Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!randvax!edhall
From: edhall@rand.org (Ed Hall)
Newsgroups: sci.electronics
Subject: Re: sort of fixed monitor
Message-ID: <1990Nov7.230205.2520@rand.org>
Date: 7 Nov 90 23:02:05 GMT
References: <1990Nov6.233222.8908@nntp-server.caltech.edu> <2262@exodus.Eng.Sun.COM>
Sender: news@rand.org
Reply-To: edhall@rand.org (Ed Hall)
Organization: The RAND Corporation, Santa Monica, CA
Lines: 21

In article <2262@exodus.Eng.Sun.COM> bender@oobleck.Eng.Sun.COM (Michael Bender) writes:
>In article <1990Nov6.233222.8908@nntp-server.caltech.edu> gwoho@nntp-server.caltech.edu (g liu) writes:
>> . . . .
>>this is wat it was for: when the computer is turned on, the resistor
>>is cold, so it lets lots of current go through a coil that is in front
>>of the crt. after 1 sec, it gets hot, and the current shrinks, and it
>>demagnitizes the metal chunks around the crt.
>I can't help with the scratch, but for the resistor, you could try
>substituting a momentary push button switch, optionally with a fixed-value
>resistor in series with the switch if the miniumum reistance of the original
>resistor was much greater than a few ohms.

Don't do this!  There is a reason why they used that particular mechanism.
The current through the coil must be reduced *gradually* or else it might
wind up making matters worse (i.e. instead of a DEmagnetizer it would
become a magnetizer.)  It shouldn't be too hard to find a replacement
thermistor; just about all high-quality CRT's (and even TV sets) use
a similar mechanism.

		-Ed Hall
		edhall@rand.org