Hitachi PS-48 - Turntable Controls and Adjustments; Preventing Howling and Induction Hum; Overhang Adjustment Procedure

CONTROLS
* Howling
Cartridges
are
very
sensitive
and
may
pick
up
slight
sound
pressure
or
vibrations
of
the
speaker
coming
along
the
floor
or
through
the
air
—
resulting
in
howling.
Therefore,
the
location
of
your
turntable
is
very
important.
Find
a
location
which
is
very
stable and free from vibration.
* Induction Hum
Your
turntable
utilizes
a
brushless
DC
servo
motor
to
reduce
inductive
hum.
If
annoying
inductive
hum
is
heard,
it
can
be
caused
by
the
electromagnetic
field
produced
from
the
motors
or
transformers
used
in
another
device.
Do
not
place
the
turntable
near
a
device
in
which
a
motor
or
transformer
is
used.
To
prevent
the
turntable
from
being
affected
by
the
power
transformer
of
your
amplifier,
receiver
or
tape
deck,
position
the
turntable
on
the
opposite
side
of
the
power
transformer.
* Overhang adjustment
Adjust
the
overhang
when
the
cartridge
is
attached.
—
Overhang
is
best
when
the
distance
between
the
center
of
the
platter
and
the
stylus
tip
of
the
cart-
ridge
is
shortest,
and
this
length
is
determined
by
the
tone
arm
—
In
case
of
PS-48,
overhang
of
the
tone
arm
is
15mm.
Adjust
it
by
moving
the
cartridge
back
and
forth
after
loosening
the
cartridge
fixing
screw.
Tighten
the
cartridge
fixing
screw
after
adjustment
is
completed.
Overhang
Center. of
platter
* Removal of Dust Cover
The dust cover is designed for easy removal. When
the turntable is to be used without the dust cover,
remove it as follows:
Open the dust cover.
Slide the cover carefully in the direction of the
arrow (f) as shown in Fig. 2, then pull it in the
direction of the arrow @).
To replace the cover, simply follow the above
instructions in the reverse order.
NEON LAMP CASE
Since
operation
of
the
servo-amp.
is
unstable
for
approx.
30
sec.
after
power
is
switched
on
perform
pitch
control
approx.
30
sec.
after
the
platter
starts
revolving.