EN
TROUBLESHOOTING
No audio and POWER INDICATOR is off.
• No voltage at BATT+ and/or REM terminals, or bad or no
ground connection. Check voltages at amplifier terminals
with VOM.
No audio and PROTECT INDICATOR flashes every 4
seconds.
• DC voltage on amplifier output. Amplifier may need service;
see enclosed warranty card for service information.
No audio and PROTECT and POWER INDICATORS flash.
• Voltage less than 9V on BATT+ connection. Check vehicle
charging system.
No audio and PROTECT INDICATOR is on.
• Amplifier is overheated. Make sure amplifier cooling is not
blocked at mounting location. Or, there may be voltage
greater than 16V (or less than 8.5V) on BATT+ connection.
Check vehicle charging system.
Amplifier fuse keeps blowing.
• The wiring is connected incorrectly or there is a short circuit.
Check wiring connections.
Distorted audio.
• Gain Is Not Set Properly. Check Setting. Check Wires
For Shorts Or Grounds. Amplifier Or Source Unit May Be
Defective.
Distorted audio and PROTECT INDICATOR flashes.
• Short circuit in speaker or wire. Remove speaker leads one at
a time to locate shorted speaker or wire, and repair.
Music lacks dynamics or "punch".
• Speakers are not connected properly. Check speaker
connections for proper polarity.
Engine noise—whining or clicking—in system when the
engine is on.
• Amplifier is picking up alternator noise. First, check ground
connection on the amplifier – a loose or improper ground is
one of the main causes for noise. Turn down gain. Move RCA
audio cables away from power wires. Installing an alternator
noise filter on power line between battery and alternator might
also be necessary.
HARMAN International Industries,
Incorporated 8500 Balboa Boulevard,
Northridge, CA 91329 USA
www.jbl.com
© 2019 HARMAN International Industries, Incorporated. All rights reserved.
JBL is a trademark of HARMAN International Industries, Incorporated,
registered in the United States and/or other countries. Features, specifications
and appearance are subject to change without notice.
