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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