Mitsubishi MOTORS Eclipse 1997, Service Manual

Page: 494 / 540

Radio, Tape Player,
CD
Player,
CHASSIS ELECTRICAL
Amplifier, Speaker
Some noise appears when there is vibration or shocks during traveling.
Are connectors properly connected?
Yes
the vehicle is stopped and the radio is struck while tuned
a
No
Ensure proper
noise:
to
electric from the shock absorber rubber bushings used
vibration, etc. occurs because of from
Yes
I
the ground, causing a buzzing noise.
Since no
measures can be taken on the side. should be‘
taken to discharge the static electricity of the body.
Is the radio correctly
(Is the mounting screw tightened securely?)
Yes
Tighten the screw securely.
Is the antenna correctly (If noise appears when
the antenna is moved, this means the ground is not securely
If rust is present of the antenna ground clean and
connected.)
g r o u n d s e c u r e l y .
Repair or replace radio.
Yes
Noise sometimes appears on FM during traveling.
Does the problem clear up when returned?
No
Yes
OK
Does the problem appear only in certain locations and only
with certain stations?
Due to electrical field conditions.
No
Are connectors property connected?
Check connector connections.
Yes
Does noise appear when the radio switch is turned on while
the vehicle is stopped and the radio is struck while tuned
awav from a station?
Yes
No
Is the radio body correctly grounded?
(Is the mounting screw tightened securely?)
No
Tighten the screw securely.
Yes
the antenna grounded? (If noise appears when
the antenna is moved, this means the ground is not securely
rust is
ground securely.
connected.)
Yes
Repair or replace radio.
About noise and fading noise
Because the frequency of FM waves is
extremely high, it is highly susceptible to effects
from geological formations and buildings.
These effects disrupt the broadcast signal and
obstruct reception in several ways.
l
Multipath noise
This describes the echo that occurs when
the broadcast signal is reflected by a large
obstruction and enters the receiver with
a slight time delay relative to the direct
signal (repetitious buzzing).
l
Fading noise
This is a buzzing noise that occurs when
the broadcast beam disrupted by
obstructing objects and the signal strength
fluctuates intricately
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