Question about Crossfire VR402 Car Audio Amplifier

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Green LED comes on then fades out

When I power on my amp the green LED lights up then dims and no sound comes from the speakers. The light will come back on and I will here a faint pop from the speakers like the amp wants to work, then the light will dim out again, and this will continue until I power down the amp. What is the problem and how can I fix it?

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This is common when the output transistors have failed. The amp powers up and the amp senses a problem and goes into protection mode. Generally, there is a protection LED but not all amps have them. To be sure that the problem is not installation related, check the DC voltage across B+ and ground when the amp tries to power up. If the voltage remains above 11 volts, the problem is almost certainly due to a failed component in the amplifier. Disconnect the signal lines and all speakers (disconnect the wires from the amp terminals) and try to power it up. If it powers up, you could have a defective speaker or defective wiring. If the amp still fails to power up, the amp should be checked by a qualified tech.

Posted on Sep 16, 2007


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