JBL GT5-A402 CAR AMPLIFIER TROUBLESHOOTING AND CIRCUIT DIAGRAM
CAR AMPLIFIER
JBL GT5-A402
TROUBLESHOOTING AND CIRCUIT DIAGRAM
Installation Warnings and Tips
# Disconnect the negative (–) lead from your vehicle’s battery.
# At the installation sites, locate and make a note of all fuel lines, hydraulic brake lines, vacuum lines and electrical wiring. Use extreme caution when
cutting or drilling in and around these areas.
# Choose a safe mounting location away from moisture.
# Make sure there is sufficient air circulation at the mounting location for the amplifier to cool itself.
# Mount the amplifier, using the supplied hardware.
# Disconnect the negative (–) lead from your vehicle’s battery.
# At the installation sites, locate and make a note of all fuel lines, hydraulic brake lines, vacuum lines and electrical wiring. Use extreme caution when
cutting or drilling in and around these areas.
# Choose a safe mounting location away from moisture.
# Make sure there is sufficient air circulation at the mounting location for the amplifier to cool itself.
# Mount the amplifier, using the supplied hardware.
Troubleshooting
1. Status LED on Amplifier not Lit - Head Unit (Source) Turned ON
Verify:
A. Remote turn-on wire from source to amplifier has proper voltage
B. Power (B+) connections at amplifier, terminal blocks, and battery are secure
C. Ground (GND) connections at amplifier and vehicle chassis are secure
D. Battery B+ fuse (if used) is OK
E. Amplifier fuse is OK
F. B+ at battery and B+ at amplifier has proper voltage
2. Status LED’s Lit, No Output from Speakers in Normal Operating Condition
Verify:
A. RCA cables from amplifier to source are securely connected
B. Volume adjustment on amplifier is correctly adjusted
C. Source is ON and playing
3. Engine Noise From Speaker(s)
Turn source OFF, Disconnect RCA cables at amplifier. If noise stops, check equipment & cables leading
to amplifier.
Verify:
A. RCA cables are of good quality with no breakage to internal shields
B. RCA cables from source to amplifier are not run alongside any power cables
4. Amplifier Output Distorted Music
Verify:
A. Source output music to amplifier is not distorted
B. Source output sensitivity is correctly adjusted
5. Amplifier Shuts Down, Green LED’s are Lit - Amplifier is in Thermal Protection Mode
Verify:
A. Amplifier is mounted with adequate air circulation around heatsinks or vents
B. Amplifier is not mounted under carpet or sealed enclosure
C. Speakers meet correct impedance for application (mono or stereo hookup)
6. Amplifier Does Not Turn ON, and Red LED is Lit Amplifier (and not Connected to a Shorted Speaker)
Verify:
A. Speaker crossover (if used) is not defective
1. Status LED on Amplifier not Lit - Head Unit (Source) Turned ON
Verify:
A. Remote turn-on wire from source to amplifier has proper voltage
B. Power (B+) connections at amplifier, terminal blocks, and battery are secure
C. Ground (GND) connections at amplifier and vehicle chassis are secure
D. Battery B+ fuse (if used) is OK
E. Amplifier fuse is OK
F. B+ at battery and B+ at amplifier has proper voltage
2. Status LED’s Lit, No Output from Speakers in Normal Operating Condition
Verify:
A. RCA cables from amplifier to source are securely connected
B. Volume adjustment on amplifier is correctly adjusted
C. Source is ON and playing
3. Engine Noise From Speaker(s)
Turn source OFF, Disconnect RCA cables at amplifier. If noise stops, check equipment & cables leading
to amplifier.
Verify:
A. RCA cables are of good quality with no breakage to internal shields
B. RCA cables from source to amplifier are not run alongside any power cables
4. Amplifier Output Distorted Music
Verify:
A. Source output music to amplifier is not distorted
B. Source output sensitivity is correctly adjusted
5. Amplifier Shuts Down, Green LED’s are Lit - Amplifier is in Thermal Protection Mode
Verify:
A. Amplifier is mounted with adequate air circulation around heatsinks or vents
B. Amplifier is not mounted under carpet or sealed enclosure
C. Speakers meet correct impedance for application (mono or stereo hookup)
6. Amplifier Does Not Turn ON, and Red LED is Lit Amplifier (and not Connected to a Shorted Speaker)
Verify:
A. Speaker crossover (if used) is not defective
Speaker Output Connectors
# Connect the speakers to these terminals, observing proper polarity.
# Two-channel operation: Connect the left speaker to the L+ and L– terminals and the right speaker to the R+ and R– terminals.
# One-channel (bridged) operation: Connect the single speaker to the R+ and L– terminals.
# Minimum speaker impedance for 2-channel operation is 2 ohms. Minimum speaker impedance for 1-channel (bridged) operation is 4 ohms
# Connect the speakers to these terminals, observing proper polarity.
# Two-channel operation: Connect the left speaker to the L+ and L– terminals and the right speaker to the R+ and R– terminals.
# One-channel (bridged) operation: Connect the single speaker to the R+ and L– terminals.
# Minimum speaker impedance for 2-channel operation is 2 ohms. Minimum speaker impedance for 1-channel (bridged) operation is 4 ohms
CIRCUIT DIAGRAM
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