2000 MITSUBISHI MONTERO Service Repair Manual

CHASSIS ELECTRICAL -Radio/Tape Player54A-71
A-3 Broadcasts can be heard but UKW/MW/LW has a lot of noise.
(1)(2)
Noise occurs when theengine is stopped.
YES
Do the following measures eliminate the noise?
DTune to a station with a strong signal.
DExtend the antenna completely.
DAdjust the sound quality to suppresshightones.YES
OK
NO
Is the radio body earth mounted securely?NOSecurely tighten the nuts for the
body earth.
YES
Is the antenna plug properly connected to the radio?NOCorrectly attach the antenna plug.
YES
Is the antenna itself ingood condition or is it properly
mounted?NOClean the antenna plug and earth
wire mounting area. Mount the anten-
na securely.
YES
If there is more noise than other radios, consult a ser-
vice centre.
Is the noise eliminated?
NOYES
OK
Noise occurs when theengine in running.
Inspect the vehicle’s noise suppressor. (Refer to A-4.)


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F
ig . 2 <4M 41> C
ondit io ns C
ause R
em edy U
KW /M W /L W :
I g nit io n nois e
( P oppin g,sn ap-
p in g, cra ckin g,
b uzzin g) O
th er ele ctr ic a l
c o m ponents - N
ois e m ay appear as ele ctr i-
c a lc o m ponents beco m eold -
e r. R
epair or re pla ce ele ctr ic a l
c o m ponents . S
ta tic ele ctr ic it y
( C ra ckin g, crin -
k lin g) O
ccu rs when parts or w ir in g
m ove fo r so m e re aso n and
c o nta ct meta l parts of th e
b ody. R
etu rn parts or wir in g to
t h eir pro per posit io n. D
ue to deta ch m ent fr o m th e
b ody of th e fr o nt hood,
b um pers , exh aust pip e and
m uff le r, su sp ensio n, etc . T
ig hte n th e mountin g bolt s
s e cu re ly . Case s where th e
p ro ble m is note lim in ate d by
a sin gle re sp onse to one
a re a are co m mon, due to
s e ve ra l body parts bein g
i m perfe ctly earth ed.

F
ig . 4 E
nsu re pro per co nnectio n. Y
ES D
oes nois e appear when th e ra dio sw it c h is tu rn ed on while
t h e ve hic le is sto pped and th e ra dio is str u ck while tu ned
a w ay fr o m asta tio n? N
O S
ta tic ele ctr ic it y nois e :
B ody sta tic ele ctr ic fr o m th e sh ock abso rb er ru bber bush in gs
u se d to pre ve nt vib ra tio n, ty re s, etc . occu rs beca use of se pa-
r a tio n fr o m th e earth , ca usin g a buzzin g nois e . Sin ce no mea-
s u re s ca n be ta ke n on th e ra dio sid e, oth er ste ps sh ould be
t a ke n to dis ch arg e th e sta tic ele ctr ic it y of th e ve hic le body. Y
ES I
s th e ra dio co rre ctly earth ed? (Is th e mountin g scre w tig ht-
e ned se cu re ly ? ) N
O T
ig hte n th e scre w se cu re ly . Y
ES I
s th e ante nna co rre ctly earth ed? (If nois e appears when th e
a nte nna is move d, th is means th e earth is not se cu re ly co n-
n ecte d.) N
O I
f ru st is pre se nt at th e ante nna earth scre w , cle an and tig hte n
t h e earth se cu re ly . Y
ES R
epair or re pla ce ra dio .
A -6 Ever-p re sen t nois e.

CHASSIS ELECTRICAL -Radio/Tape Player54A-74
B. RADIO
B-1 No power is supplied when the switch is set to ON.
Is dedicated fuse No. 6 blown or is the circuitopen?YESReplace fuse or repair harness.
NO
Is the connector at the back of the radio connected properly?NOConnect connector securely.
YES
Disconnect and check the connector at the rear of the radio.
Is the ACC power (12 V)being supplied to the radio?NORepair harness.
YES
Repair or replace radio.
B-2 No sound from one speaker.
Check to see if there is any sound
when attached to another radio.YESRepair or replace radio.
NO
Remove the connector on the back
of the radio and check the speaker
harness for conductance.YESIt conducts electricity but is shorted
out.Repair speaker harness.
NO
Check the speaker for conductance.YESRepair speaker harness and ensure
proper connection of relay connec-
tors.
NO
Repair or replace speaker.


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CHASSIS ELECTRICAL -Radio/Tape Player54A-75
B-3 There is noise but no reception for UKW/MW/LW or no sound from UKW/MW/LW.
OK
Is the checkbeing conducted under
special electrical field conditions?YES
Example: In an under-
ground garage or inside a
building.
NO
Does tuning solve the problem?
Is proper performance obtained when
the vehicle is moved?YES
OKYES
NO
NO
ReconnectNOAre the antenna plug and radio unit properlycon-
nected?
YES
Repair or replace radio.YESDoes the problem disappear if connected to another
radio?
NO
Replace the antenna.
B-4 Insufficient sensitivity.
NO
Replace the antenna.
YES
Repair or replace radio.YESDoes the problem disappear when a different radio is
connected?
OK
Is the checkbeing conducted under
special electrical field conditions?YES
Example: In an under-
ground garage or inside a
building.
NO
Does tuning solve the problem?
Is proper performance obtained when
the vehicle is moved?YES
OKYES
NO
NO
Electrical field condition relatedYESIs the problem limited to the reception of a specific
radio station from a specific position?
NO
Ensure proper connection.NOIs the antenna plug properly connected to the unit?


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CHASSIS ELECTRICAL -Radio/Tape Player54A-76
B-5 Distortion on UKW/MW/LW.
How much distortion is there?OccasionalDistortion in the vicinity of the radio
stationYESExcessiveantenna input
Constant
NO
Are the speaker cords in contact with the cone paper?YESRemove cords away from cone paper.
NO
Remove the speakers and check for torn cone paper or for-
eignobjects.YESRepair or replace speakers.
NO
Check for deformation with speaker installed.YESInstall speaker securely.
NO
Repair or replace radio.
B-6 Too few automatic select stations.
OK
Is the checkbeing conducted under
special electrical field conditions?YES
Example: In an under-
ground garage or inside a
building
NO
Is the antenna plug properly connected to the equip-
ment?
Is proper performance obtained when
the vehicle is moved?
Ensure proper connection.NO
NO
YES
Repair or replace radio.YESDoes the equipment work properly if the radio is
changed?
NO
Replace the antenna.YES


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CHASSIS ELECTRICAL -Radio/Tape Player54A-77
B-7 Insufficient memory (preset stations are erased).
Is dedicated fuse No. 5 blown or is the circuitopen?YESReplace fuse or repair harness.
NO
Disconnect and check the connector at the rear of the radio.
Is the memory backup (battery) powerbeing supplied?NORepair harness.
YES
Repair or replace radio.
C. TAPE PLAYER
C-1 Cassette tape will not be inserted.
Are there any foreign objects in the tape player?YESRemove the object(s)*1.
NO*1
Attempting to force a foreign object (e.g., a coin or clip, etc.)
out of the tape player maydamage the mechanism. The
player should be taken to a service dealer for repair.
Does the tape player work if another tape is inserted?YESReplace tape*2.
NO
Repair or replace tape player.
*2
Ensure that the tape label is not loose, that the tape itself is
not deformed and that the tape is tightly wound. Also, tape of
C-120 or greater length often get caught in the mechanism
and should not be used.
C-2 No sound (even after a tape has been inserted).
Is dedicated fuse No. 6 blown or is the circuitopen?YESReplace fuse or repair harness.
NO
Is connector at rear of radio connected tightly?NOConnect connector firmly.
YES
Disconnect connector at rear of radio. Is ACC powerbeing
supplied to the radio?YESRepair or replace tape player.
NO
Repair harness.


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CHASSIS ELECTRICAL -Radio/Tape Player54A-78
C-3 No sound from one speaker.
Clean the tape playerhead andcheck again.YESOK
NO
Replace the tape player and check again.YESRepair or replace tape player.
NO
Remove the connector on the back of the radio and
check the speaker harness for conductance.YESIt conducts electricity but is
shorted out.Repair harness.
NO
Check the speaker for conductance.YESRepair harness.
NO
Repair or replace speaker.
C-4 Sound quality is poor, or sound is weak.
Does the player play properly when another tape* is inserted?YESOK
NO
*:
DEnsure that the tape label is not loose, that the
tape itself is not deformed and that the tape is
tightly wound.
DTapes of C-120 or greater length often get caught
in the mechanism and should not be used.
Does the player play properly when the tape playerhead is cleaned?YESOK
NO
Is proper operation obtained when the tape player is replaced?YESRepair or replace tape player.
NO
Repair or replace speaker.
C-5 Cassette tape will not be ejected.
The problems covered here are all the result of
the use of a bad tape (deformed or not properly
tightened) or of a malfunction of the tape player
itself. Malfunctions involving the tape becoming
caught in the mechanism and ruining the case arealso possible, and attempting to force the tape out
of the player can cause damage to the mechanism.
The player should be taken to a service dealer
for repair.


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