Pioneer SX-980 Manual de Instruções - Página 22
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(IONE
CONDITIONS FREQUENTLY MISTAKEN
FOR MALFUNCTION
If your stereo appears to malfunction, first check
such things as the controls (power switch, function
selector, tape monitor, etc.) and connecting cords
(components connected correctly).
Noise: There are a variety of noises relating to the
operation
of
a hi-fi
unit.
These
are
generally
divided into two types; (1) the unit is faulty (a
transistor
or
part
has
deteriorated)
and
(2) an
external source is adding to the unit.
often assumed that the unit is faulty, but statistical
records
indicate
that the majority of noises pro-
duced
in hi-fi acoustic units result from external
sources of noise: Due to the inherent high sensi-
tivity and the high fidelity in reproduction, the
unit amplifies
and reproduces
extraneous noises,
however small, into audible output noise. If your
receiver produces a noise, check according to the
following table and trace out the source of noise
When a hi-fi unit produces an unpleasant noise, it is
When
listening
to broadcasts
for the appropriate corrective action.
Symptom
Continuous or intermittent
buzzing noise.
When a station
is tuned in,
hum
is mixed
in the pro-
gram.
Hissing sound noise in AM
(medium
wave)
reception.
Static
noise
(in particular,
when
automobiles
run
close to the house).
Reception
of
FM _ stereo
program
contains
more
noise
than
FM
mono
pro-
gram,
—}——
buzz.
When
radio
recep-
tion, the noise disappears.
Hum
or
switched
to
Suspected source of noise
e Static (lightning)
e@ Fiuorescent
lamp,
motor,
or thermostat
may be
in use in house or in the vicinity of the house.
Diagnosis and remedy
In many
cases,
it is very difficult
to remove
the
source
of noise.
In order to make
the radio input
larger than
the noise level, set up a good outdoor
antenna and make a complete grounding.
e@Poor
fluorescent
lamp, motor, or electric heater
may be in use in house or near the house.
Re
@The
frequency
of an
adjacent
station
is inter-
fering with
that of the station
being tuned
in
(10kHz beat interference).
eTV
set is on in the same house with the receiver.
e@White
noise generated
from automobile engines.
@High
frequency
sewing
machine
or
weiding
machine being used near your house.
eNote
that
the service area covered
by an
FM
stereo broadcast is about 50% of that of a regular
mono broadcast.
e@ Poor connection of shielded wire. (a)
e@ Jack connection is loose. (b)
e@ Line
cord
of fluorescent
lamp
passes
near
the
Reversing
the line plug may occasionally alleviate
this noise problem.
Usually
it is very difficult to
eliminate the noise.
Impossible
to
remove
such
interference.
If the
cause
of such
noise
is 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
FM
outdoor
antenna
having
many
director
ele-
ments.
Increasing
the FM
input signal
may
alleviate this
problem.
Use an
exclusive
FM
outdoor
antenna
instead of the indoor T-type antenna.
Correct the conditions stated in (a), (b), (c) or (d}.
In case of (e), report it to an official authority.
wn
g
shielded wire. (c)
8
@ Poor grounding. (d)
a
eHam
transmitting
station
or
TV
transmitting
=
station is near your house. (e)
4 [ Output
tone
quality
is | Stylus is worn. (a)
Check (a) through (e) and correct the condition.
& | poor and mixed with noise.
| ¢ Record is worn. (b)
= | Treble is not clear.
@ Dust adhering to stylus. (c)
=
e@ Stylus is improperly mounted. (d)
e@ Stylus pressure is not correct. (e)
@ The TREBLE
level is too high.
Lower the TREBLE
level.
In
playing
a
record,
in- | @ Distance between
the turntable and the speakers | Increase the distance or rearrange
the installation
creasing the volume causes
is too short.
of the unit and speakers.
(Installing the turntable
howling.
@The
turntable
or speakers supports are unstable.
| on a firm, solid stand may alleviate this problem.)
Do not enhance the BASS
sound
level excessively.
-——_——_-
2)
Howling occurs
e@ Feedback between microphone and speakers.
@ Keep microphone away from speakers.
= Ee
@ Do not set the VOLUME
control too high.
ge
eSet BASS and TREBLE controls to center posi-
1S a
tions.
PIONEER
ELECTRONIC
CORPORATION
4-1, Meguro
1-Chome,
Meguro-ku,
Tokyo
153, Japan
U.S. PIONEER
ELECTRONICS
CORPORATION
85
Oxford
Drive, Moonachie,
New
Jersey
07074,
U.S.A.
<78A00F3B02>
PIONEER
ELECTRONIC
(EUROPE)
N.V.
Luithagen-Haven
3, 2030
Antwerp,
Belgium
PIONEER
ELECTRONICS
AUSTRALIA
PTY.
LTD.
178-184
Boundary
Road,
Braeside,
Victoria
3195,
Australia
Printed in Japan
<ARB-249-0>