Yes prevention is better than cure.
The problem with aqueous cleaning or rinsing can be often not so much
getting the cleaner/rinse in but getting it out after, capillary traps being
the main cause of concern.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Friday, November 16, 2007 7:47 AM
To: [log in to unmask]
Subject: Re: [TN] no-clean flux residue on connector pins
One of the problems with many "no-clean" fluxes is that they sublimate and
re-condense on cooler parts. I've often seen connector issues, such as you
describe. Easy cure: have a mating connector in place during soldering!
Brian
Phil Nutting wrote:
> Good afternoon,
>
> A problem has cropped up with a board built by a CM. The board was
> soldered using a no-clean flux (I don't know which one yet) and
> apparently it got on the fine pitch pins of a micro D-Sub rendering
> the board non-functional because of the insulative layer of flux on
> some or all pins.
>
> So if you are sending a board to a CM;
> do you specify the method of cleaning the board?
> do you specify parts that must be clean after the build?
> if no-clean is used, but you require a clean board to a specific
> IPC level, isn't it better to use an OA or RMA washable flux?
>
> Replacing these connectors my be more costly than simply trashing the
> boards due to the time to remove and replace the connectors not to
> mention the possible reliability issues. I believe the only feasible
> method of removing this connector is with a selective soldering system
> so all 64 pins can be unsoldered at the same time. Don't have one of
> these systems.
>
> Assuming I can find out what flux was used is there a way to clean
> these connectors successfully? Sounds like a call to Zestron.
>
> Thanks in advance.
>
> Phil Nutting
>
>
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