contacts dry or maybe add a dab of Deoxit?

Thanks,
Bruce
  ----- Original Message -----=20
  From: David Medley=20
  To: Bruce Ussery=20
  Sent: Tuesday, January 20, 2004 8:30 AM
  Subject: Re: [R-390] R-392 microswitch


  Bruce,
  I have repaired a number of these from the R-390/390A radios. I assume =
the R392 is the same. You just have to pry harder to get the lid off. If =
you look carefully you will se there are a couple of studs that also =
hold it on. When you get it off make a careful note of where all the =
parts go before you disassemble it to clean it. The usual failure mode =
of this is "stuck on". I don't know that I have struck the mode you have =
but you will find out when you open it.
  Good luck
  Dave


  Bruce Ussery <wa4zlk@acer-access.com> wrote:
    Gentlemen;
    I'm trying bring this recently acquired R-392 back to life. It would =
work
    long enough to tell it's in decent shape (although the dial seems to =
read 10
    kHz high - I may have questions about that later). But it keeps =
dying - dial
    lights and all, which I traced to the microswitch activated by a cam =
on the
    main function switch. I've got the beast extracted, and it acts like =
it
    might be fixable if I can get into it and clean the contact. I've =
pried the
    seam with an X-acto pretty firmly but no luck yet.
    Was just wondering if there's a secret method, or do I just need to =
pry
    harder. Don't want to get in a hurry and trash it with no spare in =
sight. It
    seems somewhat free all the way around the seam.
    Is this the same switch that sticks ON on the R-390A? (Don't have =
one of
    those yet.)
    I'll take it to work tomorrow and look at it better under a =
microscope.
    Yikes.. it's already tomorrow...

    73,
    Bruce
    WA4ZLK

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  Sincerely
  David
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