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MECHANICAL MEASUREMENTS AND ADJUSTMENTS
Height setting of the turntable
For this alignment the unit should be in the position of
normal end use. The servicing supports 4822 395 30202 can
be used here.
Playback track 1 of disc 4822 397 30096. (Disc without
defects).
Connect a D.C. voltmeter between the negative of the focus
motor and earth of the preamplifier print.
Adjust the height of the turntable with bearing screw 51 in
such a way, that the voltage is 0 V +/—
100 mV. Seal
hereafter the screw with sealing paint.
Checking the angle setting
=
6 a
DISC.
(TRANSPARENTH.
30 707 AIS
Place mirror 4822 395 90205 on the objective and glass
disc 4822 395 90204 (with disc hold-down 4822 532 60906)
on the turntable.
SS
on
|
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ue —_—
DISC (TRANSPARENT)
30 708 At5
Rotate the CD mechanism through 90° relative to the
previous position.
The arm must be kept in mid-position (see Fig.).
Adjusting the angle setting
With respect to the adjustment of the angle between disc
and light path, the factory has looked for a compromise
between
minimum
angle deviation and minimum
arm
friction.
After
adjustment,
the friction
of the arm
should
be
checked.
This is done by means
of a spring-pressure
gauge which
is connected
to the counterweight.
The
friction of the arm, measured
over the total scanning
deflection, is not allowed to exceed 30 mN.
Adjustment of the angle is performed as follows:
Place the set on the servicing supports 4822 395 30202.
a
30709 A15
Loosen screws C (see Fig.) until bearing plate D can be
shifted.
Correct the angle setting by shifting the bearing plate in
the direction indicated on the Figure.
Tighten screws C ensuring that the setting does not drift.
Double check the angle setting in two directions.
Attention
After setting the angle, the height setting of the turntable
should be checked.
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