Re: AppleColor Composite Monitor and IIGS

[mjmahon@aol.com (Michael J. Mahon)]

Matthew Styles wrote:

>I opened it up today, and found some different knobs, including focus. There
>was a group of these on the main (analogue?) board. Can one of these be
>adjusted or is there a service source article or similar that will tell me
>what to do?

and earlier:

>>> Also, the screen seems to disappear below the bottom, like
>>> the vertical position needs to be adjusted, is there a way to change this
>>> (possible an internal vertical adjustment knob)?

The vertical (and horizontal) positioning on most monitors is not a
potentiometer control, but a pair of circular magnets near the front
of the deflection yoke, with tabs protruding.  These tabs are used
to rotate the two ring magnets to adjust the magnitude (cancelling
or reinforcing) and direction (azimuthal position) of the resultant
positioning magnetic field.

They are often fixed with a dab of paint, but can be carefully freed
and rotated to produce the correct alignment.

FWIW, the adjustment seldom needs to be changed, so you might
first check the vertical size and linearity controls to make sure that
they aren't the problem, rather than centering.

-michael

 Email:  mjmahon@aol.com
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