NVX JAD900.5 - TROUBLESHOOTING; Power and Output Issues; Protection LED and Overheating; Noise and Audio Quality

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If your amplier does not appear to be working, check the obvious things rst such as blown
fuses, poor or incorrect wiring, setting of the crossovers, source unit, gain setting, etc. There
is a power LED indicator on the side of the amplier denoting the power state of the amplier
in addition to the protection LED. Green status is working and Red signies the amplier is in
protect mode.
Power LED not illuminated? With a multimeter check the following: 1) +12 volt power terminal
should read between +12V to 16V. 2) Remote turn-on terminal should read the same as +12
volt. 3) Check for reversed power and ground connections. 4) Ground terminal for proper
conductivity. 5) Check for blown fuses.
Power LED illuminated, no output? Check the following connections: 1) RCA connections.
2) Test speaker outputs with a known operating speaker. 3) Substitute stereo sound source
with a known operating source unit. 4) Check for a signal in the RCA cable, if needed run a
new cable on the outside of the vehicle.
Protection LED illuminated red? 1) If amplier is very hot to the touch and thermal protection
is engaged. Test for proper impedance at the speaker terminals with a multimeter. Check for
adequate airow around the amplier. 2) If amplier shuts down while the vehicle is running,
the voltage protection is engaged and voltage to the amplier is not within the 10-16 volt
operating range. Have the vehicle’s charging and electrical system inspected. 3) If amplier
will only play at low volume levels, the short circuit protection is engaged. Check for speaker
wires shorted to each other or the vehicle chassis. Check for damaged speaker(s) operating
below the minimum recommended impedance.
Alternator/Generator noise-whining sound with engines RPM? 1) Check for damaged RCA
cables. 2) Check the routing of the RCA cables (do not run signal and power cables parallel
to each other). 3) Check the source unit for proper grounding. 4) Check the gain settings and
turn them down if they are set too high.
Ground noise? NVX ampliers are engineered to be fully compatible with all manufacturer’s
stereo head units. Some head units may require additional grounding to prevent noise from
entering the audio signal. If you are experiencing this problem with your head unit, in most
cases running a ground wire from the RCA outputs on the head unit to the chassis will remedy
this issue.
Reduced bass response? Reverse a speaker connection from positive to negative on the
subwoofer terminals, if the bass improves, the speaker was out of phase.
Warning!
NVX components are capable of producing sound levels that can permanently damage your
hearing! Turning up a system to a level that has audible distortion is more damaging to your
ears than listening to an undistorted system at the 6.5 volume level. The threshold of pain
is always an indicator that the sound level is too loud and may permanently damage your
hearing. Please use common sense when controlling volume!
When jump starting the vehicle, be sure that connections made with jumper cables are correct.
Improper connections can result in blown amplier fuses as well as the failure of other critical
systems in the vehicle.
TROUBLESHOOTING