Monitor deflection magnets; what to do when one falls out & breaks?

From: Brad Parker <brad_at_heeltoe.com>
Date: Thu Jul 15 10:54:51 2004

Paul Koning wrote:
>
>It's probably not a magnet, but rather a ferrite core. You'd know the
>difference putting the pieces together -- if you feel no attraction or
>repulsion, it's not a permanent magnet.

Interesting. The pieces do attract.

Are ferrite cores magnetic?

(I would think a ferrite core would have wires wrapped around it)

These magnets are not connected to the wired internal yoke assembly -
they are glued to a "collar" which is close to the back of the tube.
The collar is round but the magnets are glued to make a square - I
assume this helps make the image square. (or not :-)

The magnets on the two sides are symmetric as are the top and bottom.
Both top and sides have two "tube magnets" but ared spaced slightly
differently. The sides have two magnets side by side with no gap.
The top and bottom have two magnets side by side with a a 1/4" gap.

I can see where the glue was holding the magnet. That's where I put it
back.

I assume the poles should be aligned, i.e. the poles of the two magnets should
be the same, producing a larger overall field (I presume)

>As for the problem, I wonder if the issue is that the core is in the
>wrong spot. It's part of the deflection magnetics assembly, and if
>it's misplaced then you'd certainly get problems like you describe.
>Take a look at the corresponding piece at the bottom of the yoke. I
>would expect things to be symmetric. The fact that the thing fell out
>suggests that it may have been out of position, and when you pushed it
>back in you may not have gotten it back where it actually belongs.

Well, it fell out onto the floor when I took the enclosure off :-)

-brad
Received on Thu Jul 15 2004 - 10:54:51 BST