Date   : Thu, 30 Apr 2009 20:28:48 +0100
From   : zeem.uk@... (Alex Taylor)
Subject: Microvitec Cub Monitor Adjustments

2009/4/30 Mark Haysman <jumbos.bazzar@...>:

> Adjusting the convergance is not for the faint-hearted! But as long as you
> mark your starting point, you can always go back to it. At the rear of the
> tube, between the base board and the yolk are a set of 6 rings, in 3 groups
> of 2. The front 2 adjust the purity,and the other 4 adjust the convergance.
> You need to loosen off the clamp in order to move them.

The rings adjust the static convergence. The dynamic convergence is
adjusted with the (highly technical) rubber wedges that hold the yoke
assembly in place. You'll see them glued between the yoke and the
tube.

I had some 1431s with very poor convergence at the edges of the
screen, and decided to do them as a learning exercise, and because
they were very clean, hardly used models made in the early 90s. The
procedure is to adjust the convergence rings until everything's
correct in the centre of the screen. Then the rubber wedges can be
removed, adjusted and glued back in place to sort out the convergence
at the screen edges.

I got some of them sorted very quickly, and some of them nearly went
out the window. Trying to re-use old wedges without the right kind of
glue didn't help, because they moved before the glue dried. I think
the original convergence problems were caused by the original wedges
hardening, shrinking and cracking, allowing the yoke to move slightly.

It's worth a go if you've got the patience!

-- 
Alex Taylor