18 Jul
2010
18 Jul
'10
3:33 p.m.
On Sunday, July 18, 2010 09:25:27 am Ralf Mardorf did opine:
On Sun, 2010-07-18 at 11:14 +0200,
fons(a)kokkinizita.net wrote:
True for the most part, but please do not place the common Freon TF in that
category when magnetic media is involved. 15 years ago at the tv station,
I got tired of paying for Freon-TF by the gallon, and cleaning the heads on
all our VCR's 2-4x daily, and tried cleaning one with paint thinner alcohol
from ACE Hardware. I didn't have to clean it again for a week! So I
switched cleaning agents on the spot. And it turned out that Freon-TF was
also much harder on the elastomer parts like pinch rollers. I cut the time
spent cleaning heads and rollers by 90%. Roller replacements went way down
too.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Humor in the Court:
Q. Doctor, did you say he was shot in the woods?
A. No, I said he was shot in the lumbar region.
On Sat, Jul 17, 2010 at 10:56:47PM -0400, Gene
Heskett wrote:
Fruit acids or pure alcohols are effective and relatively harmless, but
most effective are products by chemical companies, there are cleaners
with qualities comparable to penetrating oil, but made to fit to
electrical properties. Those cleaners will clean, resp. repair and
protect.
Some lubricant obviously made its way in there,
and one would have
to assume that the switched current was sufficient to cause a
microscopic arcing, which will in time create a smoke film on the
internals, which is what you were measuring, and which caused the
PSU to think the button was pressed full time. Lubricants are a
good idea only on a circuit that can be called a dry circuit, where
dry=microamp currents at very low voltages.
Ah, yes, these plastic things are often lubricated.
Washing it out with acetone was ok, but I would
probably have
reached for a can of paint thinning alcohol as it is less likely to
degrade the plastics.
I know, but the acetone was all I had available...
Ciao,