Re: monitor degaussing

Mark,
I have never heard anyone suggest that a monitor/tv should be off before
attempting to degauss it, before I read it here. As a matter of fact, in
my opinion you need to have it ON so that you can see if there is a
"stubborn" area that requires more attention. On your question about why
certain tv's/monitors are more prone to having their purity disturbed
when moving them , there a number of reasons. The most important are the
tube size and it's proximity to other magnetic fields and the earth's
magnetic field itself!.
In very large TV's, such as a 31" or larger an additional coil is often
added to the tube to correct for the earths magnetic field. Some of
those Tv's have a switch that sets the position of the TV (North-South)
etc
A lot of times if you just pickup a TV or monitor and flip it on it's
side to work on it the purity will be messed up but flipping it back
corrects it.
As for your monitor in your van, though it's orientation changes my
guess is it's a small screen size hence less effected and probably once
degaussed by it's internal degaussing coil and left in a fixed position
that the metal of the van acts like a shield and stabilizes it further.
I can tell you a lot of the portable tv's made to run in cars/vans
(12v/ac) were equipped with a button on the back to manually activate
the degaussing coil!, so the manufactures thought it was a big problem.

Steve

Mark E Davidson wrote:

> This brings up an interesting question I had the past 5000 miles to
> ponder as I have just returned from a "drive all over the planet"
> vacation. My conversion van has a standard "tube" monitor in it...
> How, come I can drive all over creation with it, and never have a
> degaussing problem, but when I move an arcade game across the room it
> becomes a mess? What is different in a newer TV vs a newer monitor (be
> it vector or raster)
>
> And why degauss off? My electronics teacher taught us to do it on
>
> -=Mark=-
>
> Rodger Boots wrote:
>
>> Bret Pehrson wrote:
>>
>> >> also what the best procedure is. What I saw him do was a
>> >> circular motion gradually backing away from the machine.
>> >>
>> > Yep, that's it -- back away about 6 feet if you can.
>> >
>> > Do the procedure w/ the monitor OFF.
>> >
>>
>> Monitor off doesn't matter too much (after all the built-in degauss
>> obviously runs with the monitor on). It's way more fun to degauss
>> with the monitor on.
>>
>> Doesn't matter if there are a lot of games in the room as long as
>> you can get over 6 feet from all of them when you turn off the
>> coil. If you can't get that far back another option is to plug the
>> coil into a Variac (variable transformer) and slowly turn down the
>> power (no less than 5 seconds from full to off).
>>
>> UNPLUG THE COIL WHEN NOT USING IT! Most coils have momentary
>> switches, but I've seen some that could be left on. A coil left on
>> will get seriously hot and self destruct, possibly causing a fire.
>>
>> I never really thought about it before, but degaussing a game that
>> uses tape cartridges for sound, tape for the program (the old Deco
>> cassette system), or hard drives or floppy drives could be seriously
>> damaged by a powerful degaussing. The built-in degaussing isn't a
>> threat (not that strong and doesn't wander around the room).
>>
>> Also, take off your watch, especially modern watches with analog
>> faces. One tech at my Real Job always had to reset his after a
>> degauss because the hands would spin at high speed when the coil was
>> on.
>>
>>
>>
>> > Also, I've had a case or two where the monitor metal frame had
>> > become
>> > magnetized. In this case, I 'degaussed' the sides of the frame,
>> > then
>> > degaussed the CRT using the normal procedure.
>> >
>> >
>> >
>> >> -----Original Message-----
>> >> From: owner-vectorlist@vectorlist.org
>> >> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Mike
>> >> Ellingson
>> >> Sent: Tuesday, August 12, 2003 5:19 PM
>> >> To: vectorlist@vectorlist.org
>> >> Subject: VECTOR: monitor degaussing
>> >>
>> >>
>> >> Thanks for all the advice. I have seen this done when I
>> >> picked up my very first machine from an op. He had it in the
>> >> middle of the room, but I have 13 machines crammed into my
>> >> basement and was wondering if they should be isolated and
>> >> also what the best procedure is. What I saw him do was a
>> >> circular motion gradually backing away from the machine.
>> >> Thanks again, Mike
>> >>
>> >>
>> >
>> >

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Received on Fri Aug 15 12:04:22 2003