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POINTS TO BE CHECKED PRIOR TO SERVICING
In initially installing this amplifier improper connections
to a tuner or turntable may result in one of the following
indications of trouble.
Their possible causes and corrective
measures are listed below to facilitate installation.
SYMPTOM
PROBABLE CAUSE
CORRECTION
No pilot lamp indication, no sound al¬
though AC is switched ON.
Poor AC plug connection.
Check plug contact.
No sound from LEFT and RIGHT.
a) Speaker cords disconnected.
b) SPEAKERS switch set to OFF posi¬
tion.
c) Volume Control (extreme left).
d) TAPE switch at TAPE A or TAPE
B position.
a) Check connections from amp. output to
speakers.
b) SPEAKERS switch should be switched
to OFF only when using stereo head¬
phones.
c) Set to appropriate volume level.
d) Always set to SOURCE except when
using tape decks.
Sound only from one side.
a)
Poor speaker cord connections.
b) BALANCE control set to one extreme
or other.
a) Check amp. output and speakers con¬
nections.
b) Adjust BALANCE control.
Difference in volume level of radio and
phono.
Difference in received signal and phono
output levels.
Set to appropriate volume level.
No sound from LEFT and RIGHT, or
sound only from one side.
Turntable output cord disconnected.
See that turntable output cord is firmly
plugged into amp. input.
Loud hum drowns out sound.
Poor turntable output cord prong con¬
nections.
See that turntable output cord is firmly
plugged into amp. input.
Sound audible but background hum
occurs.
a) Turntable
output cord picking up
hum from AC cord.
b) Turntable not grounded.
a)
Keep turntable output cord away from
AC cords.
Choose cord paths which
keep hum at a minimum.
Reverse turn¬
table AC plug connections.
b) Connect ground wire to GND terminal.
Sound
audible
but continuous back¬
ground buzz interferes.
TV signal picked up by Turntable output
cord.
Frequency occurs near TV trans¬
mitting antenna.
Route turntable cord so that hum is mini¬
mized.
Howling noise occurs when volume is
raised or bass response is increased.
Speaker vibrations induce feedback in
Pickup.
Increase distance between turntable
and
speakers.
Choose speaker locations care¬
fully.
Remember, loose flooring induces
howling.
14
KA 7100(K)
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