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[17ST Y
CONDITIONS FREQUENTLY
MISTAKEN
FOR MALFUNCTION
SYMPTOM
SUSPECTED SOURCE OF NOISE
DIAGNOSIS AND REMEDY
WHEN
LISTENING
TO
BROADCASTS
Continuous or intermittent
noise like jjjjjj or zzzzzz.
+ Static (lightning)
+ Fluorescent
lamp,
motor,
or thermostat
may be in use in house or in the vicinity of
the house.
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.
When a station is tuned in,
hum
is mixed
in the pro-
gram.
Poor fluorescent
lamp, motor, or electric
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 '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.
Impossible to remove such interference. If the case 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
engines.
+ High
frequency
sewing machine
or weld-
ing machine
being used near your house.
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 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.
Increasing FM input signal may alleviate this problem.
Use an exclusive FM outdoor antenna instead of the
indoor T-type antenna.
WHEN
PLAYING
RECORDS
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 of fluorescent lamp is near the
shielded wire. (c)
Poor grounding. (d)
+ Ham
transmitting station or TV transmit-
ting 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 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)
+ Stylus pressure is not proper. (e)
+ The TREBLE
level is too high.
Check (a) through (e) and correct the condition.
Lower the TREBLE level.
WATCH
FOR THE FOLLOW ING 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 condition.
Power
ON
but
speakers
produce no sound.
* Blown-out PROTECTION fuse.
Refer
fuse
replacement
work
to
qualified
service
personnel at Pioneer authorized Service Center.
In 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.
(Installing
the
turntable
on
a firm, solid stand
may
alleviate
this
problem.)
Do not enhance the BASS sound level excessively.
PIONEER
ELECTRONIC
CORPORATION
4-1, Meguro
1-Chome,
Meguro-ku,
Tokyo
153,
Japan
<75HO4M121B>
U.S. PIONEER
ELECTRONICS
CORPORATION
75
Oxford
Drive,
Moonachie,
New
Jersey
07074, U.S.A.
PIONEER
ELECTRONIC
(EUROPE)
N.V.
Luithagensteenweg,
no.9
2030
Antwerp,
Belgium
PIONEER
ELECTRONICS
AUSTRALIA
PTY.
LTD.
178-184
Boundary
Road, Braeside, Victoria
3195,
Australia
Printed in Japan
<ARB-102-D>
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