Re: The incredible shrinking monchrome image.

[Craig Lanning <CLanning@pdesds1.atg.trc.scra.org>]

    Date: Wed, 18 Nov 1992 10:54 EST
    From: moon@cambridge.apple.com (David A. Moon)

    > Date: Wed, 18 Nov 1992 08:28-0000
    > From: Dave Stroud <Dave@AVON.sltd.dialnet.symbolics.com>
    > .... You must not work with the power on when
    > doing this adjustment; there are voltages in excess of 20kV D.C.
    > waiting to bite!

    I wish you had mentioned that the high voltage does not necessarily go away 
    instantly when the power is turned off.  I'm not sure how long one has to wait 
    to be safe on different models of monitor.  I would say that no one should 
    open up the case unless they know how to accept a 20 kV shock and live through 
    it.

    SO DON'T TRY THIS AT HOME, KIDS!

According to a TV repairman that I know, the anode voltage can linger
for several months after power is removed (the picture tube acts like a
very large capacitor).  Usually when someone is going to work on a
picture tube, they ground the anode somehow.

NOTE:  PROCEED WITH EXTREME CAUTION!!!
       Putting a large screw driver across the ANODE and GROUND has been
       known to weld the screw driver to the two terminals!!!

Craig Lanning <CLanning@trc.scra.org>
Grumman Data Systems
North Charleston, SC