[R-390] Off switch Doesn't

[Les Locklear]

NOS switches are available from Dan (Hank) Arney. Contact him at: 
hankarn at pacbell.net

Les Locklear
Gulfport, Ms.
Dx'ing since '57
http://www.hammarlund.info/

----- Original Message ----- 
From: "Jim Brannigan" <jbrannig at optonline.net>
To: "Barry" <n4buq at knology.net>; <r-390 at mailman.qth.net>
Sent: Thursday, November 06, 2008 8:32 AM
Subject: Re: [R-390] Off switch Doesn't


> Thanks for all the input on the switch.  Does anyone have a part number?
> Are the micro switches available from Mouser or other sources?
>
> Tnx
> Jim
>
>
>>>>>I understand the AC micro switch is a common failure point.
>>>>>The micro switch in my 67 EAC is welded in the ON position.
>>>>>Is there a replacement/fix for this problem?
>>>>
>>>>Sometimes you can "work" the switch actuator a bit with a small
>>>>instrument and sometimes it will free itself.  I fixed one that way one
>>>>time.
>>>
>>> This is never a permanent fix, and rarely anything but a very short-term
>>> one.  If the switch has welded itself once, it will do so again.  Even
>>> taking the switch apart and dressing the contacts is only a short-term
>>> fix.
>>>
>>> Microswitches are cheap -- buy a new one and install it.  Get the 
>>> highest
>>> contact current rating you can in the correct form factor.  While you're
>>> at it, buy two, so you'll have one for next time.  Put a proper snubber
>>> across the new switch to maximize its life.
>>>
>>> Best regards,
>>>
>>> Don
>>
>> I think in my case, it was just excess grease that had gotten down around
>> the plunger and was keeping it from popping fully back up.  Working it a
>> few times freed it up and it worked fine for years.  Yeah, welded,
>> corroded contacts, etc., are a different problem.
>>
>> Regards,
>>
>> Barry
>
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