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TROUBLESHOOTING
If
your
amplifier isn't performing the way you think it should, check to
see
if the problem is covered in this section
before calling your dealer or contacting JBL
customer
service.
PROBLEM
No
sound
(the amplifier's
Power/ Protection LED is
off):
No
sound
(the
amplifier's
Power/
Protection LED
is
orange):
No
sound
(the
amplifier's
Power/ Protection
LED
is
red):
Sound only comes
from
some of
the
speakers
connected to the
amplifier:
Sound
is too
quiet, even with
the
vehicle
audio system's
head
unit
volume
turn
ed
all
the
way
up:
Sound in
the
front/rear speakers
is
distorted:
Sound in
the
subwoofer
is
distorted
:
The amplifier's
Gain
LEOs
constantly
illuminate
red
while
the
amplifier is operating
:
CAUSES AND SOLUTIONS
• Check that the amplifier's + 12V and GND connections have been
properly
made.
• Check if the fuse on the
+
12V
wire
located near the
battery
is blown; if
so,
replace it
with
an identical fuse
.
•
Check
all
amplifier fuses;
if
any
are blown,
replace them
with identical
fuses.
• If
you are using the amplifier's
REM
connection for
t
urn-on, check
that the
wire is
properly connected
to
the audio
system's
remote
turn-on
wire or to
t he
vehicle's
ACC
power terminal.
• If
you are using
the amplifier's
Auto
Turn-On
circuit for
turn-on, check that
t
he
amplifier's Auto Turn -On
switch
(on
the amplifier's
bottom
panel) is set
in the
"On"
position.
o
Check that all amplifier
input
and speaker
connections
have
been
properly
made.
o
Check that the
amplifier's Gain controls
are
not turn
ed
all
the
way
down.
o
Check that the vehicle audio
system's
source unit's
volume
control
is
not
turned
all the
way down.
•
Confirm that the vehicle's electrical
system is
supplying between 9V and
16V
DC to
the
amplifier. If the
supp ly
voltage
is
outside of
this
range, correct the
condition
before
attempting
to use
the
amplifier.
o
If
the
amplifier
has
overheated
,
wait
until
it has
cooled
down
before
attempting
to
use it
again
.
• Disconnect
all speakers
from the
amplifier
and
attempt
to turn it on again:
-If the
amplifier
turns
on (the Power/Protect
LED
is orange),
there is
a
short
circ
uit in
one or more of the speaker wires.
Correct
all
short circuits before
reconnecting
the
speakers
to
the
amplifi
er.
-
If
the
amplifier
does
not turn on
(the
Power/
Protect LED
is
still
red), contact
your authorized
JBL
dealer
for assistance.
•
Check
that the
settings
of
the
amplifier's
Input Routing
switches match
the
input
and speaker
connections
made
to the
amplifier.
o
Check that the vehicle audio system
's
source
unit's
balance and
fader
controls
are set
to
their center
(midpoint)
positions.
o
Chec
k
the
amplifier's
Input Level
switch.
If it
is
set
to
"Hi1
,"turn
the
amplifier's
Gain
controls
all
the way down
and
reset
the
Input Level
switch
to "Low."
Then
perform
the
Set
the
Gain procedure, on
page
9, again.
• If
the
amplifier
channels'
Input
Level
switc
h
is
set in
the
"Low"
position, change
the
setting
to
"Hi1" and perform
the
Set the
Gain
procedure, on
page
9
,
again
for those channels.
o
Make
sure amplifier's
Crossover Filter selector for
the distorted
channels is
set
to
HP.
•
Set
the
distorted
channels'
Crossover control
to
a higher setting.
o
Check
that
the
distortion
is
not
originating
from
the vehic le aud io system's
source
unit.
• If the
amplifier's
Input Level
switch
is
set in
the
"Low" position,
change
the
setting
to
"Hi1
"
and
perform
the
Set
the
Gain
procedure,
on
page 9,
again
for
those channels
.
•
While
listening
to
bass-heavy music,
turn
the
Bass
Boost
control all
the way
d
own,
and
then
gradually
increase
it until
the
distortion
begins to
return.
Red uce
the
Bass
Boost
control
setting slightly to
eliminate
the distortion
and
leave
it
set
there.
o
Check that
the
distort ion
is
not
originating
from
the vehicle audio system's
source
unit.
o
Set
the
amplifier's
Gain
LEOs
switch in
the
"Off" position.
W>"
W.Jb l.com
11
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