Momentum MMA 300 - Manual (Page 14)

TROUBLE SHOOTING GUIDE
Before you power up the system for the first time, please check that all your connections are tight and seated properly. Use a
volt meter to check that all equipment is receiving 12Volts and that all grounds are good. Check to make sure that all
switches and push buttons are in their proper position.
If the amplifier power LED does not light, disconnect all the speakers and RCA connections. Turn the amplifier on again. If the
LED still does not light-make sure that the amp is getting power/ground and remote signal by testing these connections with a
volt meter.
If the power LED does light, then reconnect the RCA cables one at a time. If the Diagnostic LED goes on at this point-then you
know there is either a short in the RCA cable or the head unit is sending DC voltage into the amplifier. If the power LED stays on
at the Diagnostic LED does not light, begin to reinstall the speakers-one at a time. If the Diagnostic LED lights when installing a
particular speaker-that particular speaker must be shorted or the speaker wire may be shorted, replace the speaker and/or
the wire.
Diagnosing Noise in your system can be tricky, first thing to do is to disconnect the RCA cables, if there is still noise-make sure
your ground connection is to a real ground location of the vehicle. If the noise stops when you disconnect the RCA cables
that means that the noise is originating from a source other than the amplifier. Possible reasons could include a ground loop,
or badly ground head unit, equalizer or electronic crossover. Faulty alternator, old car battery, worn ignition wires, or bad
power connection at the battery and/or alternator.
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