[Boatanchors] Dark deposits on rotary switch wafers

[Glenn Little WB4UIV]

Your "Black Crud" is most probably silver oxide (as conductive as 
silver) or silver sulfide.
You should see the latter only if you live near a waste treatment plant 
or other source of sulfides.
Scraping it off, unless you have the skills of a plastic surgeon, will 
also scrape off the silver leaving you with a very unreliable switch.

73
Glenn
WB4UIV

On 8/13/2018 2:20 PM, K5MYJ wrote:
> I have a SX-111 that had a problem with the band switch.
>
> I tried cleaning it with DeOxit several time without success.
>
> For some reason a black crud built up on the rotors. I finally had to 
> scrape it off with an X-Acto knife.
>
> I have no idea what the crud was.
>
> Bob Macklin
> K5MYJ
> Seattle, Wa.
> "Real Radios Glow In The Dark"
> ----- Original Message ----- From: "Kenneth Grimm" <grimm at sbc.edu>
> To: "Rob Atkinson" <ranchorobbo at gmail.com>
> Cc: "Boat Anchors List" <boatanchors at mailman.qth.net>; "Grant 
> Youngman" <ghyoungman at gmail.com>; "HL1FB" <yonglee at yonsei.ac.kr>
> Sent: Monday, August 13, 2018 7:25 AM
> Subject: Re: [Boatanchors] Dark deposits on rotary switch wafers
>
>
>>  "..But we're talking about radio hardware, not a tea service or
>> the Stanly Cup..."
>>
>> I couldn't agree more!
>>
>> Deoxit D5 is all you need.  Please avoid destroying a perfectly good 
>> switch
>> by using a Dremel tool.  With a brute force treatment like that one 
>> little
>> slip and.....
>> Deoxit won't make it shine, but WILL keep it working if all that is 
>> wrong
>> is a coating of silver oxide (which is a conductor anyway).
>>
>> 73,
>> -- 
>> Ken - K4XL
>> BoatAnchor Manual Archive
>> BAMA - http://bama.edebris.com
>> ______________________________________________________________
>> Boatanchors mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Boatanchors at mailman.qth.net
>>
>> List Administrator: Gary Harmon, K5JWK
>> ** For Assistance: gharmon at idworld.net **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html 
>
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Gary Harmon, K5JWK
> ** For Assistance: gharmon at idworld.net **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"