On Wednesday, April 29, 2015 at 3:22:55 AM UTC-5, bubba wrote:
I've heard of folks who also believe they can hose their appliances in the tub! Mr. Burns, evidently works in design or on customers' goods...therefore, extreme caution is necessary. I use similar cautions...but on a hobby basis.
A compressor acts as a dehumidifier. If the air in the tank is at 100
PSI at ambient temperature and 100% RH, the air coming out will have 15%
RH at the same temperature. I used to have to bleed off the water that
ended up in the bottom of the tank.
Blowing a paper taped to a wall would be a way to check for oil.
Hitting a fan with compressed air can ruin it or cause it to ruin
something else by generating electricity. I've read that compressed air
can cause dust to lodge where it will do more harm than before.
I want to support higher education. I'll hire a dozen coeds and issue
them attractive uniforms and drinking straws. They'll go door to door,
offering to blow out computers gently. If their voice modulation
doesn't sell the customer, the sight and aroma of their fishnet hickory
I worked at the Coast Guard electronics repair facility in Ketchikan.
Anything from Alaska's 6640 miles of coastline that couldn't be fixed in
the field came to us. The AN/URC-51 (UHF/SSB) was the eqjuipment we
always laundered. I didn't understand it, but it helped a lot. Now I
think the grime caused stray capacitance.
We used a caustic powdered floor soap that would probably have left a
film if not thoroughly rinsed.
In the early 1980s, my mother's 19" TV quit. The main board was covered
with syrup. Somebody must have put a sugary drink on the TV and knocked
it over. I knew she wouldn't tell, so I didn't ask. I just soaked the TV
in the laundry sink. I added a little ammonia. It was potentially
harmful, but it wouldn't leave a deposit.
The TV worked like new after that.
Over here it says 49,000 miles:
They point out the obvious, the closer you look, the longer the coast
gets. Measure around each pebble and it gets really long.
Of course, you could/can do that with discrete/legacy components, but
not any more these days. Maybe we can wash keyboard in the DW, well,
I suppose I can wash guitar amp. PCb board as well. Most today's
guitar amp. based on vacuum tubes have PCBs. Not much P-P wiring any
more unless it is boutique class high end stuff.
The circuitry of that TV was mostly ICs with lots of legs. Water under
an IC can take a long time to dry. Sometimes I use a little rubbing
alcohol to help get the water out by lowering surface tension.
What can't be washed these days? I wash keyboards in the kitchen sink. I
wouldn't want to get a relay wet.
This guy says he restored his Kindle by washing the circuitry with a
On Thursday, April 30, 2015 at 4:34:35 PM UTC-5, J Burns wrote:
When I worked in a repair shop (on PC boards for cash registers) we steam cleaned boards and dried them with compressed air. These were Cmos and Pmos design (Rockwell CPU's). I never had a problem with a board...and knew of no one else that had...
It's really great that you are posting here, my friend! I took a few
electronics classes in college in the early 70's as free electives
(instead of underwater basketweaving, popular at the time) mostly so I
could fix my car radio, 8-track, etc.... Instructor was around 75 and
wore a small black bow tie - not to be different, just because it had
always been his standard dress code. He taught the latest technology,
but also a couple of classes on vacuum tubes. What a great course that
This finally dawned on me when troubleshooting my #1 daughter's PC.
She breeds and raises Bernese Mountain Dogs.... long hair and lots of
Moving the PC from the floor to a table seems to have helped
significantly, but hair/dust buildup is always the first thing I look
Brushed off? Beware of static discharge which can damage something
without even knowing it. I always wear anti static strap on my wrist
and I'd not brush anything, just vacuum or use compressed air
spray can. If board is taken out, I put it on anti static mat
which is connected to wrist strap. My old habit.
I've read that where sensitive ICs are produced, tabletops and carpets
must be slightly conductive. If a circuit is on the table, a charge
could come from friction with the table or friction with moving air.
It takes a special vacuum cleaner because moving air can put a charge on
I quit using static straps. I figured they weren't foolproof enough for
a fool like me. I avoid opening a case if the humidity is below 60%. I
lay a cotton cloth on my work surface and spray it enough that it feels
damp. The assembly, anything I remove, anything I intend to install, any
tools I will use, and an arm or elbow, stay on that damp cloth.
I don't trust moving air. I use a natural-fiber brush. I dampen it
first so it's slightly limp.
Kind of like working with black gunpowder.
Doctor: You have the most advanced case of tennis elbow I've ever seen.
Patient: I'm a working man. I have never played a game of tennis in my
Doctor: What do you do for a living?
Patient: I work in a carpet store, demonstrating rug beaters.
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