Re: Apple //c monitor - tilted?!

["Frank Townsend" <ftownsen@nospam.net>]

"Michael J. Mahon" <mjmahon@aol.com> wrote in message
20040804060334.14909.00000812@mb-m10.aol.com">news:20040804060334.14909.00000812@mb-m10.aol.com...
> Richard Kilpatrick wrote:
>
> >On 4/8/04 2:15 am, in article cepdm101ske@news2.newsguy.com, "David Chiu"
> ><none@nowhere.org> wrote:
> >
> >> You need to pop the casing and adjust the yoke... Not for the light
> >hearted.
> >> Monochrome monitor doesn't quite use as high of voltage as colour ones,
but
> >it
> >> will still give you quite a shock. My suggestion is to leave it to
places
> >like
> >> TV repair shops that knows what they're doing than to venture inside of
a
> >> monitor.
> >
> >Yep - I'd suspected it was a yoke issue, but I Don't Like To Mess.
> >Especially since getting that bit wrong can result not only in people
> >jumping about uncontrollably and getting burns, but also, you can crack
the
> >neck of the tube if you get it wrong.
>
.. snip..


> The procedure is quite simple in practice, and was done regularly
> by hundreds of thousands of people working on their own TVs in
> the 1950s and 1960s.
>
> A CRT is probably one of the strongest pieces of glass you will
> ever find.  The danger of implosion is played up to keep people
> from taking a wrench to the neck of the CRT.  ;-)  Actually, the
> biggest danger is having someone with a heavy metal tool near
> the neck of the CRT come in contact with the undischarged
> anode, producing a rapid, uncontrolled movement of the tool.
>

.. snip ..


Since currents as low as 60 mA can induce ventricular fibrillation and
cardiac arrest, this also becomes a significant risk if one is unlucky
enough to touch things such that the heart is in the current pathway.

The risk of death also changes with skin resistance, so that sometimes you
get away with it:  dry, intact calloused palms have a resistance of
1,000,000 to 2,000,000 ?/cm2, while sweaty skin resistance may go down to
2500 ?/cm2.  At 10,000 volts with dry hands you can survive with just a
tingle, while nervously sweating can leave you dead on the floor.


Frank