Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!decvax!duke!unc!mcnc!unc-c!dya
From: dya@unc-c.UUCP
Newsgroups: net.micro
Subject: Re: p39 monitor for Scion graphics board.
Message-ID: <1161@unc-c.UUCP>
Date: Fri, 18-Nov-83 09:49:13 EST
Article-I.D.: unc-c.1161
Posted: Fri Nov 18 09:49:13 1983
Date-Received: Tue, 22-Nov-83 00:52:02 EST
Lines: 24

References: mit-eddi.925


	The recommended procedure for this is to DISCHARGE the offending
high voltage anode in question with a 1.0 megohm, 10 watt resistor connected
to THE SAME GROUND THAT THE CONDUCTIVE COATING ON THE FUNNEL OF THE CRT IS !
(Most monitors have a nasty little warning like "Arc or meter H.T. to -----"
Otherwise, the resulting high voltage will most definitely wipe out even
the best CMOS and bipolar transistors which happen to be near the path of
least resistance.
	In addition, you MUST wear 1)FULL FACE SHIELD and 2)HEAVY CLOTHING
at any time a cathode ray tube is exposed.  Although personally, I have
broken a number of these insturments (once by sitting on an exposed neck
inadvertently !) with no ill effects, there are documented cases of
implosion which have maimed.
	Also, a continuity check of ALL RELEVANT SURFACES must be made
with respect to the AC mains in accordance with UL practises.

        Then there is the X-radiation problem. YOU MUST REPLACE THE TUBE
WITH A TYPE THAT AFFORDS EQUIVALENT X RADIATION PROTECTION !!!!!

{ when the HV is over 12 kV }

--David {...duke!mcnc!unc-c!urp!dya  }