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8. In Case of Difficulty
Power-on light does not
come on
Power light is on, but no
sound is heard from some
or all of the speakers
• Head unit not on; turn the head unit on.
• Ground wire is disconnected or
defective; check for continuity with an
ohm-meter between the amplifier’s
ground terminal and a know chassis
ground point.
• Battery wire is disconnected or
defective; check approximately +12
volts between the amplifier’s battery
and ground terminals.
• Blow fuse; check amplifier’s located on
the endpanel near the power connector.
If it is blown replace it with an identical
one. If the new fuse blows immediately,
then check all the wiring connection. If
no fault is found, consult your JBL
dealer.
• Remote-on wire between the head unit
and the amplifier is disconnected or
defective; check for +12 volts between
amplifier’s remote-on input terminal
and the ground input terminal with the
head unit on.
• Incorrect switch settings; make sure
that all switchs (input mode and
crossover) are in their correct positions
for your system configuration.
• Incorrectly connected or shorted
speaker wires; check for shorts in
wiring.
• Defective or disconnected audio cables;
check for continuity and replace if
necessary.
• Incorrect Gain Adjustment; verify that
the amplifier gain controls are not
turned completely down. If they are,
sound output level may be very low
and may give the impression that the
system) or part of the system) is dead.
• Defective head unit or signal processor;
check each component for proper
wiring and operation.
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