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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 or are blown Check wiring; use VOM/DVM to 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 ~ 18Vdc; temperature is not
(JBL badge on top panel) over 194°F (90°C); there are no short circuits; speaker
is flashing loads are not less than 2 ohms (4 ohms in mono)
Audio cycles off and on; GAIN is set too high Set Input Sensitivity
amber protection LED correctly (see page 5)
(on top panel) is flashing
Fuse blows Incorrect wiring or short circuit Check connections; refer to Applications
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 JBL P-4020 (or P-4040).
Declaration of Conformity
We, JBL Europe A/S
Kongevejen 194B
DK-3460 Birkerød
DENMARK
declare in own responsibility, that the products described
in this owner’s manual are in compliance with technical
standards:
EN
EN
55013/A12/8.1994
55020/12.1994
Steen Michaelsen
JBL Europe A/S
Birkerød. DENMARK. 3/98
P-4020/4040 OM. 7/14/98 11:42 AM Page 7