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91
FOCUS RADIAL
MDTDR
MOTOR
44
411
8
Checking the angle setting
Put glass disc 4822 395 90204
on
the turntable.
Make sure that the glass disc beds
down
well
on
the
turntable.
The angle setting can be checked with the glass-disc
method which
is
explained below.
~
Fig. 5
es
20
059
Place the CD mechanism under a light source, under
which there is a straight line (e.g. under a fluorescent
tube with grid).
Set the
arm
to
mid-position
of
its radial track.
Turn the mechanism until the
arm
is parallel to the line
under the light source (see figure below).
Look
into the direction and
in
the extension
of
the line
to
the reflection there
of
on
the glass disc and in the
objective.
Locate the CDM
in
such a way that the line reflected by
the glass disc runs across the centre of the objective.
The line reflected by the objective should fall
just
within
the surface
of
the objective.
lf
this
is
the case, the
two
lines are
not
more than 4 mm apart and squareness
is
correct.
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