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OI
CON
DITIONS
FREQU
ENTLY
M
ISTAKEN
TO
TROU
BLES
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
is deteriorated)
and
(21
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-f
i
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 out-
put
noise.
lf
your
receiver produces
a
noise,
check
according
to
the
following table and
trace
out
the
source
of
noise
for
an
appropriate corrective action.
The table
includes
the
conditions
that
may be
mistaken to
troubles
of
the unit.
Symptom
Suspected
Source
of
Noise
Diagonosis
and
Remedy
o
o
o
a
o
ID
o
.!
c
o
.9
J
c
o
I
3
Continuous or intermittent
noise
like
jijjij ot
zzzzzz,
.
Statics
or
listening.
a Flourescent
lamp,
motor, or
thermostat
may
be
used
in
house
or in
the
vicinitv
of the
house.
ln
many
cases,
it
is
very
difficult to
remove
the
source
of
noise.
ln
order
to
increase
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
program
.
a Poor
fluoresent
lamp,
motor, or
electric
heater
may
be used
in
house
or
near the
hou
se.
Fleversing
the
llne
plug
may
occasionally alleviate this
noise problem, Usually
it
is
very
difficult to
eliminate
the
noise.
Hissing sound noise
in
AM
(medium wave)
reception.
a
The frequency
of
an
adjacent
station
is
interfering
with that of
the station
being
tuned
in
(1okHz
beat interference).
. TV set is on in the
same
house
where
the
receiver.
lmpossible
to
remove such
interference.
lf
the
cause
of
such
noise
is in the TV set,
increase
the
distance
between
the TV set and
receiver.
Static
noise
in FM reception
(in
particular, when
auto-
mobiles
run
close
to
the
house).
a
White
noises generated
from
automobile
engines.
a
R
adio
f
requepcy
sewing
mach
ine
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
outdoor
FM
antenna having many
reflector
elements.
o
o
o
cc
o
.g
s
o-
c
o
3
Reception
of FM
stereo
program contains
more
noise than FM
mono
proqram.
a
Note
that the
service area
covered by
an
FM
stereo broadcast is
about
50
%
that of a
regular
mono
broadcast.
lncreasing
FM input
signal
may
alleviate
this
problem"
Use
an
exclusive
FM
outdoor
antenna
instead
of
the
indoor
T-antenna.
Hum or
buzz,
When
switched
to
radio reception,
the
noise
will
disappear,
a Poor
connection
of
shielded
wire
(a).
a Jack
connection
is
loose.
(b)
a Line cord or
fluorescent lamp
is near the
shielded wire,
(c)
o
Poor gyounding.
(d)
a 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
(e),
report
it to
an
official
activity.
Output
tone
quality
is
poor
and
mixed
with
noise.
Treble
is
not
clear.
.
Stylus is
worn out.
(a)
.
Record is
worn
out.
(b)
.
Dust
adheres
to
stylus.
(c)
.lmproper
mounting
of
stylus.
(d)
a
Stylus
pressure
is
not
proper.
(e)
.
The TREBLE
sound tevel
is
too
high.
Check
(a)
through (e)
and correct
the
condition,
Lower
the TREBLE
level,
Lower the
TREBLE
level,
Further, watch the following conditions:
These are also
apt
to
be mistaken
to
troubles
of the
unit.
Symptom
Suspected
Source
of
Noise
Diagonosis
and
Remedv
Power
is not
turned on
al-
though the
power
switch
is
set
to
ON.
o
Fuse
is blown.
(a)
'
.
Line plug
is
loo*.
(b)
Check (a) and
(b)
and
correct
the
condition.
ln
playing
a
record,
increas-
ing
the
volume
will
cause
howling.
a Distance between
the
record
plaver
and
the
speakers
is too
short.
a
The
place
on which the
record player
or
speakers
is
unstable.
Change
the
distance
or
rearrange
the
installation
posit-
ions
of the unit
and
speakers.
(lnstallinq
the
.ecord
plaver on
a
firm,
solid
stand
may alleviate
this
problem.)
Do
not
eR+t€nce
the
BASS
sound
level excessively.
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