crescendo Evolution Seven 7A2, Instruction Manual

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TROUBLESHOOTING
NO SYMPTOM SOLUTION
01 Amplifier fails to turn on a. Check ground wiring at the amplifier and at the
battery.
b. Check battery condition and battery wiring.
c. Check all fuses.
d. If the ‘Fault Indicator LED’ is flashing, refer to the
next troubleshooting guide
02 Fault indicator LED flashing a. Check for short circuit on speaker leads.
b. Make sure that speaker load is not below
amplifier minimum load (4 Ohm bridged for
7A2).
c. If LED still flashes when speaker is not connected,
then the amplifier needs to be repaired
03 No sound output a. Check RCA output of the source unit and the gain
setting at the amplifier.
b. Check RCA cables.
c. Check speaker cables and termination.
04 Low sound output a. Set the gain sensitivity.
b. Check the crossover settings.
05 High hissing noise a. Make sure RCA cable is not shorted to the
Ground or body of the amplifier.
b. Check the Grounding of amplifier and source
unit.
06 Sound is distorted a. Make sure that gain control is properly adjusted
to match signal output level of the source unit.
Tips: do not set the gain control higher than it
should be.
b. Check all frequency settings on the crossover
section.
c. Check for short from the speaker leads to the car
body.
07 Amplifier builds a lot of heat a. Make sure that speaker load is not below
amplifier minimum load (4 Ohm bridged for
7A2).
b. Make sure that amplifier have a good air
circulation. Add an external cooling fan if
necessary.
Contact our authorized dealer for assistance if problem still persist or it is not covered on the
above troubleshooting guide.