Mitsubishi Pajero Pinin. Manual — part 333
CHASSIS ELECTRICAL –
Radio and Tape Player
54A-48
RADIO AND TAPE PLAYER
TROUBLESHOOTING
QUICK-REFERENCE TROUBLESHOOTING CHART
Items
Problem symptom
Relevant chart
Noise
Noise appears at certain places when travelling.
A-1
Mixed with noise, only at night.
A-2
Broadcasts can be heard but FM/MW/LW has a lot of noise.
A-3
There is noise when starting the engine.
A-4
Some noise appears when there is vibration or shocks during
travelling.
A-5
Ever-present noise.
A-6
Radio
When switch is set to ON, no power is available.
B-1
No sound from one speaker.
B-2
There is noise but no reception for FM/MW/LW or no sound from
FM/MW/LW
B-3
Insufficient sensitivity.
B-4
Distortion on FM/MW/LW.
B-5
Too few automatic select stations.
B-6
Insufficient memory (preset stations are erased).
B-7
Tape player
Cassette tape will not be inserted.
C-1
No sound.
C-2
No sound from one speaker.
C-3
Sound quality is poor, or sound is weak.
C-4
Cassette tape will not be ejected.
C-5
Uneven revolution. Tape speed is fast or slow.
C-6
Faulty auto reverse.
C-7
Tape gets caught in mechanism.
C-8
CHASSIS ELECTRICAL –
Radio and Tape Player
54A-49
CHART
A. NOISE
A-1 Noise appears at certain places when travelling.
Is there a particular structure?
No
Do the following measures eliminate
the noise?
1. Change to a different station with
a strong signal to boost resistance
to interference.
2. Suppress high tones to reduce
noise.
3. Extend antenna completely.
Yes
OK
Yes
Find out the following information from
the user:
1. Place
2. Locality conditions (valley, moun-
tain, etc.)
3. Name and frequency of stations
affected by noise
No
If due to vehicle noise:
It may not be possible to prevent noise
if the signal is weak.
If there is more noise than other radios, find out the noise
conditions and the name and frequency of the receiving
stations from the user, and consult with the service centre.
If due to external noise:
In almost all cases, prevention on the
receiver side is impossible. Weak sig-
nals especially are susceptible to inter-
ference.
CHASSIS ELECTRICAL –
Radio and Tape Player
54A-50
A-2 Mixed with noise, only at night.
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
interference 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 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.
2.
Factors due to vehicle noise: Alternator noise
may be a cause.
Is the noise still obvious even with the
lamps OFF?
No
Yes
Do the following measures eliminate
the noise?
D
Tune to a station with a strong
signal.
D
Tune to a station with a strong signal
without completely extending the
antenna.
Yes
OK
No
Does the noise fade away when the
vehicle harness is moved away from
the radio chassis? (if the harness is
not in the proper position.)
Yes
OK
No
If there is more noise than other radios, consult a service
centre.
CHASSIS ELECTRICAL –
Radio and Tape Player
54A-51
A-3 Broadcasts can be heard but FM/MW/LW has a lot of noise.
(1)
(2)
Noise occurs when the engine is stopped.
Yes
Do the following measures eliminate the noise?
D
Tune to a station with a strong signal.
D
Extend the antenna completely.
D
Adjust the sound quality to suppress high tones.
Yes
OK
No
Is the radio body earth mounted securely?
No
Securely tighten the nuts for the body
earth.
Yes
Is the antenna plug properly connected to the radio?
No
Correctly attach the antenna plug.
Yes
Is the antenna itself in good condition or is it properly
mounted?
No
Clean the antenna plug and earth wire
mounting area. Mount the antenna se-
curely.
Yes
If there is more noise than other radios, consult a service
centre.
Is the noise eliminated?
No
Yes
OK
Noise occurs when the engine in running.
Inspect the vehicle’s noise suppressor. (Refer to A-4.)
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