Mitsubishi Montero Sport (2004+). Manual - part 560
RADIO AND TAPE PLAYER
TSB Revision
CHASSIS ELECTRICAL
54-227
INSPECTION PROCEDURE 10: Some Noise Appears when there is Vibration or Shocks during
Traveling.
.
DIAGNOSIS
STEP 1. Check that the connectors are properly
connected.
NOTE: For the corresponding connectors, etc., refer
to GROUP 90, Radio and Tape Player <vehicles
without amplifier.> or <vehicles with amplifier.>
Q: Are the connectors properly connected?
YES :
Go to Step 2.
NO :
Check the condition of the connector. Refer
to GROUP 00E, Harness Connector
Inspection
. Check that there is no
noise.
STEP 2. Check that noise appears when the radio
switch is turned on while the vehicle is stopped.
NOTE: Static electricity noise: Body static electric
from the shock absorber rubber bushings used to
prevent vibration, tires, etc. occurs because of sepa-
ration from the ground, causing a buzzing noise.
Since no measures can be taken to discharge the
static electricity of the vehicle body. Check that there
is no noise.
Q: Does noise appear when the radio switch is turned
on while the vehicle is stopped and the radio is
tapped while tuned away from a station?
YES :
Go to Step 3.
NO :
It may be static electricity noise.
STEP 3. Check that the radio is correctly
grounded.
Q: Is the radio correctly grounded?
YES :
Go to Step 4.
NO :
Tighten the screw securely. Check that
there is no noise.
STEP 4. Check that the antenna is correctly
grounded. (If noise appears when the antenna is
moved, this means the ground is not securely
connected.)
Q: Is the antenna correctly grounded?
YES :
Repair or replace the radio. Check that
there is no noise.
NO :
If rust is present on the antenna ground
screw, clean off the rust and tighten the
ground screw securely. Check that there is
no noise.
INSPECTION PROCEDURE 11: Noise Sometimes Appears on FM during Traveling.
.
Radio and CD Player Circuit
Refer to GROUP 90, Radio and Tape Player <vehi-
cles without amplifier> or <vehicles with amplifier>.
.
DIAGNOSIS
STEP 1. Retune the radio, and check that there is
no noise.
Q: Does the problem clear up when returned?
YES :
Check that there is no noise.
NO :
Go to Step 2.
STEP 2. Check that the noise appears only in
certain locations and only with certain stations.
NOTE: Multipath noise and fading noise: Because of
the frequency of FM waves in extremely high, it is
highly susceptible to effects from geological forma-
tions and buildings. These effects disrupt the broad-
cast signal and obstruct reception in several ways.
.
•
Multipath noise
This describes the echo that occurs when the
broadcast signal is reflected by a large obstruc-
tion and enters the receiver with a slight time
delay relative to the direct signal (repetitious
buzzing).
•
Fading noise
This is a buzzing noise that occurs when the
broadcast beam is disrupted by obstructing
objects and the signal strength fluctuates intri-
cately within a narrow range.