jwsmail at jwsss.com
Tue Apr 25 04:08:13 CDT 2017
On 4/25/2017 1:39 AM, Pete Turnbull via cctalk wrote:
> "Little residue" would be more accurate, and some of that residue will
> be water (look up "azeotrope") - plus you need a lot of alcohol for
> something the size of a PDP-8 backplane. Blow dry, even after an
> alcohol rinse.
In the process of cleaning optics indeed you need air and other means to
do that, you are right. But in this case I'm suggesting the alcohol as
a way to displace water out of internal parts. The spotting or such is
not much to worry about in the cleaning job on a computer part.
But in optics the process is much longer and elaborate, but still needs
the ventilation to be sure you don't have a problem with fumes.
We had a booboo in assembly that required cleaning and we no longer had
freon cleaner we wanted to use in that quantity, so we went with the
water / alcohol process. A switch had defective sticky seals on it and
they had all gotten waterlogged. Vendor claimed they would survive
water process wash and they were wrong. Paid us quite a bit in credit
for messing up a couple hundred boards before we caught the problem.
Solution was to rewash in water then alcohol rinse.
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