Path: utzoo!attcan!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!cwjcc!neoucom!wtm
From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: comp.sys.amiga
Subject: Re: 1084s goes poof. Film at 11.
Summary: Danger Will Robinson!
Message-ID: <1397@neoucom.UUCP>
Date: 5 Nov 88 21:19:10 GMT
References: <8097@gryphon.CTS.COM> <106@cs-spool.calgary.UUCP> <1059@cseg.uucp>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 29


The CRT anode voltage is dangerous.  What is even more dangerous
about the high voltage than the shock hazard is that it can induce
involuntary muscle contraction.  That is to say that your arm (or
whatever) could flinch violently causing a rupture of the the CRT
neck.  The resultant flying glass shards are what might do you in.

What poses the greatest risk of electrocution are the intermediate
voltages in the display unit.  It is quite likely that voltages of
approximately 100 - 200 volts are present.  These supplys are
capable of delivering substantial current for prolonged periods.

As you can see, there are several hazards within a video display
unit.  If you don't know EXACTLY what you are doing, any tinkering
should definitely be left to a trained technician.

Note that special non-conductive sprays are used to seal where the
anode lead cup attaches to the CRT neck.  Disturbing the seal to
discharge the anode lead for servicing requires that a fresh coat
of sealant be applied when you are done.  The sealant is available
as spray or paint called corona dope.  It is available at TV
service supply stores.

Discharging the anode lead to the wrong place on the display unit's
chassis can dmamge circuitry.  I strongly recommend following the
advice on any labels inside the case or the manufacturer's service
book.

--Bill