Question about Lanzar 2H 1000W MOSFET AMP Car Audio Amplifier

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Car Amplifier My amp is 2000watts, with a 500watt sub and 260watt 6x9s attached, it was working for about half a year then suddenly stopped, ive replaced the fuses and disattached then reattached all the wires and it still wont work, it gets power to it but istead of the green light coming on a red light does??

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Check the power transistors which usually have their cases screwed to the main heatsink/body of the amp case. They are usually large black cases with 3 legs soldered to the main board.
If any of them are shorted out inside the amp will go in to protection mode. you can test them in the circuit but it's best if you can detatch at least 2 of the legs when testing. If you don't understand the meter readings for transistors you can test them with a continuity tester which will bleep if the transistor is shorted inside.
First put the two probes from the meter on to the first 2 legs, if it bleeps it's probably shorted in side, if it does'nt that junction of the transistor is probably ok.
Then try leg 2 and 3 and the same for leg 1 and 3.
If all 3 legs bleep which ever way round you do it, the transistor will need replacing.
Depending on the power of the amp there are 8 large transistors, 4 for each channel.
Good luck with it.

Posted on Mar 17, 2008

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