COMPONENT SERVICE-RADIO
AND STEREO
Be sure that preparations 1 through 5 have been correctly
made.
Insert a screwdriver into the trimmer adjusting hole,
Turn the screwdriver clockwise or counterclockwise for maxi-
mum sensitivity (maximum broadcast wave sound).
If the optimum sensitivity point cannot be found, check for
an antenna malfunction or a broken wire.
NOISE SUPPRESSION
Noise interfering with radio reception may be roughly classi-
fied as follows:
(1) Noise produced by the vehicle itself
Noise from the ignition circuit, alternator circuit, etc.
(2) Noise generated in the radio itself
Thermal noise from transistors, IC, resistor, etc.
(3) Atmospheric noise
Noise from other cars, neon signs, etc.
The radio has devices to suppress noise of the radio itself and
atmospheric noise, but it is difficult to eliminate them
completely. Noise produced by the vehicle includes whining
from the alternator system, and a strong, impulsive, fast pop-
ping noise from the ignition.system.
Before .performing any checking or adjustments, tirs,t confirm
the following points.
l
Adjust the antenna trimmer completely. ’
l
Set the pushbuttons (tuning) properly. L
l
Extend the antenna all the way.
/
Prevention of Ignition Circuit Noise
A resistance-equipped cable is used for the high-tension- cable
in order to prevent noise; however, if any noise from the igni-
tion circuit does occur, check the tightness and ground con-
nection of the positive (+) terminal of the noise filter, and, if
necessary, check the noise filter.
Caution
Be careful not to connect the noise filter to the higlh-tension
cable; doing so could damage the noise filter.
Prevention 6f Other Circuit Noise
For other noises, take necessary corrective actions in actor-
dance with the following items and the NOISE SIJPPRES-
SION CHART.
.
Polish the grounding cable terminal, and connect it properly.
Polish the pillar antenna ground terminal, and donnect it
properly.
Ground electric parts completely.
Keep the antenna cable and speaker lead wire away from
other electric wiring.
8-162
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