[Elecraft] KSYN3A mod problem

[Fred Townsend]

Don:
Acetone should NEVER be used in electronic assembles. Acetone causes both
long and short term effects on various components including the PCB. It
effects epoxy, lacquers, paints, and plastics, particularly polystyrenes
where its effects are almost instantaneous.  Pour some in a polystyrene cup
and watch it immediately cloud up.

>From Wikipedia:
Acetone is a good solvent for many plastics and some synthetic fibers. It is
used for thinning polyester resin, cleaning tools used with it, and
dissolving two-part epoxies and superglue before they harden. It is used as
one of the volatile components of some paints and varnishes. 

Polyester resin, also called gel coat, in case you don't know, is the stuff
PC boards are made of. Leave acetone in the paint department where it
belongs. I suggest alcohol, any kind as long as it pure, be used for
de-fluxing PC boards.  

73, Fred, AE6QL
-----Original Message----- 
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don
Wilhelm
Sent: Monday, September 7, 2015 2:43 PM
To: Nick Lelyak
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KSYN3A mod problem

Nick,

Yes, but it fails when it cools again - something is not making good
contact, and it may be residue from the cleaner.  I can't be certain of
that, but I would get that cleaner residue off and try again.

I would suggest that you remove the cleaner residue from the contacts with
acetone - apply it with a brush or cotton swab and immediately wipe the area
with a clean cloth of paper towel.  Do only a few pins at a time, and do not
let the acetone dry on the contacts or board.
You may want to mate and unmate the front panel and RF board several times,
cleaning between each to hopefully clean some of the 'goop' out of the
female header.

If you do not have gold pins on the connector to the front panel, consider
asking Elecraft for the gold replacement pins.

73,
Don W3FPR

On 9/7/2015 5:27 PM, Nick Lelyak wrote:
> Thanks Don, Guy
> appreciate yours quick response.
> I found out that problem disappears when front panel warms up to 37 C 
> and more.
> Looks like problem somewhere in FP. To clean main connector I used 
> Electronic Contact Cleaner. It may works not so good as Deoxit which 
> is not widely available in Canada. In any case to move on have to buy 
> Deoxit first.
> Thanks again
>
> 73, Nick VE3FJ
>

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