1994 MITSUBISHI 3000GT Workshop Manual

Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Radio and Tape Player54-153
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HR14M07AB

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CIRCUIT DIAGRAM (CONTINUED)
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iCHASSIS ELECTRICAL
- Radio and Tape Player54-155
COMPONENT LOCATIONMotor antenna control unit ___
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CHASSIS ELECTRICAL - Radio and Tape Player
RADIO AND TAPE PLAYER WITH ANTI-THEFT SYSTEM
lWhen power supply is reconnected after set has been removed from vehicle (after BATT line of sethas been disconnected for more than one hour), what can be effectively performed is only supply
of power made by POWER button operation. (If power supply is connected within an hour, operating
state before disconnection of power supply is resumed.)
IGN key of vehicle is in ACC position and set is in no displaystate.
No displayAbnormal segment op-
*[Faulty
tIs it possible to set identifiNom-Faulty
Yes
Is a beep heard and then does radio operate when PROG button
is placed to ON position after setting four-digit identification numberIs a beep heard and “1 Err” displayed for two seconds before
No
displaying “code”?cFaulty set
No
tCheck if identification number on card is input and set correctly.
Is a beep heard and then does radio operate when PROG button
is placed to ON position after setting four-digit identification numberon card aaain?
Yes-----+ NomxJ (Error made in input during first setting)
I
NoIs a beep heard and “2 Err” displayed for two seconds before
displaying “code”?Faulty set
YesPress POWER button to erase “code” (to change to no display
state).
I
YesContinued to next page.
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Continued from previous Page
I
Is changeoverto normal operation made by placing POWER buttonto ON position while pressing EJECT button?
YesFaulty set
tIs power supply cut off automatically to return to no display state
after three-minute operation?Faulty set
Does manufacturing numberof set agree with identification number
on card?
YesError in attaching card (For set manufacturing number identificationlocation, refer to
F!54-183)
Yes
Is a beep heard and does radio operate when identification number - Normal (Error in first and second setting)indicated on card is reset and PROG button is placed to ON
position?
No
Is “OFF” displayed after three-minute beeping togetherwith displayof “3 Err”?Faulty set
Yes
t
0In this state, only POWER button operation is accepted (“OFF’is displayed) and no other button opera-
tion can be made effectively.l
In the “OFF” state, continuation of the BAlT, ACC line ON state for more than one hour will allow identi-
fication number checking operation again and placing the POWER button to ON position will display
“code” and wait for input.
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TROUBLESHOOTING CHART
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CHARTA. NOISE
A-l
Noise appears at certain places when traveling (AM).Is there a particular
stFind out the following information from the user:
1. Place
h YesDo the following measures eliminate the noise?
1. Change to a different station with a strong signalto boost resistance to interference.
2. Suppress high tones to reduce noise.
No
2. Locality conditions (valley, mountain, etc.)3. Name and frequency of stations affected by noise
tIf due to vehicle noise:
It may not be possible to prevent noise if the
signal is weak.
-I
t1 If due to external noise:
In almost all cases, prevention on the receiver
Weak signals especially are susceptible to inter-
i
tIf 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 center.
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A-2Noise appears at certain places when traveling (FM).Do the following measures eliminate the noise?
YeslChange to a different station with a strong signal to boost resistance to interference.l Suppress high tones to reduce noise.+3cll Extend antenna completely. (Whip antenna)
No
tIf 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 center.
NOTE
About FM waves:
FM waves have the same properties as light, and
can be deflected and blocked. Wave reception isnot possible in the shadow of obstructions such
as buildings or mountains.
1.The signal becomes weak as the distance from
the station’s transmission antenna increases.
Although this may vary according to the signal
strength of the transmitting station and interven-ing geographical formations or buildings, the
area of good reception is approx.
20-25 km
(12-l 6 miles) for stereo reception, and 30-40km (19-25 miles) for monaural reception.
2. The signal becomes weak. when an area of
shadow from the transmitting antenna (places
where there are obstructions such as mountains
3.
4.
or buildings between the antenna and.the car),
and noise will appear. and gives a steady buzzing noise.>
If a direct signal hits the antenna at the same
time as a signal reflected by obstructions such
as mountains or buildings, interference of the
two signals will generate noise. During traveling,
noise will appear each time the vehicle’s anten-
na passes through this kind of obstructed area.The strength and interval of the noise varies
according to the signal strength and the condi-tions of deflection.
noise, and is a repetitious buzzing.>Since FM stereo transmission and reception
has a weaker field than monaural, it is often
accompanied by a hissing noise.FM Broadcast Good Reception Areas
FM Signal Characteristics and Signal Interference
For home stereos:80-90 km (SO-56 miles):.:,.::..:,.::.‘; .: ‘, “.‘l’.. ”216AO664Z16A066300002401
Iji
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