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16 APX2120/APX4240/APX1300
6. Troubleshooting
No Audio
• Low or no remote turn-on voltage: check remote connections at the amplifier and
source unit.
• Blown amplifier fuse: replace with a new fast-blow fuse (same rating).
• Power wires not connected: check battery and ground wiring at the amplifier and
check the battery connections.
• Speaker leads shorted: check speaker continuity to ground; it should not show a
common ground.
• Speakers not connected or are blown: check speaker connections at the amplifier;
measure coil impedance.
Audio cycles on and off
• Thermal protection circuits are shutting the amplifier off.
• Check the location for adequate ventilation. Consult an authorized Clarion audio
dealer.
Distorted audio
• Gain is not properly set or the speaker cones are damaged.
• Review the instructions for setting the gain. Inspect each speaker cone for signs of
damage, such as a frozen cone, burning smell, etc.
Amplifier fuse keeps blowing
• The wiring is connected incorrectly or there is a short circuit.
• Review the installation precautions and diagram in this manual and check all wiring
connections.
Whining or ticking noise when engine on
• The amplifier is picking up alternator or radiated noise.
• Turn down input gain.
• Move the audio cables away from the power wires.
• Check the power and ground connections on the amplifier and install an in-line
noise filter on the source unit’s power wire.
• Check the alternator and/or voltage regulator. Test for a weak battery or add water
to the battery.
AMPSOwnersManual.pmd 2005-12-13, 17:0216