Mitsubishi Electric 55624R(S)-MF Service Manual page 127

The following factors can be considered as possible
causes of noise appearing at night.
1. Factors due to signal conditions:
Due to the fact that long-distance signals are
more easily received at night, even stations that
are received without problem during the day
may experience intereference in a general
worsening of reception conditions The weaker
a station is the more susceptible it is to
interference, and a change to a different station
Does the noise occur even
when the lights are turned
off?
Yes
Tune to a station with a
l
strona
No
service center.
2. Factors due to vehicle noise:
Is the antenna plug
properly connected
radio?
the
Inspect the alternator noise sup-
pressor (refer to A-6).
N o
Does the following measure elim-
inate the noise?
Move the harness on the vehicle
l
side away from the radio body (if
harness is not in the proper
the
position).
noise than other radios. consult a
or the appearance of a beating sound* may
occur.
*Beat sound: Two signals close in frequency
interfere with each other, creating a repetitious
high-pitched sound. This sound is generated not
only by sound signals but by electrical waves as
well.
Alternator noise may be a cause.
Correctly connect the
to
antenna.
I
I
No