Troubleshooting - JVC KS-FX12 Service Manual

PRECAUTIONS on power supply and speaker
connections:
• DO NOT connect the speaker leads of the power cord to
the car battery; otherwise, the unit will be seriously
damaged.
• Connect the black lead (ground), yellow lead (to car battery,
constant 12V), and red lead (to an accessory terminal) correctly.
• BEFORE connecting the speaker leads of the power cord to
the speakers, check the speaker wiring in your car.
– If the speaker wiring in your car is as illustrated in Fig. 1
and Fig. 2 below, DO NOT connect the unit using that original
speaker wiring. If you do, the unit will be seriously damaged.
Redo the speaker wiring so that you can connect the unit to
the speakers as illustrated in Fig. 3.
– If the speaker wiring in your car is as illustrated in Fig. 3,
you can connect the unit using the original speaker wiring in
your car.
– If you are not sure of the speaker wiring of your car, consult
your car dealer.
+ +
L
-
-
+ +
R
-
-
Fig. 1
!"#
Connecting the leads /
Twist the core wires when connecting.
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B Connections Adding Other Equipment /
You can connect an amplifier and other equipment to upgrade
your car stereo system.
• Connect the remote lead (blue with white stripe) to the remote
lead of the other equipment so that it can be controlled through
this unit.
• For amplifier only:
– Connect this unit's line-out terminals to the amplifier's line-in
terminals.
– Disconnect the speakers from this unit, connect them to
the amplifier. Leave the speaker leads of this unit unused.
(Cover the terminals of the these unused leads with
insulating tape, as illustrated above.)
!"
Amplifier / /
L
R
Signal cord (not supplied with this unit
! !"#$%
(see diagram
A
A

TROUBLESHOOTING

• The fuse blows.
* Are the red and black leads connected correctly?
• Power cannot be turned on.
* Is the yellow lead connected?
• No sound from the speakers.
* Is the speaker output lead short-circuited?
• Sound is distorted.
* Is the speaker output lead grounded?
* Are the "–" terminals of L and R speakers grounded in common?
• Unit becomes hot.
* Is the speaker output lead grounded?
* Are the "–" terminals of L and R speakers grounded in common?
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–
+
L
-
+
R
-
Fig. 2
/
Solder the core wires to
connect them securely.
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Blue with white stripe
Rear speakers
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INPUT JVC amplifier
L
JVC
JVC
R
LINE OUT
L
L
KS-FX12
REAR
R
R
A ) Front speakers
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-
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-
CAUTION / /
• To prevent short-circuit, cover the terminals of the UNUSED leads with insulating
tape.
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•
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Y-connector (not supplied with this unit)
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Y
Y
Remote lead
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Purple with black stripe / Purple (Not used)
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Green with black stripe / Green (Not used)
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R
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R
KS-F150
KS-FX12
+ +
L
-
-
+ +
R
-
-
Fig. 3
•
To automatic antenna if any
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L
L
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