Mitsubishi L200. Manual — part 729

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-283

AC504001

AB

Earth cable

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-284

Inspection Procedure 9: Some noise appears when there is vibration or shocks during travelling.

DIAGNOSIS PROCEDURE

STEP 1. Connector check: Radio and CD player
connector C-125, C-126 and audio amplifier
connector D-30, D-31 <vehicle with audio
amplifier>.

Q: Is radio and CD player connector C-125 and audio

amplifier connector D-30, D-31 <vehicle with audio

amplifier> in good condition?
YES :

Go to Step 2.

NO :

Repair or replace the connector. Check that
there is no noise.

STEP 2. Check that 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.
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 earth, 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 correctly earthed.
The radio is connected to the earth with an assem-
bling screw.

Q: Is the radio correctly earthed?

YES :

Go to Step 4.

NO :

Tighten the screw securely. Check that
there is no noise.

STEP 4. Check by replacing the radio and CD
player.

Q: Are operations normal when using another radio

and CD player?
YES :

Either repair or replace the radio and CD

player. Check that there is no noise.

NO :

Either repair or replace the antenna
assembly. Check that there is no noise.

AC903856BU

Harness side

Connectors: C-125, C-126 <LHD>

C-125

C-126

C-125

Harness side

C-126

AC903868

CR

Harness side

Connectors: C-125, C-126 <RHD>

C-125

C-126

C-125

Harness side

C-126

AC903885AB

Connectors: D-30, D-31 <LHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

AC903886 AB

Connectors: D-30, D-31 <RHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-285

Inspection Procedure 10: Ever-present noise.

DIAGNOSIS PROCEDURE

Noise is often created by the following factors, and
often the radio is OK when it is checked individually.

• Travelling conditions of the vehicle

• Terrain of area travelled through

• Surrounding buildings

• Signal conditions

• Time period

For this reason, if there are still problems with noise
even after the measures described in inspection pro-
cedure 5 to 9 have been taken, get information on
the factors listed above as well as determining
whether the problem occurs with AM/FM/WM/LW,
the station names, frequencies, etc. and contact the
radio manufacturer's service centre.

Inspection Procedure 11: There is noise but no reception for both AM and FM or no sound from AM,
or no sound from FM.

DIAGNOSIS PROCEDURE

STEP 1. Check the state of the antenna.

Q: Is the antenna assembled?

YES :

Go to Step 2.

NO :

Assemble the antenna.

STEP 2. Check to see if inspections are taking
place is an area exposed to special electric
fields.

Q: Are inspections taking place under special electric

field conditions (underground garage, inside a
building, etc).?
YES :

Go to Step 3.

NO :

Go to Step 4.

STEP 3. Relocate and check.
Automatically receive in a good reception area that is
not exposed to special electric fields.

Q: Is reception of the strongest radio frequency

possible within the area?
YES :

There is no action to be taken.

NO :

Go to Step 4.

STEP 4. Tune then check.

Q: Did the sensitivity improve after tuning?

YES :

There is no action to be taken.

NO :

Go to Step 5.

STEP 5. Check the connection of the antenna
plug and the radio and CD player.

Q: Is the antenna plug thoroughly connected to the

radio and CD player?
YES :

Go to Step 6.

NO :

Thoroughly connect the antenna plug and
the radio and CD player.

STEP 6. Check by replacing the radio and CD
player.

Q: Are operations normal when using another radio

and tape player or CD player?
YES :

Either repair or replace the radio and CD

player.

NO :

Either repair or replace the antenna
assembly.

Inspection Procedure 11: There is noise but no reception for LW/MW/FM or no sound from LW/MW/
FM.

DIAGNOSIS PROCEDURE

STEP 1. Check the state of the antenna.

Q: Is the antenna assembled?

YES :

Go to Step 2.

NO :

Assemble the antenna.

STEP 2. Check to see if inspections are taking
place is an area exposed to special electric
fields.

Q: Are inspections taking place under special electric

field conditions (underground garage, inside a
building, etc).?

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-286

YES :

Go to Step 3.

NO :

Go to Step 4.

STEP 3. Relocate and check.
Automatically receive in a good reception area that is
not exposed to special electric fields.

Q: Is reception of the strongest radio frequency

possible within the area?
YES :

There is no action to be taken.

NO :

Go to Step 4.

STEP 4. Tune then check.

Q: Did the sensitivity improve after tuning?

YES :

There is no action to be taken.

NO :

Go to Step 5.

STEP 5. Check the connection of the antenna
plug and the radio and CD player.

Q: Is the antenna plug thoroughly connected to the

radio and CD player?
YES :

Go to Step 6.

NO :

Thoroughly connect the antenna plug and
the radio and CD player.

STEP 6. Check by replacing the radio and CD
player.

Q: Are operations normal when using another radio

and CD player?
YES :

Either repair or replace the radio and CD

player.

NO :

Either repair or replace the antenna
assembly.

Inspection Procedure 12: Poor reception.

DIAGNOSIS PROCEDURE

STEP 1. Check the state of the antenna.

Q: Is the antenna assembled?

YES :

Go to Step 2.

NO :

Assemble the antenna. Check that a poor
reception is resolved.

STEP 2. Check to see if inspections are taking
place is an area exposed to special electric
fields.

Q: Are inspections taking place under special electric

field conditions (underneath garage, inside a
building, etc).?
YES :

Go to Step 3.

NO :

Go to Step 4.

STEP 3. Relocate and check.
Automatically receive in a good reception area that is
not exposed to special electric fields.

Q: Is reception of the strongest radio frequency

possible within the area?
YES :

Move the vehicle to check the trouble

symptom.

NO :

Go to Step 4.

STEP 4. Tune then check.

Q: Did the sensitivity improve after tuning?

YES :

This diagnosis is complete.

NO :

Go to Step 5.

STEP 5. Check with several broadcasting
stations.
NOTE: Multipath noise and fading noise: Because
the frequency of FM waves is 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.

Q: Is the abnormality in reception generated only

within a certain range?
YES :

Check that a poor reception is resolved.

NO :

Go to Step 6.

STEP 6. Check the connection of the antenna
plug and the radio and CD player.

Q: Is the antenna plug thoroughly connected to the

radio and CD player?