11
TROUBLESHOOTING
SYMPTOM
LIKELY CAUSE
SOLUTION
No audio
No voltage at power
Check BATT+, REMOTE and
(Power LED is off)
or remote terminal
GND – terminals with VOM for
blown fuse or poor connection
Internal fuse blown
Replace internal fuse
(incorrect power
(see Replacing the Fuse
connections)
or Neon Tubes section)
No audio
Low or high voltage
Check BATT+ terminal with
(Power LED
at power terminal
VOM for voltage between
is flashing)
10 and 16 Vdc; if not within
limits, check vehicle’s
electrical system
No audio
Direct current on
Disconnect cable from
(Power and
speaker output(s)
REMOTE terminal; if Fault LED
Fault LEDs
is still on, contact local JBL
are on)
service center
No audio
Internal amplifier
Check for blocked vents
(Power and
temperature is over
or whether the ambient
Thermal LEDs
85° C
temperature is above 85° C
are on)
Distorted audio
Amplifier’s gain is
Properly adjust the
(I OPT and/or
set to High
LEVEL control (see
E OPT LED[s]
Setting Input
are on more
Sensitivity section)
than off)
Distorted audio
Defective source unit
Try new source unit
(I OPT and/or
E OPT LED[s]
Shorted speaker
Disconnect wires from
work correctly)
wires
SPEAKER OUTPUTS and
check for shorts between
wires, or between a wire and
the vehicle’s chassis
Music lacks
Speakers are out
Check speaker connections
“punch”
of phase
(see sections on speaker
connections)
Wrong output mode
Verify output mode setting
(see Making the Connections
section)
Neon tubes do
No voltage to neon tubes
Check LIGHTING
not light
for +12 Vdc
terminal with VOM
Neon tubes are dead
Replace neon tubes
(see Replacing the Fuse
or Neon Tubes section)
3000 Watts Parallel Bridge
Thermal
CH 1
CH 2
Signal
-18 dB
-9 dB
E Opt
I Opt
Power
Fault
A3000GTi
6000 Watts Parallel Bridge
Power
Thermal
Signal
-18 dB
-9 dB
E Opt
I Opt
Fault
A6000GTi
Figure 18.
Display indicates Power Output and Protection status.
