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jl audio 300/4 repair
jl audio 300/4 repair
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Old 12th June 2009, 06:27 PM   #1
brianfulcher15 is offline brianfulcher15  United States
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Join Date: Jun 2009
Default jl audio 300/4 repair

Hey guys I have a jl audio 300/4 that has messed up. It wont play out one speaker chanel, and it fried the speaker that was hooked into that chanel. Can any one point me in the right direction to find some info on repairing this. Thanks

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Old 13th June 2009, 06:01 PM   #2
Fuzzymuff is offline Fuzzymuff  United Kingdom
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Join Date: Mar 2009
Default Elaborate please

Whats all messed up? You burnt anything? Is the wire a mess, pcb?
Why is a channel gone? Have you checked Output Transistors?

Have you searched?

Banging my head against some mad bvgger's wall!

Wrap it in foil, and plug it in.
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Old 15th June 2009, 10:53 PM   #3
jol50 is offline jol50  United States
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With no speakers or input and amp on, see if you have DC voltage on that channel and see what others are. They should be near 0v.
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Old 16th June 2009, 05:45 AM   #4
Dimon74 is offline Dimon74  United States
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Join Date: Feb 2008
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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