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4.3
ALIGNMENTS
NOTES:
The
CD
player is an optomechanical precision
instru-
ment.
It
should be touched only on the aluminum
chassis
and not be exposed
to
dust.
The optlcal laser system can
be
cleaned with an airbrush.
Do
not
use any solvents,
they can penetrate
into
the
focussing mechanism and destroy
it.
The
CD
play mechanism is equipped with
self-lubricating
bearings that require no maintenance.
4.3.1
Checking the
optic~l
la5er system
-> Fig. 4.5
I
Fig. 4.6
•
S~itch
the unit off and disconnect the power cord from
the AC outlet.
• Remove the CO play mechanism <Section 2.4.1).
• Place
the
removed die-cast
play
mechanism
(without
case)
under
a
light source.
,rom the
light
source
string a piece of thread or wire in such a way that
it
~asts
a str
a
ight, th
i
n shadow on the play mechanism.
• Place
the small
mir
ror for allgning the optical
sy5te~
on the laser leos.
• Mount
the glass CD for aligning the optical system
on
the play meChanism.
• Move
the l ase.r [) i
~~up
arn to the .., i ddl e
:)os it i on
and
shift
the play mechanism in such a way that the ShadOW
of
the light source is in the center
of
the
scanning
arm and runs par
a
l
lel to tre latter.
•
~hen
you obs erve th
e
two shadow lines on the glass
CO
and on the mirror
(F
ig.
'.5).
the lateral offset should
not exceed 2.5 nm.
• Position
the
play
mechan,sm in such a way
that
the
snadow line runs perpendicular to the
s~anning
arm, but
through
t
he center of the m i r ·'()r on the opt i cal
laser
system. (Fig. 4.6)
• The lateral offset of the shadOw line should again
not
exceed 2.5 mm.
4.3.2
Correcting the optical laser system
-) Fig.
4.7
•
Chec~
the optical laser system (Section
4,}.1).
• Loosen
tWO screws [Al sufficiently
50
that the bearing
plate5 tan be Shifted, (Fig
4.7)
• Correct the position of the bearlng plate according
to
r'g,
4,7
• When
the
position
'0
correct,
carefully retighten the
screws
{Aj,
•
Rec~ec~
the
alignment
of the
optical
laser
system
(Section 4.3.1).
• Reinstall the CO play mechanism.
rig.
t..
7
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