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

From: Brad Parker <brad_at_heeltoe.com>
Date: Thu Jul 15 09:09:47 2004

Hi,

I have an old B&W "specialty" monitor which recently stopped working.
In the process of moving it around (to/from repair place) I noticed a
little black "tube magnet" dropping out when I took the cover off.

At the time I didn't think much of it (those in the know can chuckle now).

So, after a bout of replacing bad caps with no luck, I eventually broke
down and replaced the deflection board and the monitor sprang to life.

Much joy.

(note: "specialty" = designed for a specific computer with a special ECL
video connection and has no standard connector or interface. and no
schematics)

So, monitor is working. I proceed to adjust the H & V size, linearity, etc...

I notice that the bottom and sides will square up nicely but the top
edge has a large "dip" in the middle. No amount of trimmer fiddling will
fix this.

light goes off. "found" tube magnet is part of yoke assembly.

So, I notice where the missing magnet came from. Naturally it's on the
top side of the yoke assembly.

But - the "tube" has broken into 3 pieces (it was broke when I found it.
honest). I carefully glued it back together (no glue in the joints,
however) and replaced it. This helped a little but did not cure the
problem.

[note to reader: I never took that fields course. I know nothing of magnets.]

So,

- is a broken magnet pushed back together not as good as a whole magnet?
(strength wise)

- can I get a new magnet somewhere?

- is there anything special about these magnets?

- do normal monitor repair guys just have a box of these laying around?

- does this sort of thing happen all the time?

-brad
Received on Thu Jul 15 2004 - 09:09:47 BST