Conditions Frequently Mistaken - Pioneer TX-9500II Operating Instructions Manual

CONDITIONS FREQUENTLY MISTAKEN FOR MALFUNCTION
If your stereo system appears to malfunction, first
check such things as the controls (power switch,
function selector, tape monitor, etc.) and connect-
ing 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.
When a hi-fi unit produces an unpleasant noise, it is
SYMPTOM
Continuous or intermittent
noise like jjjjij or t z z z z z .
When a station is tuned in,
hum is mixed in the pro-
gram.
H~ssing sound noise in AM
(medium wave) receptcon.
Static noise (in particular,
when automobiles run
close to the house).
Reception o f FM stereo
program contains more
noise than FM mono pro-
gram.
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 definite output noise. If your
tuner produces a noise, check according to the
following table and trace out the source of noise
for the appropriate corrective action.
SUSPECTED SOURCE OF NOISE DIAGNOSIS AND REMEDY
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 t o remove the
source of noise. In order t o make the radio
input larger than the noise level, set up a good
outdoor antenna and make a complete groun.
ding.
0
Poor fluorescent lamp. motor, or electric
heater may be in use in house or near the
house.
Reversing the line plug may occasionally al-
leviate this noise problem. Usually i t is very
difficult t o eliminate the noise.
8
The frequency of an adjacent station is
interfering with that of the station being
tuned in (1OkH.z beat interference).
0
TV set i s on in the same house with the
tuner.
Impossible to remove such interference. I f the
cause of such noise is the TV set, increase the
distance between the TV set and tuner.
0
White noise generated from automobile en-
gines.
High frequency sewing machine or welding
machine being used near your house.
PIONEER ELECTRONIC CORPORATION
4-
1 . M e g u r o
I
-Chome. Meguro-ku. Tokyo
1
53. Japan
U.S. PIONEER ELECTRONICS COFIPORATION
85
Oxford D r ~ v e , Moonach~e. N e w Jersey 07074. U S.A.
PIONEER ELECTRONIC [EUROPE) N.V.
L u ~ t h a g e n - H a v e n
9. 2030
Antwerp, B e l g w m
PIONEER ELECTRONICS AUSTRALIA
mv.
LTO.
1 7 8 - 1
8 4 Boundary Road, Eraes~da, V ~ c t o r ~ a 3195, A u s t r a l ~ a
Printed in Japan
In an area surrounded by hills or high buildings.
the FM input signals are very weak. Thus the
noise limiter i n the circuit loses i t s function. Set
up an FM outdoor antenna having many direc.
tor elements.
Note that the service area covered by an FM
stereo broadcast i s about 50% of that of a
regular mono broadcast.
Increasing the FM input signal may alleviate
this problem. Use an FM outdoor antenna
instead of the indoor T-type antenna.