7
Symptom
Likely Cause
Solution
No audio
Low/no remote on voltage
Check connections; turn-test turn-on voltage
Speakers are not connected
Check wiring; use VOM/DVM to
or are blown
measure speaker-coil resistance
Distorted audio
Input sensitivity is not set properly
See Setting Input Sensitivity on page 5
Audio lacks “punch”
Speakers are wired with wrong polarity
Check polarity of connections;
refer to Applications
Audio cycles off and on;
A protection circuit is turning the
Verify the following: off electrical system is
amber protection LED
amplifier off and on
between 5 ~ 18 Vdc; temperature is not
(JBL badge on top panel)
over 194°F (90°C); there are no short circuits;
is flashing
speaker loads are not less than 2 ohms
(4 ohms in mono)
Audio cycles off and on; amber
GAIN is set too high
Set Input Sensitivity correctly
protection LED (on top panel)
(see previous page)
is flashing
Fuse blows
Incorrect wiring or short circuit
Check connections; refer to Applications
Many different system configurations are
possible using the crossovers and pre-
amp outputs featured in Power Series
amplifiers. If you are considering
expanding you system beyond what is
shown here, please consult your local
JBL installation specialist, who is experi-
enced in designing complex mobile-
audio systems.
Troubleshooting
Use the following guide to identify
symptoms and solve problems. Make
sure the vehicle’s electrical system is
working properly and power is reaching
the amplifier.
P-7520/7540/2510 OM copy 7/14/98 11:46 AM Page 7
