Troubleshooting
Symptom
Amplifier Will Not Power
Up
Protection LED Comes On
No Output
Low Output
High Hiss in Speakers
Distorted Sound
Amplifier Gets Very Hot
Possible Remedy
Check to make sure you have a good ground connection.
Check that there is a battery power on the (+) terminal.
Check all fuses, replace if necessary.
Make sure that the protection LED is not illuminated.
Check for short circuits on speaker leads.
Check that the speaker load is not beyond the minimum load.
Remove speaker lead and reset the amplifier. If the protection LED
still comes on, then see your Authorized ALLIANCE Audio
dealer.
Check that the RCA audio cables are plugged into the proper
inputs.
Check all speaker wiring.
Check the head unit output and the amplifier level setting.
Reset the level control.
Check the crossover control settings.
Check the RCA cable is not shorted to power ground at amplifier
side.
Check the amplifier grounding.
Check that the input level control is set to match the signal level
of the head unit.
Always try to set the input level as low as possible.
Check that all crossover frequencies are properly set.
Check for short circuits on the speaker leads.
Check that the minimum load impedance for the amplifier is
correct.
Check that there is good air circulation around the amplifier.
In some cases, adding an external cooling fan may be necessary.
Do not mount the amplifier upside down.
3
2
VL1500D
POWER
PROTECT
+12V REM GND
POWER INPUT
SPEAKER OUTPUT
MONO
