In Case Of Difficulty - JBL Grand touring series User Manual

In Case of Difficulty
Power-on light does
not come on
l
Head unit not on; turn the head
unit on.
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Ground wire is disconnected or
defective; check for continuity
with an ohmmeter between the
amplifier's ground terminal and
a know chassis around point.
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Battery wire is disconnected or
defective; check for approxi-
mately +12V between the ampli-
fier's battery and ground termi-
nals.
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Blown fuse; check amplifier's
fuse 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 connections. If no
fault is found, consult your JBL
dealer.
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Remote-on wire between the
head unit and the amplifier is
disconnected or defective;
check for +12V between amplifi-
er's remote-on input terminal
and the ground input terminal
with the head unit on.
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Amplifier is in thermal protec-
tion mode due to overheating;
relocate amp for more air flow
and check wiring.
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Incorrect switch settings; make
sure that all switches (input
mode and crossover) are in
their correct positions for your
system configuration.
l
Incorrectly connected or
shorted speaker wires; check
for shorts in wiring.
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Defective or disconnected audio
cables; check for continuity
and replace if necessary.
l
Incorrect gain adiustment; ver-
ify that the amplifier gain con-
trols are not turned comnletelv
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.
l
Defective head unit or signal
processor; check each compo-
nent for proper wiring and
operation.
l
Defective GTSlSOx; if there is
audio signal present at the
inputs of the amplifier and
there is no output, the GTSjSOx
may be defective.
Bower On light is blinking,
indicating a fault condition,
and sound is intermittent
or off
l
Incorrectly connected or
shorted speaker wires; check
for shorts, frayed wiring, dam-
aged wiring insulation or incor-
rect wiring.
l
The swaker combination con-
nected to the amplifier is less
than the minimum reauire-
ment; reconfigure speaker
connection after consulting
with "Speaker Requirements"
on page 6.
l
Amplifier is damaged; consult
your JBL dealer.
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