Sionnach Aisling wrote:
>
> He definately shouldn't use that tool to discharge a
> CRT, but what I haven't seen anyone mention is that I
> don't believe he needs to.
i never do unless i'm planning on working on the analog board or having
it open for a long time or taking it apart for cleaning. the second
anode lead should not pop off by itself, though it's possible if you
yank on it.
> He said he had a SE/30. Isn't the SE/30 setup to
> discharge itself on power down? Somewhere in the back
> of my mind, I think I remember someone saying this.
not sure, most monitors are. however, a prudent tech never, never
counts on that, bleed resistors can and do fail, and not every monitor
has them.
> Nonetheless, before cracking mine apart to add RAM and
> a NIC card, I let it sit for two days unplugged,
> avoided the back of the CRT, and had no problems...
that's not going to help if the bleed resistor fails, i've worked on a
tv (actually several) that didn't have bleed resistors (i think it was
rca that was bad about that for awhile, but it could have been another
brand, in any case, tv's of some brands from a certain time span never
have bleed resistors!), it had been in the shop for good month without
being plugged in, when i shorted the second anode to ground it still
gave a fully fearsome snap. picture tubes are really great little high
voltage capacitors, without a working bleed resistor they can hold a
charge for a surprisingly long time.
best plan is to just stay away from the big red wire if possible.
besides, on a b/w compact mac it's not terribly dangerous any way, but
of course some people are more sensitive to shock than others. you
shouldn't deliberately zap yourself, and if you happen to be one of the
more sensitive people it could still be a problem, it's just not
terribly likely to be.
--
"Security is mostly a superstition. It does not exist in nature, nor do
the children of men as a whole experience it. Avoiding danger is no
safer in the long run than outright exposure. Life is either a daring
adventure, or nothing."
- Helen Keller, American Blind/Deaf Author & Lecturer...
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