[R-390] Off switch Doesn't

[Mark Huss]

The standard fix when I was in the Army was to replace them.  Not hard, 
though the down-time waiting for a replacement was a while.  Often long 
enough we would just go ahead and disassemble the micro switch and 
burnish the contacts.  After they were pulled mostly from the field and 
used for training purposes, we just took a rubber mallet and gave the 
front panel a whack where the micro switch was.  It invariably fixed 
it.  Never had to do the same receiver twice.

Les Locklear wrote:
> 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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