From: maclean@cs.mcgill.ca (Matthew SAMS)
Subject: Colour monitor power supply problems
Originator: maclean@opus.cs.mcgill.ca
Keywords: monitor color power supply
Organization: SOCS, McGill University, Montreal, Canada
Distribution: na
Date: Wed, 12 Aug 1992 16:31:21 GMT

Hello,

	The letter at the end of this posting was sent to sun-managers.
It describes a problem encountered with the power supplies on colour
monitors.  The one caveat is that these power supplies are different
from the ones in N.A. (the problem occurred in Europe, 240V)

To paraphrase:  when there is an abrupt brightness surge due to the
opening of a large white window the power supply on the monitor may
die.  I assume they had a black background when they opened this
window.  
	My question:  has anyone in N.A. had similar problems?  We
have several of these monitors and we're considering putting them
on a service contract.


			Thank you
			Matthew
*********************************************************************
|                                                                   |
|Matthew Sams			School of Computer Science          |
|maclean@cs.mcgill.ca		McGill University                   |
|514 398-7083			Montreal, Canada                    |
|                                                                   |
*********************************************************************

>Date: Wed, 12 Aug 92 10:33:34 BST
>To: sun-managers@eucad.co.uk
>From: alastair@eucad.co.uk
>
>I got this from one of my users today. It sounds unlikely, but has this 
>happened to anyone else? Could a power surge caused by sudden brightness
>increase on the screen cause the power supply to trip?
>
>The systems in question are SparcStation 1+, big colour monitor and the
>power 
>is at 240V, 50Hz.
       ^^^^^^^^^^
>
>>Date: Wed, 12 Aug 92 10:14:27 BST
>>From: k* (James K*)
>>To: alastair
>>Subject: Wierd Sun Bug?
>>
>>Hi Alastair,
>>
>>Do you remember that about a month ago I had the problem with my machine
>>going "pop", and the screen going dead? We called out a Sun engineer, and he
>>changed the power supply.
>>
>>I have had this problem again twice recently, and Colin H* has had exactly
>>the same on his machine yesterday. I only get the problem when I zoom in close
>>on a FrameMaker document and pan around. Colin had the problem when he was
>>running one of his programs that opens a large window (I think). In both cases,
>>the problem occurs when the amount of "white" on the screen suddenly increases.
>>I guess that this is probably coincidence, but you never know, I suppose. I
>>think that we were both running Open Windows 2.
>>
>>	Cheers,
>>		James.
>
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>Alastair Young     Systems Supervisor (SMTS)      _       _        Ariel NH
>European CAD Developments Limited  aka EuCAD    )/___    (_)     Red Hunter
>EuCAD/Cadence mail: alastair +44-31-225-3434  __/(___)_*##/c    "Aspencade"
>Full Email Address:     alastair@eucad.co.uk / /\\|| \ /  \     If in doubt
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