jl audio 300/4 repair

brianfulcher15 · 12th June 2009, 06:27 PM

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

Brian

Fuzzymuff · 13th June 2009, 06:01 PM

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!

Fuzzymuff

jol50 · 15th June 2009, 10:53 PM

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.

Dimon74 · 16th June 2009, 05:45 AM

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

12th June 2009, 06:27 PM	#1
brianfulcher15 diyAudio Member Join Date: Jun 2009	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 Brian

13th June 2009, 06:01 PM	#2
Fuzzymuff diyAudio Member Join Date: Mar 2009	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! Fuzzymuff __________________ Wrap it in foil, and plug it in.

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15th June 2009, 10:53 PM	#3
jol50 diyAudio Member Join Date: Nov 2007	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.

16th June 2009, 05:45 AM	#4
Dimon74 diyAudio Member 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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