Mitsubishi Electric 55624R(S)-MF Service Manual page 129

Due to differences in AM and FM systems, AM
is more susceptible to noise interference.
Were conditions such as the following present when
noise was received?
Lightning was flashing. A motorcycle was passing.
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A vehicle passed close by, but it appeared to be a
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vehicle generating a particularly large amount of noise
radiation.
Passed beneath a power line. Passed under a bridge.
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Passed beneath a telephone line. Passed close by a
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s i g n a l g e n e r a t o r .
Passed close by some other source of electrical noise.
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Continue to check for static; when static is
detected, check for the conditions listed above.
If the problem is particularly worse than other radios,
consult a service center.
2. There is much noise only on FM
Due to differences in FM and AM systems, FM
is not as susceptible as AM to interference from
engines, power lines, lightning, etc. On the
other hand, there are cases due to the character-
istics of FM waves of noise or distortion
No
Yes
Noise prevention on the radio side is difficult.
If the problem is particularly worse than other
radios, consult a service center.
generated by typical noise interference (first
fading and multipath). (Refer to A-2.)
<Noise (hissing) occurs in weak signal areas
such as mountainous regions, but this is not due
to a problem with the radio.>
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