Pioneer SX-828 Operating Instructions Manual page 13

TJIONEEfiI
CONDITIONS FREOUENTLY
MISTAKEN
FOR MALFUNCTION
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.
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
o
F
o
o
o
o
tr
6
o
F
o
z
=
uJ
F
2
J
z
uJ
I
=
Continuous or intermittent
noise
like
jjj\jj
or
zzzzzz.
Static
(lightning)
Fluorescent lamp, motor,
or
thermostat
may
be
in
use
in
house
or in
the
vicinity
of
the
house.
ln
many
cases,
it
is verV
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 Iamp, motor, or
electric
heater may be
in
use
in
house
or
near
the
ho
use
.
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
an
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
receiver
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.
Static
noise
(in
particular,
when
automobiles
run
close
to
the
house).
.
White noise generated
from
automobile
en gi
nes.
.
Radio
f
requency sewing 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%
o{
that
of
a
regular mono
broadcast.
lncreasing Flvl
input
signal may alleviate this problem.
Use an exclusive
FM outdoor
antenna instead
of
the
indoor
T-type
antenna.
tt
o
E
o
o
ut
E
c
z
;
J
o-
z
uJ
I
=
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.
(6).
Poor
groundinq.
(d).
Ham transmitting station
or TV
transmit-
ting station
is
near
your
house.
(e).
Correct the conditions
stated
in (a),
(b),
(c) or
(d).
ln
case
of
le),
report it to
an
official
activity.
Output
tone quality
is
poor
and mixed
with
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
TRE
BLE level
is
too
high.
Check
(a) through
(e) and correct the condition.
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
tu
rned
on
although the power
switch
is set
to
ON.
Fuse blows. (a)
Line
plug
is loose.
(b)
Check
(a) and
(b) and
correct the condition.
ln
playing a
record,
in-
creasing the volume
causes
howling.
" D;stanc€ between
the turntable
and
speakers is
too short.
"The
place
on
which the
turntable
speakers are set is unstable.
the
or
Change
the
distance
or
rearrange
the
installation
increase
of the unit
and
speakers.
(lnstalling
the
turntable
on
a
firm,
solid stand may
alleviate this
problem.)
Do not
enhance
the
BASS sound level
excessively.
duced
in hi-fi
acoustic
units result frorn
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.
r4