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:[email protected]] On Behalf Of Don Wilhelm Sent: Monday, September 7, 2015 2:43 PM To: Nick Lelyak Cc: [email protected] 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 > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
