freebsd-questions Digest, Vol 654, Issue 6

Dale Scott dalescott at
Sat Dec 17 17:19:22 UTC 2016

Blow canned air into a hot paper shredder and you'll get some real excitement! (Kaboom!). That's when I read the can and learned it's not really air. 

> On Dec 17, 2016, at 5:07 AM, Dave B via freebsd-questions <freebsd-questions at> wrote:
>> On 16/12/16 14:21, Tim Daneliuk wrote:
>>> On 12/16/2016 08:14 AM, Dave B via freebsd-questions wrote:
>>> Check the health of the cooling systems in your notebook.
>> This. Like I most of us, I am the "IT Repair Department" for friends and
>> family.  You have no idea how many computers I have "fixed" simply by
>> blowing the dust out of the cooling path and off the motherboards.
>> Mac laptops, especially, seem to be built to very tight cooling tolerances.
>> Recommend taking the unit apart and then going outside to blow the dust
>> out of the guts of thing.  Never use a vacuum cleaner to do this because -
>> unless specifically designed for electronics - vacuum cleaners will generate
>> a lot of static electricity which is deadly to solid state parts.
> Even using an air-duster-in-a-tin can create static charges.  (Any air
> movement over a surface can.)  But in practice, it's not a problem is
> used sensibly, within a largely complete PC, or on a laptop exposed but
> not dismantled main board.   (individual assemblies, RAM sticks and
> such, then the static can do damage, but much less so, when they are
> installed in a socket.)
> More a problem, is that it is sometimes possible to blow dust into the
> internals of fan motors and cause problems, but even that is rare.  Try
> not to let fan's spin too fast either.  Some can generate quite a bit of
> voltage, and that could do something as it finds it's way back into the
> machine.
> I'm always amazed at the amount of otherwise good hardware that is
> chucked away, just for the want of a bit of maintenance.  UPS's are a
> prime example, a good clean out and new batteries, and often they are as
> good as new.
> Seasons Greetings etc.
> Dave B.
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