RE: monitor degaussing

The instructions that came w/ my degaussing coil recommend that the monitor
is powered off, although, like you, I have had it on when trying to degauss
a stubborn area. After that, though, I degauss it again w/ the monitor off.

-----Original Message-----
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of SteveT
Sent: Friday, August 15, 2003 9:05 AM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: 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 14:22:16 2003