Pioneer SX-727 Інструкція з експлуатації - Сторінка 12
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CONDITIONS FREOUENTLY
MISTAKEN
FOR
MALFUNCTION
Ir{oise:
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.
When
a
hi-fi unit
produces an unpleasant noise,
it
is
often
assumed
that the unit
is
faulty, but statistical
records indicate
that
the majority
of
noises pro-
SYMPTOM
SUSPECTED SOURCE.OF NOISE
DIAGNOSIS
AND
REMEDY
a
O
o
o
cc
6
o
F
(9
z
2
IIJ
2
z
Lrl
I
Continuous or intermittent
noise
like
jjjjjj
or
zzzzzz.
.Static
(lightning)
"
Fluorescent
lamp,
motor, or
thermostat
may
be
in
use
in
house
or in
the
vici
nity
of
the
house.
ln
many
cases,
it
is
very
difficult
to
remove the
source
of
noise.
ln
order
to
make
the radio
input
larger
than
the
noise level,
set up
a good
outdoor
antenna
and
make
a
complete
grounding.
When a
station is
tuned in,
hum
is
mixed
in
the
pro-
gram.
"
Poor fluorescent lamp,
motor, or
electri
c
heater
may
be
in
use
in
house
or
near
the
house.
Reversing
the
line plug may
occasionally alleviate this
noise
problem. Usually
it
is
very
difficult
to
eliminate
the
noise.
Hissing sound noise
in
AM
(medium
wave )
reception.
The
frequency
of
arr adjacent
station
is
interfering
with that
of
the
station
being
tuned
in
(10kHz beat interference).
TV
set
is
on
in
the
same house
with
the
re cei
ver
.
lmpossible
to
remove such interference.
lf
the
cause
of
such
noise
is
in
the TV
set, increase
the
distance
be-
tween the
TV
set
and
receiver.
Stati
c
noise
(in
particular,
when
automobi
les
run
close
to the
house).
White
noise generated
from
automobile
en gi
nes.
Radio frequency
sewi
ng
machine
or
weld-
ing machine being
used near
your
house.
ln
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
elements.
Reception
of FM
stereo
program contains
more
noise
than FM mono
pro-
gram.
. Note that the
service area covered
by
an
FM
stereo broadcast is
about
50%
of
that
of
a
regular mono
broadcast.
lncreasing
FM
input
signal may alleviate
this
probrem.
Use
an exclusive
FM outdoor
antenna instead
of
the
indoor
T-type
antenna.
o
o
E
o
O
uJ
tr
(9
z
;
o-
z
u,l
r
=
Hum or buzz.
When
switched
to
radio
recep-
tion, the
noise
disappears.
.
Poor connection
of
shielded
wire
(a).
"
Jack connection is loose. (b).
" Line
cord
or
fluorescent lamp is
near
the
shielded
wire.
(c).
.
Poor
gro und
ing.
(d
)
.
.
Ham
transmitti
ng station
or
TV
transmit.
ti
ng
station
is
near
your
house.
(e).
Correct the conditions stated
in
(a),
(b),
(c)
or
(d).ln
case
of
(e),
report
it
to
an off
icial activity
.
Output tone
quality
is
poor
and mixed
wi
th
noise.
Treble
is
not
clear.
Stylus
wears
out.
(a)
Record
wears
out.
(b)
Dust
adheres
to stylus.
(c)
Stylus
is
improperly mounted.
(d)
Tracking
force
is
not proper.
(e)
The
TREBLE
level
is
too
high.
Check
(a)
through (e)and
correct
the
conditi on.
Lower the
TREBLE
level.
WATCH FOR
THE
FOLLOWING CONDITIONS; THESE
ARE ALSO APT TO
BE
MISTAKEN
FOR MALFUNCTIONS.
SYMPTOM
SUSPECTED SOURCE OF NOISE
DIAGNOSIS
AND
REMEDY
Power is not turned
on
although
the
power
switch
is set
to
ON.
Fuse
blows.
(a)
Line
plug
is
loose.
(b)
Check
(a)
and
(b) and
correct
the conditi
on.
ln
playing
a
record,
in-
creasing
the volume
causes
howling.
Distance between
the
turntable and
the
speakers is
too
short.
The place on which the
turntable
or
speakers are
set
is unstable.
Change
the
distance
or
rearrange
the
installation
increase
of the unit and
speakers.
(lnstalling
the
turntable
on a firm,
solid stand may
al
leviate
this
problem.)
Do
not
enhance
the
BASS
sound
level excessively.
duced
in hi-fi
acoustic
units result from
external
sources
of noise:
Due
to the
inherent
high
sensitivity and
the high fidelity in
reproduction,
the unit
amplifies
and
reproduces
extraneous
noises,
however small,
into definite output
noise.
If
your
receiver produces a
noise, check according to
the following table and
trace
out the
source of
noise
for
the appropriate corrective action.
t3