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A400HLX, A600HLX
13
Troubleshooting
Problem Possible Cause Corrective Action
Amplifier does not operate
(power LED not on) when
vehicle and radio are on
Radio volume needs to be
turned up too high for amp
to work
Radio volume is too sensitive
Sound from only one speaker
Sound distorted
Blows fuses
Engine noise
(Ignition noise/static or
Alternator whine)
Protect light comes on/
amplifier shuts down
No output on channels
No power to +12V terminal
No power to remote wire with
radio on
Fuse blown
Input level control adjusted too low
Input level control adjusted too high
Defective speaker
Poor connections to speaker (wire)
RCA input cable defective
Input level control adjusted too high
Speaker wires shorting together
Power wires hooked up incorrectly
Speakers blown or defective
Improper ground connections
Ground loop(s)
Amp is in thermal protection
Faulty speaker connection and/or
crossover
Low battery voltage
Speaker impedance less than 2 ohms
per channel
Speaker wires not connected to
speakers properly
Input hooked up incorrectly
Repair wire or connections.
Check connections to radio with test light.
Check fuse.
Adjust input level control.
Adjust input level control to lower setting.
Replace speaker.
Check connections.
Replace cable.
Adjust input level control.
Separate speaker wires and insulate.
Check power wire connections.
Check speakers.
Reroute RCA away from main power wires.
Reroute RCA cable.
Make sure amp is grounded to a clean, solid part of
the chassis/frame.
Let amp cool down before attempting to turn back on
(some installations may require a fan to keep the amp
cool, especially if you are driving subwoofers with the
amp).
Check speakers and/or crossovers for loose or bad
connections.
Make sure you are getting between 10.8-15.6 volts to the
amplifier with a digital multimeter measured at the amplifier.
If you are using 4 ohm speakers you cannot have more
than two speakers wired in parallel per channel.
Amp will not operate into 2 ohms bridged.
Refer to pages 6 – 9 for proper installation.
REC002_A4n600HLX_E 1/9/02, 4:13 PM13