The following procedure was written by Curt Palme.
This article details adjustments to the picture using the deflection yoke
The deflection yoke is the round coil of wire butted right up to the bell of
These yokes are held on with a radiator type of clamp ( hot glue in
the case of the
Marquee series of projectors), and can be loosened and turned
around the neck of
the tube. With the convergence settings at mid-position or
zeroed out, you want
the image to be square on the face of the tube.
In the rare
case that the projector is mounted off axis or is not sitting level with the
screen (not a desirable thing to do), you can rotate the yokes of the tube so
image is level on the screen .Note that in the case of some older sets,
the yokes may
have slipped position, or drifting components in the set may cause
the image to be
The image below shows what rotation of the yoke
does to the raster and image of the
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