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PION€EIT
HINTS
FOR
OPERATING
CD-4
DISC
RECORDS
TURNTABLE
The CD-4 disc record
is
engraved
by
high
frequency
signals based
on
a
30kHz carrier, which
extends
up
to
45kHz. Compared to conventional 2-channel disc records,
the
recording level
is low.
Therefore,
it
is
desirable to
take note
of
the following
suggestions
connecting
the
CD-4 disc
record reproduction tumtable.
o
The PHONO MOTOR must operate almost without
vibrations, revolve
at
constant
rotational
speed
with-
out
wow
and
flutter,
and produce an excellent
signal-
to-noise
ratio.
.
The TONEARM must
have
sufficient trackability, that
is, can track the groove
with light
tracking force. Also
it
must have an anti-skating device and lateral
balance
to
adjust the tonearm so
that the
tracking force
can
be distributed equally
to
both the left
and
right
walls
of the record
groove.
PHONO CARTRIDGE
To
effectively reproduce the wide frequency range of
CD-4 records over a long period,
it
is essential
for
CD-4
disc
record reproduction to
use an
exclusive cartridge.
Make certain
that the
stylus
is
in
position when
the
phono
cartridge
is
installed, and
that the
stylus
goes
down vertically
onto the
record surface when the phono
cartridge
is
replaced, so
that
separation and sound
quality
remain
the
same
as
before.
RECORD HANDLING
Since
the
groove
of
the
CD-4 disc record
is
delicately
engraved, even
a
small amount
of
dust can
cause un-
pleasant noise
and poor sound quality.
In
addition,
it
can scratch the record surface, reducing
its
service
life.
Since
the
warped disc
record
is
never
reproduced exactly,
it
is
desirable
to
exercise
utmost
care
in
handling them.
Before and after playing the disc,
it
should be
cleaned
with high quality
cleaner,
not
a
spray-type.
It
must
not
be washed
with
water.
STYLUS CLEANING
If
dust
clings
to
the stylus, sound quality
and separation
become
poor, 4-channel stereo
is
impossible
to
reproduce,
and
the disc
is damaged.
The stylus must always be
cleaned whenever a record
playing is over.
If
dust is
difficult to
remove, clean
care-
fully
with commercial
available
alcohol stylus
cleaner.
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