1992 MITSUBISHI 3000GT radio antenna

Downloaded from www.Manualslib.com manuals search engine 54-166CHASSlS ELECTRICAL - Radio and Tape Player
IA-7Some noise appears when there is vibration or shocks during traveling.
‘d ~
Are connectors properly connected?
YesNo
---+ Ensure proper connection
t
Does noise appear when the radio switch is turned on while theNovehicle is stopped and the radio is struck while tuned away fromLa station?
YesStatic electricity noise:
Body static electric from the shock absorber rubber bushings used
to prevent vibration, tires, etc. occurs because of separation fromthe ground, causing a buzzing noise.
Since no measures can be taken on the radio side, steps shouldbe taken to discharge the static electricitv of the vehicle bodv.
tIs the radio correctly grounded?
(Is the mounting screw tightened securely?)
1 Yes
tIs the antenna correctly grounded? (If noise appears when the Nocantenna is moved, this means the ground is not securely con-
nected.)
If rust is present on the antenna ground screw, clean and tightenthe ground securely.
Yes
1 Reoair or reolace radio.1
TSB Revision

Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Radio and Tape Player54-167
A-8Noise sometimes appears on FM during traveling.
NoIs the antenna completely extended?
Yes
t Check the antenna itself.
(Refer to E-l, 2.)
+Does the problem clear up whenre
1 No
Yes
iDoes the problem appear only in certain locations and only with yes
certain stations?
No
~ Due to electrical field conditions. (Multipath
noise*, fading noise*).
Are connectors property connected?
Yes
Check connector connections.1
tDoes noise appear when the radio switch is turned on while the
vehicle is stopped
and the radio is struck while tuned away froma station?
Yes
No*Static electricity noise:Sody static electric from the shock absorberrubber bushings used to prevent vibration, tires,etc. occurs because of separation from the
ground, causing a buzzing noise.
Since no measures can be taken on the radioside, steps should be taken to discharge the
static
electricitv of the vehicle bodv.
Is the radio body correctly grounded?
No(Is the mounting screw tightened securely?
)
Yes
-) Tighten the screw securely.I
Is the antenna correctly grounded? (If noise appears when the antennais moved, this means the ground is not securely connected.)
Yes
If rust is present on the antenna ground screw,clean and tighten the ground securely.
*
1 Repair or replace radio.1
About multipath noise and fading noise
Because the frequency of FM waves is extreme-
ly high, it is highly susceptible to effects from
geological formations and buildings. These ef-
fects 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 obstruc-
tion 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 is disrupted by obstructing ob-
jects and the signal strength fluctuates intricately
within a narrow range.
1 TSB Revision

Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Radio -and Tape Player54-169
There is noise but no reception for both AM and FM or no sound from AM, or no sound from FM.
Example: in an underground garage or
Is proper performance
hicle is moved?
tt
Is the antenna completely extended?
YesNo
Check the antenna itself.-W (Refer to E-l, 2.)
Does tuning solve the problem?
Yes
NO
tNoAre the antenna plug and radio unit properly connected?
Yes
- Reconnect1Does the problem disappear if connected to another radio?
No
Repair or replace radio.1t
Repair or replace the antenna.
(Refer to E-l, 2.)
i:TSB Revision

Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Radio and Tape Player
Is proper performance’obtained when the ve-pziT---wm
4tIs the antenna completely extended?
YesNoCheck the antenna itself.
(Refer to E-l, 2.)
t
NoYes
Is the problem limited to the reception of a specific radio station yes)Electrical field condition related*.from a specific position?(multipath noise or fading noise)
No
iIs the antenna plug properly connected to the unit?
Yes
Ensure proper connection.Does the problem disappear when a different radio is connected?Repair or replace radio.
Repair or replace the antenna.
(Refer to E-l, 2.)
*For multipath noise and fading noise prob-
lems, refer to P.64-167.
1 TSB Revision

Downloaded from www.Manualslib.com manuals search engine 54-172CHASSIS ELECTRICAL - Radio and Tape Player
B-7Too few automatic select stations.
tIs the antenna completely extended?
YesNo1Check theantennaitself.Is the antenna plug properly connected to the equipment?
Yes
Ensure proper connection.Does the equipment work properly if the radio is changed?
Repair or replace radio.
B-8lnsuff icient memory (preset stations are erased).Is multi-purpose fuse No. 19 blown or is the circuit open?
NoReplace fuse or repair harness.
Disconnect and check the connector at the rear of the radio. Is the memory
backup (battery) power beina supplied?Repair harness..-IYes
tRepair or replace radio.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Radio and Tape Player54-181
E. MOTOR ANTENNA
LE-lMotor antenna won’t extend or retract.
Clean and polish the surface of the antenna rod.Is the radio power switch ON?
Yes
Switch it ON.Is voltage (approx. 12 V) emitted to the radio’s motor antenna terminal’?
YesRepair or replace the radio.i
tIs the antenna bent?
No
tIs the antenna relay OK?
Yes
Replace the antenna relay.
iIs the motor OK?
YesNo
c
Repair the harness.I-
TSB Revision. Replace the motor.

Downloaded from www.Manualslib.com manuals search engine 54-182CHASSIS ELECTRICAL - Radio and Tape Player
E-2Motor antenna extends and retracts but does not receive.Is the antenna’ itself OK?
YesRepair or replace it.
Is operation normal when a new antenna assembly is directly installedto the radio?
YesRefer to B. “Radio troubleshooting”.
/ Replace the feeder cable.
Hz+
216N0087-IChecking the antenna
*
Ohmmeter measurement locations
Circuits from F to A, B, C, D and E
Circuit between G and H
Circuits from H to A, B, C, D and E
Result
Continuity
Continuity
No continuity
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Downloaded from www.Manualslib.com manuals search engine 54-188CHASSIS ELECTRICAL - Radio and Tape Player
MOTOR ANTENNA
/ ANTENNA FEEDER CABLE / AMPLIFIER
REMOVAL AND INSTALLATION

Motor antenna removal stepsl Rear side trim (LH)
(Refer to GROUP 52A
- Trims.)
1. Ring nut
2. Base
3. Antenna pole
4. Antenna feeder cable and motor antenna
connection5. Motor antenna
Amplifier removal
il. Amplifier (under passenger’s seat)
NOTE
l ‘: Refer to GROUP 52A - Trims‘*: Vehicels with glass mounted antenna
\Z16FO4974
Antenna feeder cable removal stepsl Rear side trim
(LH)*ll Quarter trim (LH)”
l Rear side trim*‘, **l Quarter trim (LH)*t, **l Quarter upper trim”, l *0 Liftgate upper trim*‘, +*l Ligate side trim (RH)“, l *l Rear console assembly(Refer to GOUP 52A - Console Box.)l Radio and tape player(Refer to P54-176)4. Antenna feeder cable and motor antennaconnection6. Rear seat cushion7. Rear seatback8. Inner seat belt
9. Console side cover (LH)
10. Antenna fedder cable
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