jl audio 300/4 repair

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This is a common problem with this amp.One or two IRF540 on channel which has DC voltage shorted.Also check gate resistors.If it not going to help.Look on LED lights on driver boards.If the channel working properly all lights will be on.If it not, check two zeners diodes on bottom of the driver board.They have SOT-23 case and marked 6,8 Y
 
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