Degaussing a 1084s

Hell_Labs

New member
Banned
Joined
Mar 27, 2010
Posts
674
Country
England
Region
St.Helens, Lancashire
Hi. Just got a 1084, and the colour is waaay out, looks like it was sat near a magnet for a while. Does anyone know how to degauss this sucker?
 

Revival9001

Member
AmiBayer
Joined
Aug 31, 2009
Posts
44
Country
UK
Region
Scotland
Hi. Just got a 1084, and the colour is waaay out, looks like it was sat near a magnet for a while. Does anyone know how to degauss this sucker?

I had success with two powerful magnets attached to a power drill, then slowly moving into the direction and away from the screen, but I can't guarantee that this is very safe.

Another solution is to take a monitor that does have a degauss feature, place it with the 1084s, and use it's deguass function, the electromagnets may reach the 1084 too.
 
Last edited:

r0jaws

Mondeo Man
Joined
Jan 23, 2008
Posts
7,237
Country
UK
Region
Lincolnshire
I used to have a 1084s d1, I'm sure there was a degauss button on it somewhere.
 

Xanxi

Well-known member
AmiBayer
Blogger
Joined
Jun 10, 2010
Posts
2,368
Country
France
Region
Paris
I'm pretty sure there is no degauss on all the 108x series.
Maybe you can get a defective one to rejuvenate this one.
 

skippy

New member
Joined
Jun 3, 2008
Posts
106
Country
BRISTOL, UK
Region
Avon
The 1084 *does* have a degauss. There is a posistor [2322 662 98018] located at [R104] on the SMPS unit.

If you believe it *not* to be degaussing and intend to fault-find this is where you should start.

** Remember electricity KILLS. **

If you could post a photo of the affected 1084 monitor this would prove useful for determining exactly what is wrong with your screen before you proceed.

If you believe that it *has* been damaged by a speaker magnetic, degaussing will *not* necessarily fix this because the shadow mask NOW has an additional, possibly permanent, "magnetised" field in that affected area which is usually "stronger" than the CRT's own field. (Then you need a professional external device to do the job correctly.)

** The concept of degaussing is to randomised the entire field of the shadow mask preventing localised discoloration **

Many folk seem to get confused with the role of the degauss believing it is suppose to remove any magnetism; it doesn't. (requires more detailed explanation.)

I wouldn't explore the "magnet on a drill" nor "swap out just any degauss coil", it's crude.

CRTs are magnetically conditioned at the factory; this can include hemisphere orientation.

Any "manual" degaussing if done incorrectly will destroy the conditioning AND the purity of your CRT.

** Do not switch your 1084 on/ off repeatedly in an attempt to degauss the screen over n' over, the rapid succession of high current
may kill your coil/SMPS. **


Shifting:

* One method you made wish to explore with permanent damage or severe purity issues is placement of a disc magnetic of equal strength (generally fridge magnetic strength) but
opposite field orientation to "shift" the magnetism "away" from shadow mask; but this can be quite tricky. (see attached photo.)


** A common example of *dependency* of magnets to correct a CRT is the classic case of hifi speakers that have been either side of a CRT for so long that actually removing them causes the problem because of how the tube environment has changed over time.
In other words the speakers need to remain!

You also need to keep in mind your shadow mask is an precision engineered perforated sheet of metal. Whacking a strong magnetic against
it could potentially warp it leaving you with a bigger problem of mal-alignment to the in-line electron beams converging on the phosphor.

Paul.

*Edit*
There's some useful information in the C= 1084 Service Manual available online as.pdf regarding static/dynamic convergence, B&W tracking, Colour purity, Degauss coil.
 

Attachments

  • puritytv.jpg
    puritytv.jpg
    29.6 KB · Views: 3
Last edited:

Station240

New member
AmiBayer
Joined
Feb 15, 2010
Posts
307
Country
Adelaide,Australia
Region
South Australia
TV techs have a wand type device to degauss TV tubes, its almost a 5 minute job to solve. So maybe ask your local TV/everything repair shop if they can do it while you wait. Oh and take something that can drive the monitor, odds are they don't have anything.
 

FOL

Active member
Joined
Apr 21, 2008
Posts
1,077
Country
United Kingdom
Region
Wales
TV techs have a wand type device to degauss TV tubes, its almost a 5 minute job to solve. So maybe ask your local TV/everything repair shop if they can do it while you wait. Oh and take something that can drive the monitor, odds are they don't have anything.

Aye, brings back memories. Aint heard the words for almost two years now.

Degauss Wand.

It was a powered magnet, that when activated would pull the screens shadow mask, and straighten it. This would solve the problem.
 

Hell_Labs

New member
Banned
Joined
Mar 27, 2010
Posts
674
Country
England
Region
St.Helens, Lancashire
Thanks for the help everyone.


TV techs have a wand type device to degauss TV tubes, its almost a 5 minute job to solve. So maybe ask your local TV/everything repair shop if they can do it while you wait. Oh and take something that can drive the monitor, odds are they don't have anything.

If they don't have something that outputs composite video I'd be very surprised. Worth a go though. I'll get a picture up later if my camera decides to work. It's mostly just a bit of blue in the corners.
 
Top Bottom