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a hi-fi unit. These are generally
unit is faulty (a transistor or part is deteriorated)
and (2) an
external source of noise gives noise to the unit,
When a hi-fi unit produces an unpleasant noise, it is often judged
that the unit is faulty, but statistical records indicate that the
majority of noises produced in a hi-fi acoustic units result from
external
sources of noise. Due
Noise: There are a variety of noises relating to the operation of
and
divided into two types; (1) the
The
to the inherent high sensitivity
Ty
table
includes
the
conditions
that may
be mistaken
to
troubles of the unit.
Symptom
Suspected Source of Noise
Diagonosis and Remedy
_]
Continuous
or intermittent
® Statics or listening.
®@ Flourescent
lamp,
motor,
or
thermostat
may
be
used
in house
or in the vicinity
of the
house.
When a
station
in,
hum
| program %
is tuned
is mixed
in the
© Poor
fluorescent
lamp,
motor,
or electric
heater
may
be used
in house
or near the
house.
Reversing
the
tine
plug
may
occasionally
alleviate
this
noise
problem,
Usually
it is very
difficult
to eliminate
the noise.
Hissing
sound
noise in AM
(medium
wave)
reception.
When
Listening
to Broadcasts
Static noise in FM reception
(in particular,
when
auto-
mobiles
run
close
to
the
house),
Reception
of
FM _ stereo
@ The
frequency
of
an
adjacent
station
is
interfering
with
that
of the station
being
tuned
in (10kHz
beat interference).
© TV
set is on in the same
house where
the receiver.
@ White
noises
generated
from
automobile
engines,
@ Radio
frequency
sewing
machine
or weld-
ing machine being used near your house.
® Note
that the service
area covered
by an
Impossible to. remove
such
interference.
If the cause of
such
noise
is
in
the
TV
set,
increase
the
distance
between
the
TV
set
and
receiver.
In an
area
surrounded
by
hills or high
buildings,
the
FM
input
signals are very weak. Thus the noise limiter
in the. circuit loses its function. Set up an outdoor
FM
antenna having many reflector elements,
Increasing
FM
input
signal
may
alleviate this problem.
switched
to radio reception,
the noise will disappear.
program,
@ Jack connection
is loose. (b)
®@ Line
cord
or fluorescent
lamp
is near the
shielded wire. (c)
® Poor grounding. (d)
® HAM
transmitting
station or TV transmit-
ae
station is near your house, {e)
Correct
the
conditions
stated
in (a), (b), (c) or (d),
In case of .(e), report it to an official activity.
Output tone quality is poor
When
Playing
Records
and
mixed
with
noise.
Treble
is not clear,
e@ Stylus is worn
out. (a)
® Record
is worn
out.
(b) .
® Dust adheres to stylus. (c}
@ Improper
mounting
of stylus.
(d)
® Stylus
pressure
is not
proper.
(e)
® The
TREBLE
sound
level is too high.
Check
(a) through
(e) and
correct the condition,
Lower
the TREBLE
level.
Lower the TREBLE
level.
to be mistaken to troubles of the unit.
|
L
Symptom
Suspected Source of Noise
a
+
Diagonosis and Remedy
Power
is not turned
on al-
though
the power switch
is
set to ON,
® Fuse is blown,
(a)
® Line plug is joose. (b)
Check (a) and (b) and correct the condition.
in playing a record, increas-
ing the
volume
will
cause
howling.
fs Distance
between
the
record
player
and
the speakers
is too short.
@ The
place
on
which
the
record
player or
speakers is unstable.
—j—
PIONEER
ELECTRONICS
U.S.A. CORPORATION
140 Smith St.
<69HO2ZYO1T>
15-5,
4-Chome,
Ohmori-nishi,
Ohta-ku,
Tokyo,
Japan
Farmingdale,
L.I.,
N.Y. 11735, U.S.A.
PIONEER
ELECTRONIC[EUROPE]
AG.
59, Forch Strasse,
8032
Zurich,
Switzerland
€ R12-057-0)
PRINTED IN JAPA
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