Sansui TU-666 - General Troubleshooting Chart

GENERAL TROUBLESHOOTING CHART
In some instances, the amplifier which is operating satisfactorily
develops hum or noise as listed on this page. In this case, elimi-
nate the trouble source as indicated in the column under WHAT
TO DO.
If you are confronted with a trouble not covered here or if you
have any questions concerning the operation and maintenance
of this amplifier, please contact our Customer Service Depart-
ment.
2. Incorrect or improper operation of tuner and/or
other components;
3. Improper location of components;
4, Other component or components defective.
Other probable causes are listed below:
If
your
AM
and/or
FM
stereo
listening
isn’t
all
you’d
expected,
it
is
in
many
cases
that
the
tuner
is
not
at
fault.
The
trouble
may
attributed
to
the
following:
1,
Incorrect
component
connection
or
loose
termi-
nal
contact;
PROGRAM
SYMPTOM
PROBABLE
CAUSE
WHAT
TO
DO
RR
AM,
FM
mono}
A.
Constant
or
intermitt-
|
*
Discharge
or
oscillation
Attach
a
noise
limiter
to
the
*
or FM stereo
ent noise heard at
times or in a certain
area
caused by electrical appli-
ances, such as fluorescent
lamp, TV set, D.C. motor,
rectifier and oscillator
Natural phenomena, such
as atmospherics, _ statics,
strays and thunderbolt
Insufficient antenna input
due to thick reinforced
concrete wall of a building
or long distance from the
station
Wave interference from
other electrical appliances
electrical appliance that causes the
noise, or attach it to the power
source of the amplifier.
* Install an outdoor antenna and
ground the amplifier to raise the
signal-to-noise ratio.
* Reverse the power cord plug-
receptacle connections.
* If the noise occurs at a certain
frequency, attach a wave trap to the
ANT. input.
* Keep the set in proper distance from
other electrical appliances.
B. The needle of the
The movement of the needle
Turn the set for maximum signal
is one thing, the sensitivity of
the amplifier is another.
tuning meter does not strength.
move well.
Regional difference in field | The unit is not at fault.
intensity
C. The zero point of the
meter diverges much.
* Install the antenna for maximum
antenna efficiency. ;
This results from the nature of
Noise heard at a par-
AM broadcast.
ticular time of a day,
in a certain area or
over part of dial
AM A.
* In some cases, the noise can be
eliminated by grounding the ampli-
fier or reversing the power cord -
plug-receptacle connections.
* Adjacent-channel interfer-
* Although such noise cannot be
ence or beat interference
eliminated it_is advisable to switch
on the noise filter of the amplifier.
B. High-frequency noise
* TV set too close to the | * Keep the TV set in proper distance
audio system from the audio system.
2 eS el
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