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PRECAUTIONS
CHOOSE
A LEVEL
LOCATION
If the
unit
is not
level
various
performance
problems
will occur,
so pay careful attention to
this point.
DO NOT PRESS
ON THE PLATTER
Pressing on the turntable platter, especially during
play, can damage
the mechanism.
ALWAYS
CLEAN
THE
STYLUS
e If the stylus is dirty sound quality will deterio-
rate; brush it off with a soft brush from time to
time.
e@ if the record
surface
is dirty, clean
it with a
record cleaner before
playing.
e@ It is preferable
to make
it a babit to clean a
record
surface before
each play.
@ Touching the stylus with a finger is a common
cause of stylus damage, so be very careful when
handling
the tonearm
and
when
cleaning.
NO
VIBRATIONS
The tracking force of your stylus will probably be
extremely
light, so it is important
to place the
unit in a location protected from vibrations. This is
another reason why it should not be too close to
the speakers.
DO
NOT
OPEN
THE
SET OR
TOUCH
THE
INSIDE
PARTS
Your PL-51
is assembled with a number of small
and
delicate
components
into
one _ precision
mechanism which should not be touched. There is
no reason to open the unit or remove the turntable
once
assembly
is complete.
FOR
FINE
SPEED
ADJUSTMENTS
To make proper adjustment, check the stroboscope
in fluorescent
or other electric bulb light. Avoid
making use
of sunlight.
10
TROUBLESHOOTING
HOWLING
'"Howling"' is acoustical feedback from speakers to
the turntable unit. Increasing the distance between
the
speakers
and
the
turntable,
or even
better,
laying
a soft cushion
under
the turntable
will
eliminate
howling.
HUM
"Hum"
is a low-pitch droning noise, often 60 or
50Hz,
resulting from
a loose connection
of the
ground lead. If hum
occurs:
@ Check the connection of the PL-51 ground lead
(the black lead with a split lug) to your amplifier.
If it is loose,
connect
it.
® Check if the output lead of the PL-51 is running
near
the power transformer
of your amplifier.
Changing the position of the PL-51 in relation
to the amplifier will often eliminate hum.
This
unit
is factory-set
for AC
120V
operation
when
shipped.
If the house current in your area is not in 120V,
please
contact
your
Pioneer
dealer
in order to
re-adjust the 120V
unit for 110V, 130V, 220V
and 240V
operation.
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